Instruction Sheet For JIMS Stroker Flywheels
Contents
1. From the Track To the Street 555 Dawson Drive Camarillo CA 93012 Phone 805 482 6913 Fax 805 482 7422 www jimsusa com CAUTION Wear safety glasses Excessive force may damage parts See JIMS catalog for over 100 other top quality professional tools The last tools you will ever need to buy 1 Instruction Sheet For JIMS Stroker Flywheels Rev D 10 04 No 1900 IS CAUTION Wear safety glasses Excessive force may damage parts See JIMS catalog for over 100 other top quality professional tools The last tools you will ever need to buy 1 2 5 3 4 5 6 7 8 9 10 11 12 13 14 15 PARTS LIST FOR CARBURETED MODELS No Qty Description Part No 1 1 FLYWHEEL PINION SIDE See Pg 5 2 1 FLYWHEEL SPROCKET SIDE See Pg 5 3 1 ROD MALE See Pg 6 4 1 ROD FEMALE See Pg 6 5 1 CRANK PIN NUT Pack of 2 23969 83 6 1 CRANK PIN 23961 80A2 7 1 PISTON SET RINGS PINS LOCKS See Catalog 8 1 KEY CRANK 2186 9 2 KEY PINION 2187 10 1 KEY SPROCKET 2489 11 1 NUT SPROCKET 24017 80 12 1 NUT PINION 24016 80 13 1 PINION SHAFT 2437 14 1 SPROCKET SHAFT 23909 80 15 1 ROLLERS WITH RETAINERS 3999 16 1 INSTRUCTION SHEET 1900 IS JIMS Part No Description No 1276 Wrist Pin Remover Installer No 1047TP Crank Assembly Removing Tool No 1048 Hard Cap No 39361 69 Motor Sprocket Seal Installer Tool No 17102. Snap Ring Installer and Removal Tool No 1133 Racthing Snap Ring Pliers No 1746 Timken Bearing Simulator No 97225 55 Sprocket Shaft Bearing Installation Tool No 1709 Timken Bearing Remover Tool No 1034 Sprocket Shaft Holder No 1006T Engine Stand No 1236 Piston Ring Compressor Tool No 1068 Tune A Cam for degreeing breather valve amp crankshaft endplay Recommended Tools JIMS has provided you with detailed information listing the applications and specifications of each JIMS Stroker kit applicable to this instruction sheet Please refer to this information throughout your installation for critical component combinations and specifications Do not attempt to install your Stroker kit without cross checking each component for compatibility Charts and Specifications These kits are shipped with standard length sprocket and pinion shafts These kits can be installed into 1984 1999 cases with standard pinion shaft races 24599 58B 24599 58A etc 24628 87 pinion bearings may also be used For 3 5 8 bore pistons motor cases will have to be bored to install 3 5 8 cylinders For 1990 99 motors use JIMS pinion gear No 24043 78 JIMS oil pump drive gear No 26349 84 With JIMS keys 2480 and JIMS nut 24023 54 Evolution Stroker Flywheel Assembly Kits EVO Stroker Kit Charts Page 2 gt From the Track To the Street 555 Dawson Drive Camarillo CA 93012 Phone 805 482 6913 F
3. 4 4 1 4 107 4 4 3 8 110 4 4 1 2 113 4 1 8 4 107 Bore Stroke Inches 4 1 8 4 1 8 110 4 1 8 4 1 4 114 4 1 8 4 3 8 117 4 1 8 4 1 2 120 4 1 4 4 113 4 1 4 4 1 8 117 4 1 4 4 1 4 120 4 1 4 4 3 8 124 4 1 4 4 1 2 128 4 3 8 4 120 4 3 8 4 1 8 124 4 3 8 4 1 4 128 Bore Stroke Inches 4 3 8 4 3 8 132 4 3 8 4 1 2 135 4 1 2 4 127 4 1 2 4 1 8 131 4 1 2 4 1 4 135 4 1 2 4 3 8 139 4 1 2 4 1 2 143 Cubic Inches Bore x Bore x Stroke x 7854 x 2 Cubic Inches From the Track To the Street 555 Dawson Drive Camarillo CA 93012 Phone 805 482 6913 Fax 805 482 7422 www jimsusa com Note The engine builder still has the responsibility of checking and confirming all operating clearances when installing any JIMS parts 6 Instruction Sheet For JIMS Stroker Flywheels Rev D 10 04 No 1900 IS No 4000A Use on Big Twin 1981 99 single cam that uses a 792 size wrist
