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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 3-5 minutes to get the
engine up to running temperature before doing any adjustments! Otherwise the engine is not warmed
up properly and the tuning is not correct.
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 (top-end) first.
4. Tune mid-range needle next.
5. Reset idle speed screw.
Procedure:
1. Set the idle speed so your engine doesn't stall (slightly higher then normal).
2. Go to the track with the main-needle set too rich. There should be heavy smoke coming from the
muffler now.
3. 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 between 110-130°C
(230-265°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 (counterclockwise)
1/4 turn.
4. Adjust the mid-range needle now. Run 3 full laps, stop the car near you and let it idle for 5secs.
Then push full throttle. The engine should have slightly richened up (idle rpm gets lower), but still
accelerate 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.
5. 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 too 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:
• Temperature gauge method (recommended): Take the temperature reading quickly after driving.
Place the gauge directly over the engine and let the sensor point at glow plug.
• Spittle method: Put some spittle on the engine's head directly after driving. 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 special „after-run oil" to keep the engine in good shape after you have finished your day. After-
run oil helps for an easy start the next time you drive 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.
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 of After-Run oil down the open carburetor and a few drops down the
glow plug hole. Spin the engine over several times so the oil spreads evenly inside the engine.
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 wear,
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:
• 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 completely.
Do not overtighten them!
12. TROUBLE SHOOTING GUIDE
PROBLEM
REASON
Engine does not start
Glow plug defective
Glow plug defective
Glow plug does not work properly
Engine is set too rich
(too much fuel, flooded)
Engine is too lean
(too little fuel, does not start)
Engine doesn't suck in the fuel
Engine stops after a
Glow plug defective
Glow plug defective
short time after glow
Bad fuel
plug igniter has been
Bad carburetor setting
disconnected
Dirt in fuel line or carburetor
Fuel line damaged
Fuel line damaged
Loose glow plug or cooling head
Air filter old and/or dirty
Air filter old and/or dirty
Performance decreases
Engine is set too lean
after reaching operating
temperature or engine
Glow plug defective or wrong
stalls from time to time
type
Engine runs too hot
Engine runs too hot
Shims under combustion chamber
wrong
Engine still keeps
Bad carburetor setting
running at high RPM
for a moment when you
release the throttle
Wrong glow plug type (too hot)
Shims under combustion chamber
wrong
REPAIR PROCEDURES /
LIMITED WARRANTY
All products from NOSRAM are manufactured according to the highest quality standards. NOSRAM
guarantees this product to be free from defects in materials or workmanship for 90 days (non-euro-
pean 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 NOSRAM if the product should be repaired
in either case. If there is neither a warranty nor guarantee claim, the inspection of the product and
the repairs, if necessary, in either case will be charged with a fee at the customers expense accor-
ding 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 NOSRAM 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 tech-
nical improvements, which are done in the interest of the product, NOSRAM does not take any
responsibility for the accuracy of these specs.
NOSRAM-Distributor-Service:
• Package your product carefully and include sales receipt and detailed description of malfunction.
• Send parcel to your national NOSRAM distributor.
• Distributor repairs or exchanges the product.
• Shipment back to you usually by COD (cash on delivery), but this is subject to your national
NOSRAM distributor's general policy.
SOLUTION
- Replace glow plug
eplace glow plug
- Check the condition of the glow plug
- Check the glow plug igniter
- Check carburetor settings and repeat the tuning
procedure
- Unscrew the glow plug completely and spin over the
engine several times
- Check carburetor setting and repeat the tuning
procedure
- Check the fuel line for possible damage
- Check the carburetor setting
- Replace glow plug
eplace glow plug
- Replace fuel with fresh and correct type of fuel
eplace fuel with fresh and correct type of fuel
- Check carburetor settings and repeat the tuning
procedure
- Clean fuel line and clean and check the carburetor
- Replace fuel line
eplace fuel line
- Tighten the glow plug or the screws of the cooling
head
- Clean or replace air filter
lean or replace air filter
- Check the carburetor setting and repeat the tuning
procedure
- Replace the glow plug by a correct type
- Run-in process is not completed
un-in process is not completed
- Check number of shims
- Open mid-range needle ¼ turn at a time and
re-adjust idle-speed
- Set idle speed lower
- Use glow plug with higher number (e.g. go from
5 to 6)
- Check number of shims
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