CARBURETOR
EXHAUST SYSTEM
RUN-IN
FUEL
Z.28R SPEC.3
TRUGGY
Wilhelm-Enssle-Str. 132-134, 73630 Remshalden, Germany
Tel.: int+49-7181-4098-0, Fax: int+49-7181-4098-30
WARNING NOTES
ORDER NO.:
32809
3.95 HP
38.500 RPM
TECHNICAL DATA
AIRFILTER
GLOWPLUG
8+1 (8xtransfer-, 1xexhaust-port)
13.0mm / 3 Turbo scoops / SG-shaft
VTEC.28 Heavy Duty, black coloured
Fully CNC-machined, high-silicium alloy
Fork shaped aluminium using double bushings
LRP Standard style R6 (No. 35060) included
VTEC thermal protected Competition slide carburetor
with venturi inserts (7.5, 8.5 and 9.0mm included)
*Figures may vary depending on used fuel, muffl er and tuning.
• Never leave your RC model unattended when the engine is running. If a fault should occur the
result could be a fi re in the model which could destroy anything else in the vicinity.
• All nitro engines produce gases which are very dangerous for your health; one of them is
carbonium monoxide which can lead to death! Always use your engine outdoors or in well
• Nitro engines and their surroundings get very hot. You can seriously burn yourself when you
• Never try to stop a running engine with your fi ngers. Pinch the fuel line or close the top of the
• Not suitable for children under 14 years, this engine is not a toy.
ever use regular gasoline or airplane fuel. Use fresh 2-stroke model car fuel only! We recom-
mend using our line of LRP high-quality fuels
(No. 35710: 25% 1L / No. 35730: 25% 3,5L)
engine we recommend a fuel with 25% nitro. A higher nitro content
decreases your engine’s lifetime. Therefore do never exceed 36% nitro.
A good airfi lter is very important for the life of your engine. Never run without an airfi lter, as
quick and permanent damage will result! Don’t forget to impregnate the airfi lter with a suitable
oil before usage. Carefully clean the airfi lter at least after every tenth tank. Replace the airfi lter
every 3 litres (~1 gallon) of usage.
We recommend the use of our LRP Hi-Flow 2-stage airfi lter (No. 36560) toge
Hi-Flow airfi lter oil (No
Use only standard style glow-plugs for this engine. We recommend using our line of high-quality
LRP Platinum / Iridium glowplugs
, availabe as R3 to R6). 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 fi rst!
TIP: Our LRP raceteam always uses
a LRP Platinum / Iridium R6 (No. 35060) plug for the
Truggy engine. Only when the ambient temperature is
Platinum / Iridium R5 (No. 35050) plug
hank you for your trust in this LRP product. By purchasing a LRP nitro engine, you have choosen
a high-performance and highly sophisticated product, which doesn´t make any compromise
between maximum performance and easy tune
ability. We hope you enjoy your new engine.
Please read the following instructions
to ensure, that your LRP Z.28R Spec.3 Truggy engine
always works up to your full satisfaction.
Please read and understand these instructions completely before you use this product!
With operating this product
, you accept the LRP warranty terms.
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
1/8 Off-Road Competition exhaust system
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
rance = Thickness of head shims
nstruction of the engine an
d the compression of the head shims, when the
We suggest to start with 0.20mm (0.008“) 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.
The factory settings of the engine are as following and are a good starting point for you, if you
are not satisfi ed with your carburetor settings. Turn in the needles completely (Caution: Do not
overtighten them!) and loosen them the required number of turns again:
Adjusts the air fl ow when carburetor is fully
Adjusts the air fl ow when carburetor is fully
closed. Turn CW for higher idle-speed and
closed. Turn CW for higher idle-speed and
CCW for lower idle-speed. Should be open 0.5-
CCW for lower idle-speed. Should be open 0.5-
Adjusts the mid/low-speed fl ow rate of the fuel.
Adjusts the mid/low-speed fl ow rate of the fuel.
Turn CW for leaner and CCW for richer setting.
Turn CW for leaner and CCW for richer setting.
Adjusts the main fl ow rate of the fuel (when the throttle is opened
signifi cantly). Turn CW for leaner and CCW for richer setting.
Carburetor venturi inserts:
o affect the fuel/air mixture, you can use different venturi inserts on this carburetor.
These are to fi netune your engine to different track layouts.
There are three different venturis
coming with the engine: 7.5mm, 8.5mm and 9.0mm.
, 7.5mm has the best fuel consumption.
roper run-in of the engine is a very important step in ensuring that you get the highest perfor-
mance and lifetime of your engine.
Take 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 ½-turn to decompress the engine and try again. Don’t forget to tighten the glow-plug
again once the engine started!
• Start the engine and set the main-needle very rich, i.e. excessive smoke coming from the
• Let the engine idle for 2mins fi rst 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, 70-90°C (160-195°F) is per-
• Let the engine cool down for 15mins after each tank during the run-in period.
• We recommend doing so for 4 tanks of fuel before you start tuning your engine.
To Next Page
Need help?
General