4. Material Aerodynamic Wheels amp Oiling Grooves Compression Ratio Approximate From the Track To the Street 555 Dawson Drive Camarillo CA 93012 Phone 805 482 6913 Fax 805 482 7422 www jimsusa com Note The engine builder still has the responsibility of checking and confirming all operating clearances when installing any JIMS parts 4 Instruction Sheet For JIMS Stroker Flywheels Rev D 10 04 No 1900 IS 4 5 8 Big Twin Stroker Flywheel Assemblies Without pistons Part No Application Stroke Bore Flywheel Dia Compression Ratio No 1900RLA Use on Shovelhead 1970 84 4 5 8 N A 8 1 2 N A Use on EVO 1984 1999 SHOVELHEAD STROKER FLYWHEEL ASSEMBLY KITS Build from 80 to 106 Shovelhead engine with JIMS new flywheel Assemblies Use on all Shovelhead engines from 1970 to 1984 Each assembly comes pre assembled and pre balanced between 52 60 depending on the weight of the piston installed JIMS performance H beam forged connection rods forged flywheels New JIMS pinion and sprocket shafts and JIMS 2 hole crankpins 4 1 2 Big Twin Stroker Flywheel Assemblies Without pistons Part No Application Stroke Bore Flywheel Dia Compression Ratio No 1915RLA Use on Shovelhead 1970 84 4 1 2 N A 8 1 2 N A Use on EVO 1984 1999 Rebuildable Flywheel Assembly Nuts Square To 0002 4340 Chromoly Material Aerodynamic Wheels amp Oiling Gr
5. a The crank pin nut will probably hit the inside of the right side crankcase cam side at the machined portion above cam hole when stroke is 4 1 2 or longer For this reason adequate clearance is necessary JIMS recommends checking all cases regardless of stroke See picture 3 PIC 1 WARNING Note Read all instructions before performing work Prior to installation of this kit please read and follow the procedures and safety precautions to reduce the risk of per sonal injury Refer to H D Service Manual for specifications and for removal and installation of the engine Read instructions com pletely so you understand before performing any steps Always disconnect battery cables to prevent injury Your work place should be clean and well lit wear safety glasses and protective clothing when working around power tools and compressed air Be careful with chemicals when cleaning parts Protect you skin from solvents and use only in a well ventilated area Degreasers are flammable and are a fire hazard Just use common sense exercise good judgment This kit is basically easy to install but does require some special tools Use authorized H D Service Manual for reference If you are not sure about the procedures in these instructions have a reputable H D repair shop perform those procedures for you PIC 3 Pre Installation Information CAUTION Wear safety glasses Excessive force may damage parts See JIMS catalog for over 100
6. further course of action A part suspected of being defective must not be replaced by a Dealer without prior authorization from JIMS If it is deemed necessary for JIMS to make an evaluation to deter mine whether the part is defective it must be packaged properly to prevent further damage and be returned pre paid to JIMS with a copy of the original invoice of purchase and a detailed letter outlining the nature of the prob lem how the part was used and the circumstances at the time of failure If after an evaluation has been made by JIMS and the part was found to be defective repair replacement or credit will be granted ADDITIONAL WARRANTY PROVISIONS 1 JIMS shall have no obligation in the event a JIMS part is modified by any other person or organiza tion 2 JIMS shall have no obligation if a JIMS part becomes defective in whole or in part as a result of improper installation improper maintenance improper use abnormal operation or any other misuse or mistreat ment of the part 3 JIMS shall not be liable for any consequential or incidental damages resulting from the failure of a JIMS part the breach of any warranties the failure to deliver delay in delivery delivery in noncon form ing condition or for any other breach of contract or duty between JIMS and a customer 4 JIMS parts are designed exclusively for use in Harley Davidson motorcycles JIMS shall have no war ranty or liability obligation if a JIMS
