Manual
Contents
1. replace glow plug Glow plug does not work check the condition of the glow plug properly check the glow plug igniter Engine is set too rich check carburetor settings repeat tuning too much fuel hits back procedure unscrew the glow plug completely and use startbox for 5sec Engine is too lean check carburetor setting repeat tuning procedure too little fuel does not start Engine doesn t suck in the fuel check the fuel line for possible damage check the carburetor setting Engine stops after a Glow plug defective replace glow plug short time after glow Bad fuel replace fuel by fresh and correct type of fuel ug Du Pi been Bad carburetor setting check the carburetor setting repeat tuning isconnecte procedure Performance Engine is set too lean check the carburetor setting repeat tuning decreases after procedure reaching operating Glow plug defective or wron replace the glow plug by a correct type temperature or engine type pug g P ln me stalls from time to time Engine runs too hot run in process is not completed Shims under comb chamber check number of shims wrong Engine still keeps Bad carburetor setting open mid range needle 1 4 turn at a time and running at high RPM re adjust idle speed for a moment when set idle speed lower you release the throttle Glow plug wrong type too hot use glow plug with higher number e g go from 5 to 6 Shims under comb chamber check number of s2. a high performance and highly sophisticated product which doesn t make any compromise between maximum performance and easy tuneability We hope you enjoy your new engine Please read the following instructions carefully before you start using your LRP ZR 21 X en gine This user guide contains important notes for the installation the safety the use and the maintenance of this product Thus protecting yourself and avoid damages of the product Proceed according to the user guide in order to understand your LRP ZR 21 X engine better Ple ase take your time as you will have much more joy with your product if you know it exactly This user manual shall be kept in a safe place If another customer is using this product this manual has to be handed out together with it 6 HEAD CLEARANCE We recommend a real head clearance between piston and burnroom of about 0 75mm 0 029 or more when the piston is at Top Dead Center The real head clearance can be calculated as follows Real head clearance Thickness of head shims 0 25mm We suggest to start with 0 40mm 0 016 shims underneath the combustion chamber You may want to adjust the shims depending on nitro content see table or track layout Large tracks may require an extra 0 10mm 0 004 shim to reach higher topspeed and improved fuel consumption but this will decrease acceleration slightly Real head clearance 0 65mm 0 025 0 65mm 0 025 0 75mm 0 029 0 85mm 0 033 0
3. top end first 4 Tune mid range needle next 5 Reset idle speed screw Procedure Set the idle speed so your engine doesn t stall slightly higher then normal Go to the track with the main needle set too rich there should be heavy smoke coming from the muffler now Tune the engine by leaning the main needle 1 8 turn at a time turn clockwise Your goal will be that the engine will just reach maximum RPM on the straightaway Open the main needle again by an 1 8 turn turn counter clockwise when you have reached that point This should be the perfect setting for the main needle Temperature of 95 105 C 200 225 F If the main needle is set too lean the engine will overheat and will not accelerate smoothly If this happens immediately stop the engine and richen the main needle counterclock wise 1 4 turn before a new attempt Adjust the mid range needle now Run 3 full laps stop the car near you and let it idle for 5secs Push off It should have slightly richened up idle rpm gets lower but still accelera te quickly If it died before the 5secs check the following If the rpm constantly decreases and finally the engine stops the mid range needle is too rich If the idle speed increases during idle the mid range needle is too lean You may have to re adjust the idle speed now If it idles too high the clutch may not release completely and you will lose snap off the corners If it idles to
4. 40mm 0 016 0 40mm 0 016 0 50mm 0 020 0 60mm 0 024 that s due to the internal construction of the engine and the compression of the head shims when the cooling head is mounted 7 CARBURETOR The factory settings of the engine are as following and are a good starting point for you if you are not satisfied with your carburetor settings Turn in the needles completely Caution Do not overtighten them and loosen them the required number of turns again e Mid range 5 50 turns e Main 6 00 turns Idle screw No 1 Adjusts the air flow when carburetor is fully closed Turn CW for higher idle speed and CCW for lower idle speed Should be open 0 5 1 0mm Mid range needle No 2 Adjusts the mid low speed flow rate of the fuel Turn CW for leaner and CCW for richer setting Main speed needle No 3 Adjusts the main flow rate of the fuel when the throttle is opened significantly Turn CW for leaner and CCW for richer setting Carburetor venturi inserts In order to affect the fuel air mixture you can use different venturi inserts on this carburetor These are to finetune your engine to different track layouts There are three different venturis coming with the engine 7 0mm 8 0mm and 9 0mm 9 0mm has the most power 7 0mm has the best fuel mileage 8 RUN IN Proper run in of the engine is a very important step in ensuring that you get the highest perfor mance and lifetime of your engine T
