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ZR.32 spec.2
pullstaRt
user guide
ORDER NO.:
32820
4.34 Hp
33.000 RpM
MA00227
© LRP electronic GmbH 2011
7. carburetor
5. exhaust system
8. run-in
2. fuel
6. head clearance
1. specification
3. airfilter
4. glowplug
Engine size
.32 (5.24ccm)
Exhaust
Rear
Bore
19.80mm
Stroke
17.00mm
Liner
ABC
Number of ports
5+1 (5x transfer-, 1x exhaust-port)
Crankshaft
14.0mm / 10.0mm bore / SG shaft / Triple Turbo scoop
Crankcase
Black coloured LRP XTEC T6 .32 Heavy-Duty Competition
Piston
Specially lightened and made from high-silicium alloy
Connecting Rod
Oversized, knife-edge shaped and made from extra strong
aluminium with double bushings
Glowplug
Standard style. LRP Standard R5 (No. 35051) included.
Carburetor
LRP XTEC PowerCarb2 15S-2 with 9mm venturi.
Made from lightweight Aluminium.
Power Output*
4.34 HP
Max. RPM*
33.000
Weight
420 g
*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 (No. 35711: 25% 1L / No. 35731: 25% 3,5L).
For the LRP ZR.32 Spec.2 Pullstart engine, we recommend a fuel with 25% nitro. Never exceed
36% nitro. A higher nitro content will decrease your engine‘s lifetime, but it will produce more
power.
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 with 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.
Oiling the airfilter is very important as an airfilter without oil has nearly no cleaning ability which
will result in a damaged engine after a very short time. We recommend the use of our LRP Hi-
Flow 2-Stage Oval airfilter (No. 36565) together with our LRP Hi-Flow airfilter oil (No. 36590).
Use only standard style glowplugs for this engine. We recommend using our line of high-quality
LRP Platinum / Iridium glowplugs (No. 35031 - No. 35061, availabe as R3 to R6). Check them
frequently and never run with worn-out or old glow-plugs since they could damage your engine.
The glowplug will 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 several
times for no reason, replace the glow-plug first!
TIP: Our LRP team always uses a LRP Platinum / Iridium R5 (No. 35051) plug for the LRP
ZR.32 Spec.2 Pullstart engine.
Dear Customer,
thank you for your trust in this LRP product. By purchasing a LRP nitro engine, you have chosen
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.32 Spec.2
Pullstart engine. 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.32 Spec. 2 Pullstart
better. Please 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.
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 and the operating characteristic
of a 2-stroke engine.
For the LRP ZR.32 Spec.2 Pullstart engine, we recommend using our high-quality LRP Monster-
truck Hi-Performance pipe set (No. 36261) for maximum performance.
We recommend a real head clearance between piston and burnroom of about 0.70-0.75mm
(0.027-0.030“) 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 + 0.40mm*
We suggest to start with 0.30mm (0.012“) 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.
Nitro content
16%
20%
25%
30%
Real head clearance
0.60mm / 0.024“
0.70mm / 0.027“
0.70mm / 0.027“
0.80mm / 0.032“
Head shims
0.20mm / 0.008“
0.30mm / 0.012“
0.30mm / 0.012“
0.40mm / 0.016“
Please note: The head clearance is already pre-set in the factory for optimum performance and
does not need to be changed to make the engine run perfect. This setting should only be used
by experienced model makers.
* (that‘s due to the internal construction of the engine and the compression of the head shims, when the cooling
head is mounted)
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:
Idle screw (No.1):
Adjusts the air flow when carburetor is ful-
ly closed and is the mechanical stop for the
throttle valve. Turn CW for higher idle-speed
and CCW for lower idle-speed. In neutral, the
valve should be open by approx. 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.
• Mid range:
5,25 turns
• Main:
5,50 turns
Main speed needle (No.3):
Adjusts the main flow rate of the fuel at full throttle or when the throttle is opened
significantly. Turn CW for leaner and CCW for richer setting.
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. 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!
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 till the fuel tank is empty. It will be slow and sluggish, but this is
an important step.
• Do not allow the engine to rev-up too high and only apply half throttle during this run-in peri-
od.
• The engine should not be too cold, but also not too hot during run-in. 70-90°C (160-195°F) is
perfect.
• Let the engine cool down for 15mins after each tank during the run-in period.
• We recommend running with this rich setting for 5 complete tanks of fuel before you start
tuning your engine.
LRP electronic GmbH
Wilhelm-Enssle-Str. 132-134
73630 Remshalden
Germany
www.LRP.cc
MA00227_LRP_ZR30_Spec2_Pullstart_manual_E_110909_fv.indd 1
09.09.2011 19:30:58