7. other top quality professional tools The last tools you will ever need to buy Instruction Sheet For JIMS Stroker Flywheels Rev D 10 04 No 1900 IS 8 From the Track To the Street 555 Dawson Drive Camarillo CA 93012 Phone 805 482 6913 Fax 805 482 7422 www jimsusa com Note The engine builder still has the responsibility of checking and confirming all operating clearances when installing any JIMS parts b Measure from the outside edge of pinion race to the edge of machined area to a distance of 2 300 or less Remove just enough material to make clearance Note 2 300 is adequate for strokes up to 5 c Mock up right flywheel in crankcase half with pinion shaft and crank pin installed with pinion bearing washers etc Before installing mock up mark area to be clearanced with marker pin or layout fluid such as dykum blue d To clearance case start by scribing an arc using dividers Cover all areas where metal chips could get into before grinding Metal removal can be done with a hand grinder die grinder etc Keep checking clearance during the grind ing procedure Remember remove just enough material to make proper clearance A minimum of 060 clearance is required 4 CONNECTING ROD TO CASE CLEARANCE To accurately judge the necessary rod to case clearancing JIMS suggest mocking at least half the flywheel assembly into the left side case by uising JIMS No 1745 Timken Bearing Simulator If
8. part is used in any other application 5 Any parts which have been replaced for any reason become the property of JIMS and will not be returned under any circumstances
9. pin Note Fits Aftermarket and S amp S motors 7 440 from center to center No 4000B Use on Big Twin 1981 99 single cam that uses a 927 size wrist pin Note Fits Aftermarket and S amp S motors 7 440 from center to center JIMS CONNECTING RODS PRODUCED FROM FORGED 4340 AEROSPACE QUALITY STEEL Connecting rods at their finest The JIMS research and development team looked into all other rods on the market to see which areas needed improvement JIMS connecting rods start out as forged aerospace quality 4340 Chromoly steel blanks then the rods are CNC machined on the newest high tech mills available Each rod is heat treated magnafluxed shot peened and completely inspected with a hardness test for each rod From there each rod goes back into the CNC mill to bore the rod race bores to the wrist pin bushing bores to within 0003 of each other at a 32 bore finish for the best possible bushing and race adhesion The wrist pin bushing oiling hole has been optimized for better lubrication of wrist pins and an increase in the strength JIMS chooses H Beam rods for stability and strength for both drag racing and any street application over the standard I beam rods Although we realize that H beam rods are very difficult and time consuming to manufacture JIMS believe that it is well worth the extra effort Each rod set has JIMS rod races and wrist pin bushings installed and are fit to
10. you are working with flywheel and rods that are not assembled mock up the left side flywheel in to the case with the sprocket shaft crank pin bearings and washers in place a With flywheel assembly simulated in left case install pistons without rings and place both cylinders and pistons on left case with 2 nuts Note Some JIMS piston sets are direction al Please align engraved arrow on piston deck to the intake valve unless expressed otherwise but only after pistons have been fit to each cylinder If using pistons other than JIMS consult piston manufacturer s installation instructions for proper alignment B Rotate flywheels slowly first clockwise see picture 4 With felt pen mark the point of contact that rod makes at case note if rod makes contact with cylinder spigot first mark point of contact of rod to spigot with felt pen Grind and file cylinder for a minimum of 100 025 rod clearance Caution When grinding and filing cylinder you must maintain as smooth of a finish as possible without making sharp corners C Rotate flywheels counter clockwise see pic 5 With felt pen mark the point of contact that rod makes at case With a straight edge mark a line from point of rod contact to the other point of rod contact With your calipers set at 100 mark a line to the outside of the first line D This is the area you will be removing for rod clearance Do the front rod clearance the same way Caution r