5. MA00185 LRP electronic GmbH 2008 ORDER rd E X 32110 2 71 HP NITRO ENGINE 35 400 RPM LRP electronic GmbH Wilhelm Enssle Str 132 134 73630 Remshalden German info LRP ELECTRONIC de www LRP cc 1 SPECIFICATION Engine size 21 3 49ccm Exhaust Rear Bore 16 26mm Stroke 16 80mm Liner ABC Number of ports 5 1 5x transfer 1x exhaust port Crankshaft 14 0mm 10 0mm bore SG shaft special Turbo scoops Crankcase LRP XTEC 21 Heavy Duty Competition black coloured Piston Fully CNC machined high silicium alloy Connecting Rod Fork shaped aluminium using double bushings Glowplug Hot Turbo style LRP Turbo 6 No 35160 recommended Carburetor LRP PowerCarb 14SV 2 thermally protected with 7 0 8 0 and 9 0mm changeable venturi inserts lightweight composite aluminium steel design Power Output 2 71 PS Max RPM 35 400 Weight 340g Figures may vary depending on used fuel exhaust system and tuning Never use regular gasoline or airplane fuel Use fresh 2 stroke model car fuel only We recom mend using our line of LRP Energy Power fuels 35710 25 1L 35730 25 3 5L For the LRP ZR 21 X engine we recommend a fuel with 25 nitro Never exceed 36 nitro A higher nitro content will decrease your engine s lifetime 3 AIRFILTER A good airfilter is very important for the life of your engine Never run without an airfilter as quick and permanent damage will result Don t forget to impregnate the airfilter w
6. ake your time for proper run in Do not use run in benches but use your car for run in Use the same fuel as you will be using for the life of the engine Special run in fuel is not needed If your engine doesn t start easily you may try loosen the glow plug by 2 turn to decompress the engine and try again Don t forget to tighten the glow plug again once the engine started Procedure Start the engine and set the main needle very rich i e excessive smoke coming from the muffler Let the engine idle for 2mins first to warm it up Now start driving your car it will be slow and sluggish but this is an important step Do not allow the engine to rev up too high run the engine at half speed on the straightaway The engine should not be too cold and not too hot during run in 70 80 C 160 180 F is per fect Let the engine cool down for 15mins after each tank during the run in period We recommend doing so for 5 tanks of fuel before you start tuning your engine 9 TUNING It never hurts to have the mixture too rich but NEVER let the mixture get too lean Always tune from rich to lean If in doubt richen it up first Never try to tune a cold engine run 2 3 minutes to get the engine up to running temperature before doing any adjustments Basic tuning procedure is as follows 1 Set the engine s idle speed up slightly higher than normal 2 Start tuning your engine with the settings too rich 3 Always tune main speed needle
7. hims wrong REPAIR PROCEDURES LIMITED WARRANTY All products from LRP electronic GmbH hereinafter called LRP are manufactured according to the highest quality standards LRP guarantees this product to be free from defects in materi als or workmanship for 90 days non european countris only from the original date of purchase verified by sales receipt This limited warranty doesn t cover defects which are a result of misuse improper maintenance outside interference or mechanical damage This applies among other things on Engine disassembly by customer Any modification of the engine done by the customer Rust inside the engine Dust or dirt inside the engine Damaged engine due to glow plug failure Overheating Scratches inside the engine caused by dirt or dust Water in fuel Wrong break in procedure Damaged piston due to piston stop devices Damaged cylinder exhaust port due to piston stop devices Breakages at high rpm without engine load To eliminate all other possibilities or improper handling first check all other components in your model and the trouble shooting guide if available before you send in this product for repair If products are sent in for repair which do operate perfectly we have to charge a service fee according to our pricelist With sending in this product the customer has to advise LRP if the product should be repaired in either case If there is neither a warranty nor guarantee claim the inspection
8. ikelbezeichnung BEST NR Artikelbezeichnung 38500 ZR 21 X Crankshaft 38501 ZR 21 X Ball Bearing Front 38502 ZR 21 X Ball Bearing Rear 38503 ZR 21 X Head Shims 8 pcs 38520 ZR 21 X Various Parts Bag 38521 ZR 21 X O Ring Set 38522 ZR 21 X Manifold rubber 3 pcs 38523 ZR 21 X Wrist Pin amp Clips 3 TUNINGTEILE OPTION PARTS BEST NR Artikelbezeichnung BEST NR Artikelbezeichnung 36560 LRP Platinum Iridium Glowplug 6 Turbo Med 36590 LRP Platinum Iridium Glowplug 7 Turbo Med Cold 37910 LRP Platinum Iridium Glowplug 8 Turbo Cold 79920 LRP 1 8 Off Road Competition Spec 2 exhaust system 79925 HiVolt RX Pack 1400 Hump 45000 HiVolt RX Pack 1400 Straight
