LRP Nitro Engine ZR.32 Spec.4 Pullstart Nitro Engine

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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)
Bore: 19.80mm
Hub: 17.00mm
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
Weight: 420g
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

Verified Owner
Friday, Oct 2 2020 (10 months ago)
LRP Nitro Engine ZR.32 Spec.4 Pullstart Nitro Engine
Was really looking forward to receiving this motor to install into a Savage XL. Could not get the motor running initially as the "out of the box" carb setting were way off and extremely rich.
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.
Verified Owner
Monday, Apr 5 2021 (4 months ago)
LRP Nitro Engine ZR.32 Spec.4 Pullstart Nitro Engine
This engine has tons of power. Took a gallon of fuel to break in, I also had to go with a hot glow plug. The factory needle settings were way to rich. I’m at 2 1/2 turns on the high side and 1 3/4 on the mid. But other than that thing is a beast! (#6 OS glow plug)
Verified Owner
Friday, Jul 31 2020 (12 months ago)
LRP Nitro Engine ZR.32 Spec.4 Pullstart Nitro Engine
Very powerful engine, wheelie monster on my Savage XL, however, I struggled to get it running because the factory needle settings are grossly inaccurate, took some time to figure out where the needles needed to be. This was verified on two engines, sent a email to tech with these settings. Cannot give a perfect review because LRP needs to address this issue, with online research I found that others had the same problem.
Verified Owner
Saturday, Jul 25 2020 (about a year ago)
LRP Nitro Engine ZR.32 Spec.4 Pullstart Nitro Engine
Awesome engine. Great all around engine. Amain is fast at shipping
Verified Owner
Monday, Apr 20 2020 (about a year ago)
LRP Nitro Engine ZR.32 Spec.4 Pullstart Nitro Engine
Engine would not start with factory settings at all due to being too rich and spitting fuel out of exhaust. I leaned it out a bit to get it started and the connecting rod broke after the pull starter spring unwound and jammed up. Very unhappy with this motor. I have been doing this for 20yrs and never had an engine function so badly
Verified Owner
Friday, Sep 11 2020 (11 months ago)
LRP Nitro Engine ZR.32 Spec.4 Pullstart Nitro Engine
As I have not received this order yet it is difficult to write a review. It is more than a week late and I am unable to track it. I have called UPS and they say it was transferred to USPS . USPS says they never received it. Would I recommend this to a friend? Absolutely not.