11. 24703 54B with oil pump drive gear No 26349 84 96 Evolution Fuel Injected Stroker Kits Part No Application Stroke Bore Flywheel Dia Compression Ratio No 1929 Use on EVO F I 1995 1999 4 5 8 3 5 8 STD 8 1 2 9 75 1 No 1930 Use on EVO F I 1995 1999 4 5 8 3 5 8 005 8 1 2 9 75 1 No 1931 Use on EVO F I 1995 1999 4 5 8 3 5 8 010 8 1 2 9 75 1 89 Evolution Fuel Injected Stroker Kits Part No Application Stroke Bore Flywheel Dia Compression Ratio No 1926 Use on EVO F I 1995 1999 4 5 8 3 1 2 STD 8 1 2 9 25 1 No 1927 Use on EVO F I 1995 1999 4 5 8 3 1 2 005 8 1 2 9 25 1 No 1928 Use on EVO F I 1995 1999 4 5 8 3 1 2 010 8 1 2 9 25 1 87 Evolution Fuel Injected Stroker Kits Part No Application Stroke Bore Flywheel Dia Compression Ratio No 1920 Use on EVO F I 1995 1999 4 1 2 3 1 2 STD 8 1 2 10 1 No 1921 Use on EVO F I 1995 1999 4 1 2 3 1 2 005 8 1 2 10 1 No 1922 Use on EVO F I 1995 1999 4 1 2 3 1 2 010 8 1 2 10 1 EVO FUEL INJECTED STROKER FLYWHEEL ASSEMBLY KITS IMPORTANT NOTE The stock electronic control module will need to be replaced with an upgraded programmable control module for EFI stroker flywheels Refer to local dealer or distributor Forged Material Rebuildable Flywheel Assembly F I Notching Nuts Square to 0002 4340 Chromoly
12. 4 5 8 3 1 2 005 8 1 2 9 25 1 No 1900A10 Use on EVO 1984 1999 4 5 8 3 1 2 010 8 1 2 9 25 1 87 Evolution Stroker Kits Part No Application Stroke Bore Flywheel Dia Compression Ratio No 1900C Use on EVO 1984 1999 4 1 2 3 1 2 STD 8 1 2 10 1 No 1900C5 Use on EVO 1984 1999 4 1 2 3 1 2 005 8 1 2 10 1 No 1900C10 Use on EVO 1984 1999 4 1 2 3 1 2 010 8 1 2 10 1 Compression Ratio Approximate From the Track To the Street 555 Dawson Drive Camarillo CA 93012 Phone 805 482 6913 Fax 805 482 7422 www jimsusa com Note The engine builder still has the responsibility of checking and confirming all operating clearances when installing any JIMS parts 3 Instruction Sheet For JIMS Stroker Flywheels Rev D 10 04 No 1900 IS Each assembly comes pre assembled and pre balanced at 60 with JIMS precision pistons JIMS performance H beam forged connection rods forged flywheels New JIMS pinion and sprocket shafts and JIMS 2 hole crankpins These flywheels will install into a stock 1995 99 H D Evo EFI cases with minor modification to the motor case To use the 3 5 8 piston flywheel kits you will need to bore your motor case for the 3 5 8 cylinders For these flywheel assemblies you will need to use JIMS pinion gear No 24043 78 as a starting point for cam to gear fit also use JIMS pinion gear spacer No
13. Harley Davidson fac tory specifications JIMS H beam rods are available in several different lengths of centerline dimensions includ ing 7 440 7 690 and 7 960 No 4000 Use on 1941 99 Big Twin O H V For use on pre 1973 use a qualified piston for 7 440 length rods with a standard 792 wrist pin bushing No 4003 Use on 1941 99 Big Twin single cam special application 7 440 length with 927 wrist pin bushing No 4004 Use on 1941 99 Big Twin single cam special application 7 690 length with a 791 wrist pin bushing No 4005 Use on 1941 99 Big Twin single cam special application 7 690 length with a 925 wrist pin bushing No 4006 Use on 1941 99 Big Twin single cam special application 7 960 length with a 791 wrist pin bushing No 4007 Use on 1941 99 Big Twin single cam special application 7 960 length with a 925 wrist pin bushing No 4008 Use on 1941 99 Big Twin single cam special application 8 250 length with a 925 wrist pin bushing ROD ASSEMBLIES Rods fit to H D factory specification Crank Pin No 23961 802 Crank Pin nuts No 23969 83 Crank Pin key No 2187 Crank Pin rollers with retainers No 3999 From the Track To the Street 555 Dawson Drive Camarillo CA 93012 Phone 805 482 6913 Fax 805 482 7422 www jimsusa com Note The engine builder still has the responsibility of checking and confirming all operating clearances when install