9. ith a suitable oil before usage Carefully clean the airfilter at least after every tenth tank Replace the airfilter every 3 litres 1 gallon of usage We recommend the use of our LRP Hi Flow 2 Stage airfilter 36560 together with our LRP Hi Flow airfilter oil 36590 4 GLOWPLUG Use only Turbo style glow plugs also known as conical style plugs for this engine We recom mend using our line of high quality LRP Platinum Iridium glowplugs 35160 35180 avai labe as 6 to 8 Check them frequently and never run with worn out or old glow plugs since they could damage your engine They turn dull when your engine was too lean and should be replaced They should stay bright like chrome If the glowplugs wear out too fast an additional 0 1mm shim between burnroom and liner is recommended Whenever you have trouble with the engine stalling for no reason replace the glow plug first TIP Our LRP team always uses a LRP Platinum Iridium 6 35160 plug for the LRP ZR 21 X engine 5 EXHAUST SYSTEM Never run without a pipe since this will cause excessive overheating and may damage your engine A good pipe has a very huge effect on the performance of a 2 stroke engine For the LRP ZR 21 X engine we recommend using our high quality LRP 1 8 Off Road Competition Spec 2 Exhaust System 36210 for maximum performance Dear Customer thank you for your trust in this LRP product By purchasing a LRP nitro engine you have chosen
10. o low it may stall at the start or at the end of the straightaway when you release the throttle Ways to measure the engine temperature e Temperature gauge method recommended Pull in quickly and immediately take a tempera ture reading Place the gauge directly over the engine pointed at the glow plug Spit method Pull in quickly and immediately put some spit on the engine s head The spittle should just slowly boil off 2 3secs It should not dance around as if it were on a hot griddle nor should it lay there and steam 10 AFTER RUN Use after run oil to keep everything lubricated after you have finished your day After run oil helps for an easy start the next time and protects your internals against rust Use only after run oil specially formulated for R C engines Do not use silicone shock oil or similar as they will seriously harm your engine We recommend to use our LRP After Run oil 37910 which you should use regularly after using your engine Procedure First let the tank run completely empty at idle until it runs out of fuel try re starting it several times next put a few drops down the open carburetor and a few drops down the glow plug hole Spin it over for 5 seconds on the starter box and you are done 11 MAINTENANCE Treat your engine with care and check it frequently Due to the extremely high RPM this engine produces any fault can cause serious damage All moving parts inside the engine are subject to wea
11. of the product and the repairs if necessary in either case will be charged with a fee at the customers expense according to our price list A proof of purchase including date of purchase needs to be included Otherwise no warranty can be granted For quick repair and return service add your address and detailed description of the malfunction If LRP no longer manufactures a returned defective product and we are unable to service it we shall provide you with a product that has at least the same value from one of the successor series The specifications like weight size and others should be seen as guide values Due to ongoing technical improvements which are done in the interest of the product LRP does not take any responsibility for the accuracy of these specs LRP Distributor Service e Package your product carefully and include sales receipt and detailed description of mal function e Send parcel to your national LRP distributor e Distributor repairs or exchanges the product e Shipment back to you usually by COD cash on delivery but this is subject to your national LRP distributor s general policy MA00188 LRP electronic GmbH 2008 1 EXPLOSIONSZEICHNUNG EXPLOSION DRAWING 32110 LRP ZR 21 X aaO Go co on 38542 8 Oo 38542 gt CARBURETOR 38502 contains complete carburetor 38543 Manifold rubber 38503 38503 Ta POA wu 2 ERSATZTEILE SPARE PARTS BEST NR Art
12. r you must know if a piston liner conrod has worn out and if they need to be replaced If you replace one part please check if everything else is still in good shape at the same time If you only change one part and other parts are in bad shape there s the possibility that there will be a new failure soon Some important matters e Clean the outside of the engine properly before you open it Any dust or dirt which gets into the engine could make considerable damage Check the conrod frequently If you want to replace the conrod be sure the big end of your crankshaft is still round and at a good size If not also replace the crankshaft When you start putting your engine back together make sure that each part is totally clean before installation and please use some oil after run is suited well to lubricate everything Be careful that each part has its correct direction especially piston liner conrod Please also check the explosion drawing The lubrication hole in the conrod should be facing to the front direction to the carburetor Before you install the combustion chamber please doublecheck that you installed all head shims Use a hex wrench to install the screws When you start to feel resistance stop turning the screw Repeat this for each screw use the star technique to tighten all the screws complete ly Do not overtighten them 12 TROUBLE SHOOTING GUIDE PROBLEM REASON SOLUTION Engine does not start Glow plug defective
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