This is the LRP Nitro Engine ZR.32 Spec.4 Pullstart Nitro Engine. The LRP ZR.32 Spec.4 Pullstart is based upon the very popular ZR.32. In order to be able to again increase the enormous power of the .32 monster, we build in a completely constructed carburettor that has an additional notch for improved adjustability and that provides an even more efficient fuel-air mixture.
This leads besides an improved idle speed setting, also to better responsiveness and more torque. The already known Heavy-Duty CoolDown- Max cylinder head provides sufficient cooling for this power unit.
- MASSIVE Big Block size - You cannot replace displacement with anything… but even more displacement!
- New CoolDownMax cylinder head - Improved cooling and higher efficiency through new cooling fin arrangement
- XTEC PowerCarb3 15S-2 carburettor - Flow optimised carburettor with built in 9.0mm venturi for maximum power
- Universal fit - Fits all major .21 engine mounts
- 5 + 1 Ports
- FREE PLUG - FREE LRP Platinum / Iridium R5 glow plug included
- Standard burn room - Guarantees easy adjustment of the engine in all conditions
- XTEC T6 engine housing - Especially reinforced heavy duty engine housing for toughest offroad action
- Massive con rod - Extra reinforced con rod. Specially adjusted for .32 engines
- Ultra strong pullstart - Pullstart specifically developed for big block engines
- Power Start capable - Prepared for the use of the LRP Power Start for starting the engine at the push of one button
- Torque you can barely handle
Cubic capacity: .32 (5.24 ccm)
Power: 4.37 HP*
RPM: 33.300 RPM*
Number Channels: 5 + 1
Glow Plug: LRP Standard R5 (No. 35051)
Carburetor: XTEC PowerCarb3 15S-2 with machined in 9mm venturi
Class: 1/8th Offroad Buggys/Truggys
* Figures may vary depending on used fuel, muffler and tuning
This product was added to our catalog on October 4, 2018
Once I got it to startup and began the Break-in process,, I gradually found that the "low" needle needed to be turned almost the entire way in until it bottomed out, and then only back out about 1/4 to 1/2 turn in order to get it to start, and idle, and run correctly... very far from the factory recommended setting of about 4.5 turns out from bottomed.
Initially while attempting to start with the stock settings on the carb, it was so rich and so out of tune, that due to the extended and constant attempts to get it running and keep it running - it ended up breaking the one way roller on the pull start. So before I could finish and run the first tank of fuel through it, I had to already dissemble it and swap the one-way roller that luckily I had from other similar motors that fit and worked the same.
I've now had the motor up and running for a couple of weeks and no matter how much I mess with the carb tuning, the low needle is only about 1/4 turn from bottom. And the high needle is close to recommended default settings. Its impossible to reach out to anyone from LRP for help on this, so I've simply left the carb as is, and it actually runs very good like this from idle to off-idle and into wide open.
I've tuned and worked with as many as 25+ Nitro motors in cars, truck, airplanes and even RC boats since the mid 1980's,, I consider myself very experienced and knowledgeable and a very good carburetor and Nitro tuner, and have never seen a carb do this before in these applications.
Once broken-in and deciding to leave and work around the low needle at the nearly bottomed settings.... I have to say this motor is extremely powerful and tugs along great in a Savage XL. Tons of off-idle TQ and great top speed also. This motor is much louder as far as exhaust goes then anything I've seen/heard that are the typical .28, .25 and .21 and etc.