14. METER JIMS is proud to introduce improved Big Twin flywheels These flywheels are not just a copycat flywheel with a different stroke but a flywheel redesigned and engineered for today s and future Harley Davidson Motorcycles JIMS Big Twin flywheels are manufactured from the finest American 4140 forged steel blanks ideal for precision machining and product integrity JIMS flywheels feature a machined in windage groove with angled counter weights to divert oil The oil that would normally adhere to the flywheel surface is now deflected into JIMS windage groove and rolled outward to the scavenge port of any Big Twin case making JIMS flywheels the most aerodynamic on the market today JIMS aerodynamic windage flywheel will reduce the amount of oil drag on the flywheel returning some of the free horsepower to your engine At the same time JIMS windage flywheel will remove the oil from the flywheels at a faster rate to aid in cooling the engine s internal parts Included in this breakthrough design is a deflection windage device when used with JIMS rods to help lubricate and cool the bottom side of both pistons To further help in rod strength and lubrication we have designed three grooves around both crankpin thrust faces into the JIMS flywheels With grooves machined into the flywheel thrust faces we have eliminated the four grooves that are ground into the rod itself When grooves are ground into the rod it
15. ax 805 482 7422 www jimsusa com Note The engine builder still has the responsibility of checking and confirming all operating clearances when installing any JIMS parts 2 Instruction Sheet For JIMS Stroker Flywheels Rev D 10 04 No 1900 IS 106 Evolution Stroker Kits Part No Application Stroke Bore Flywheel Dia Compression Ratio No 1910E Use on EVO 1984 1999 4 5 8 3 13 16 STD 8 1 2 10 1 No 1910E5 Use on EVO 1984 1999 4 5 8 3 13 16 005 8 1 2 10 1 No 1910E10 Use on EVO 1984 1999 4 5 8 3 13 16 010 8 1 2 10 1 96 Evolution Stroker Kits Part No Application Stroke Bore Flywheel Dia Compression Ratio No 1910A Use on EVO 1984 1999 4 5 8 3 5 8 STD 8 1 2 9 75 1 No 1910A5 Use on EVO 1984 1999 45 8 3 5 8 005 8 1 2 9 75 1 No 1910A10 Use on EVO 1984 1999 4 5 8 3 5 8 010 8 1 2 9 75 1 80 Evolution Stroker Kits Part No Application Stroke Bore Flywheel Dia Compression Ratio No 1900B Use on EVO 1984 1999 4 1 4 3 1 2 STD 8 1 2 10 1 No 1900B5 Use on EVO 1984 1999 4 1 4 3 1 2 005 8 1 2 10 1 No 1900B10 Use on EVO 1984 1999 4 1 4 3 1 2 010 8 1 2 10 1 89 Evolution Stroker Kits Part No Application Stroke Bore Flywheel Dia Compression Ratio No 1900A Use on EVO 1984 1999 4 5 8 3 1 2 STD 8 1 2 9 25 1 No 1900A5 Use on EVO 1984 1999
16. emove fly wheel assembly and cover to keep out all chips and also mask off Timken bearing bore of left case E After you have rechecked clearance of the left case and cylinder spigots remove cylinders pistons and flywheels from left case F Mark and remove material from right case to match left case Caution Before you remove material from right case mask off both sides of cam bearing and pinion race G Recheck your clearance for right case by installing flywheels both cylinders and pistons 5 PISTON TO PISTON AND PISTON SKIRT TO PIC 4 PIC 5 FLYWHEEL CLEARANCE a With the flywheel assembly mocked up in left case only install cylinders and pistons no rings on the pistons Make sure they are installed properly The beveled cut away on the cylinder base points towards the center of the engine Securely install the cylinders with 2 nuts on each cylinder Rotate flywheel assembly slowly until pistons make contact with each other see pic 6 b Disassemble and clearance these areas making the clear ance on the rear piston A minimum of 100 clearance is required remove only enough to make the clearance After piston to piston clearance is performed rotate flywheel and check piston to flywheel clearance Remove piston and clearance skirt 100 minimum is required See picture 7 6 PISTON DECK HEIGHT a With flywheel assembly mocked up in left case install base gaskets pistons no rings or wrist pin clips and c
17. ing any JIMS parts 7 Instruction Sheet For JIMS Stroker Flywheels Rev D 10 04 No 1900 IS 1 Follow instructions in H D Service Manual for removal of engine 2 With engine removed from frame and sitting on the work bench follow the disassembly instructions in the service manual to dis assemble engine 3 Clean all parts thoroughly be sure to clean all gasket surfaces Inspect all parts for visible damage Measure all parts for wear using the service wear limit section in the H D Service Manual Replace any worn or damaged parts with JIMS engine parts or equivalent Installation Instructions 1 CHECK CYLINDER STUDS AND DECK SURFACES Clean cases and assemble without flywheels Check cylinder base gasket surface Use a straight edge across the deck See picture 1 If any mis alignment is present the surface must be milled Remove the cylinder studs and cover all areas where chips could get in Take off just enough to clean up surface Check all cylinder studs and stud threaded holes If threads are damaged use JIMS tool No 1000A to repair JIMS suggests to use the latest cylinder studs available from Harley Davidson No 16837 95C Follow instructions in H D Service Manual for proper installation of studs 2 PISTON CLEARANCE The pistons in this kit need to be fitted to the cylinders using the specifica tions provided See piston instructions included with your pistons 3 CRANK PIN TO CRANKCASE CLEARANCE
18. l start up excessive heat build up can occur Do not over heat by revving engine or running at a fast idle too long To ensure proper head gasket seal upon first time engine start up idle engine 1000 1500 R P M until cylinder head tem perature reaches about 250 degrees Shut engine off and let cool This procedure is necessary to properly seal top end com ponents CAUTION Improper initial engine start up may cause head gaskets to fail prematurely Because most engine damage could occur during the first 50 miles keep the heat down by not exceeding 2800 R P M but do not lug engine Continue to vary speed for the next 500 miles and do not exceed 3800 R P M For the balance of the first 1000 miles avoid overheating engine Do not lug engine or idle for long periods of time No trailer towing racing etc Change oil and filter after the first 500 miles WARRANTY All JIMS parts are guaranteed to the original purchaser to be free of manufacturing defects in materials and work manship for a period of 6 six months from the date of purchase Merchandise that fails to conform to these con ditions will be repaired or replaced at JIMS option if the parts are returned to us by the purchaser within the 6 six month warranty period or within 10 ten days thereafter In the event warranty service is required the orig inal purchaser must call or write JIMS immediately with the problem Some problems can be rectified by a tele phone call and need no
19. ooves 4 3 4 Big Twin Stroker Flywheel Assemblies Without pistons Part No Application Stroke Bore Flywheel Dia Compression Ratio No 1917RLA Use on Shovelhead 1970 84 4 3 4 N A 8 1 2 N A Use on EVO 1984 1999 Stroker Flywheel Assemblies Only For Strokes longer than 4 1 4 the engine builder must supply the pistons for the stroke you will be building To maintain a balance factor of 60 both pistons with rings pins and clips should weigh between 906 grams and 938 grams To maintain a balance factor of 56 both pistons with rings pins and clips should weigh between 1021 grams and 1051 grams To maintain a balance factor of 52 both pistons with rings pins and clips should weigh between 1136 grams and 1166 grams 4 1 4 Big Twin Stroker Flywheel Assemblies Without pistons Part No Application Stroke Bore Flywheel Dia Compression Ratio No 1913RLA Use on Shovelhead 1970 84 4 1 4 N A 8 1 2 N A Use on EVO 1984 1999 From the Track To the Street 555 Dawson Drive Camarillo CA 93012 Phone 805 482 6913 Fax 805 482 7422 www jimsusa com Note The engine builder still has the responsibility of checking and confirming all operating clearances when installing any JIMS parts 5 Instruction Sheet For JIMS Stroker Flywheels Rev D 10 04 No 1900 IS JIMS FLYWHEELS 4 1 4 4 1 2 4 5 8 4 3 4 STROKE 8 1 4 amp 8 1 2 DIA
20. self the rods become susceptible to cracking CNC machining of JIMS Flywheels allows us to control taper to taper and taper to outside diameter centerline to within 0003 making these flywheels the easiest to true balance and build No 1900RL Use on 1958 99 Big Twin single cam motors 4 5 8 Stroke x 8 1 2 O D No 1901RL Use on 1958 99 Big Twin single cam motors 4 5 8 Stroke x 8 1 4 O D No 1913RL Use on 1958 99 Big Twin single cam motors 4 1 4 Stroke x 8 1 2 O D No 1914RL Use on 1958 99 Big Twin single cam motors 4 1 4 Stroke x 8 1 4 O D No 1915RL Use on 1958 99 Big Twin single cam motors 4 1 2 Stroke x 8 1 2 O D No 1916RL Use on 1958 99 Big Twin single cam motors 4 1 2 Stroke x 8 1 4 O D No 1917RL Use on 1958 99 Big Twin single cam motors 4 3 4 Stroke x 8 1 2 O D No 1918RL Use on 1958 99 Big Twin single cam motors 4 3 4 Stroke x 8 1 4 O D For example On 1958 application Use JIMS pinion shaft No 24006 80 83 Cam cover set up for end oiling JIMS crank pin No 23961 802 and sprocket shaft No 24001 56 80 Bore Stroke Inches 3 1 2 4 1 4 80 3 1 2 4 1 2 87 3 1 2 4 5 8 89 3 1 2 4 3 4 92 3 5 8 4 1 4 88 3 13 16 4 1 4 100 4 4 101 4 4 1 8 104
21. top of the head gasket 7 BREATHER TIMING JIMS recommends checking the breather timing on all engines regardless of the stroke Optimized breather timing will maximize performance This procedure requires a degree wheel Use JIMS No 1068 Degree Wheel Kit When modifying the breather hole in the case make sure the breather hole in the case is located in the same position as the hole in the breather See picture 8 Catuion Before doing any grinding mask off and cover all areas to keep out foreign material Grind the case breather opening to the specifications below Opening 0 degrees TDC 10 degrees with minimum being 10 degrees before top dead center and maxi mum being 10 degrees after top dead center Closing 65 degrees ABDC 10 degrees with minimum being 55 degrees after bottom dead center and with maximum being 75 degrees after bottom dead center PIC 6 PIC 7 PIC 8 Instruction Sheet For JIMS Stroker Flywheels Rev D 10 04 No 1900 IS 10 From the Track To the Street 555 Dawson Drive Camarillo CA 93012 Phone 805 482 6913 Fax 805 482 7422 www jimsusa com Note The engine builder still has the responsibility of checking and confirming all operating clearances when installing any JIMS parts BREAK IN PROCEDURE After final assembly the engine must be broken in Over revving or lugging the engine could cause damage to pistons and or other engine components On the initia
22. ylinders Secure to cylinders using short head bolts tighten to slight ly more than hand tight 2 3 ft lbs b Rotate flywheel assembly so that the front piston is at its highest point of travel TDC c Using a straight edge laying across the bore diameter mea From the Track To the Street 555 Dawson Drive Camarillo CA 93012 Phone 805 482 6913 Fax 805 482 7422 www jimsusa com Note The engine builder still has the responsibility of checking and confirming all operating clearances when installing any JIMS parts 9 Instruction Sheet For JIMS Stroker Flywheels Rev D 10 04 No 1900 IS sure using a feeler guage the distance from the piston top to the cylinder head gasket surface Note If the piston is higher than the gasket surface this is referred to as Positive Deck Height if the piston is below the head gasket sur face this is referred to as Negative Deck Height Note this measurement d Now measure the thickness of your head gasket using dial calipers or a micrometer and subtract your deck height measurement from your head gasket thickness You must have a minimum of 043 clearance between your piston top and the top of the head gasket when it is installed on the cylinder If you have too little deck height less than 043 you can adjust this by using a thicker base or head gasket Remember optimal range for a performance orien tated street motor is 043 to 060 of deck below the
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