NR RACING IS CLOSED 5/20 thru 5/29.
Online orders will be accepted and shipped during this time, however we are not available by phone or email during this period


Shipping Cut Off times: Fed Ex Ground is 12 noon | Fedex Express is 2 pm
We recommend FedEx as USPS delivery times can vary
Large orders, engines, heads, custom, special order, etc may not ship same day

Note: Due to fraudulent activity, new customers must ship to billing address! Orders received with different shipping addresses will SHIP to the billing address


Hop Up Kit, GX340 - GX390, 420 Predators and 13/15hp, Stage 1 Header, Mini-Chopper, Side Outlet, GX200, 6.5 OHV, & 212 Predator, Straight End (1")
Our Price: $58.99
Our Price: $24.99
Hop Up Kit, GX340 - GX390, 420 Predators and 13/15hp, Stage 1 Header, Mini-Chopper, Side Outlet, GX200, 6.5 OHV, & 212 Predator, Straight End (1")

Basic kit for improving the performance of GX390s, 420 Predators, 13/15 hp Chinese OHVs. Simple to install, you can expect significant performance increases.

Stage 1 Kit includes

  • Race/Open Air Filter & Adapter,
  • HD Valve Springs
  • Offset Timing Key,
  • Main Jet for application (see Notes)
  • Pilot Jet
  • Choke Hold Down Bracket
  • Optional Header/Exhaust
  • Optional Carbs (includes insulators)

Picture for reference only and may show optional parts. See above description for actual content. Header not included unless specified.

Filter should be sprayed with K&N type oil, especially in dirt applications. Oil not included click here

Billet Aluminum flywheel recommended. Stock flywheels, esp "Clone" are prone to failure and very DANGEROUS

Note: UT2s series Hondas (2012 & up) have Rev Limited coils and will require a new coil to exceed 4000 rpm. The UT2 coils (4 wire) can only be used with stock flywheels or 6693 ARC flywheels. If using any other Flywheels, you must run a UT1 style coil (single wire). Most 390 “clone”, 420s, and 460s have UT1 style coils already (However some Lifans and 420s have a rev-limited digital ignition)

If you are unsure of which kit is need, check your STOCK main. If stock main is a :

  • #92 thru 97, use a UT1 kit,

  • #98 thru #102 use a Hemi Kit’

  • >102, Use a UT2 kit

Mini-Bike pipes that exits over left side. Great for applications where there is not enough between tire and seat for Center Pipe.
Straight 1" pipe for use with 1" RLV or other Aftermarket mufflers.

Also works with 1 1/8" mufflers if NRR-125X2 adapter is used.
an also be used w/o a muffler for maximum performance and sound.

Picture for Reference only. MUFFLER NOT INCLUDED
Engine Kit, 202cc, 2.186 (+.060) Stroker, 2.68 Bore, Clone Crank & Piston Hop Up Kit - GX240 - GX270 and 8/9hp Chinese OHV, Stage 3
Our Price: $219.99
Our Price: $369.99
Engine Kit, 202cc, 2.186 (+.060) Stroker, 2.68 Bore, Clone Crank & Piston Hop Up Kit - GX240 - GX270 and 8/9hp Chinese OHV, Stage 3
202+cc engine kit.

OEM Crankshaft welded and ground producing .060 more stroke, Includes

Clone Crank (weld and ground),
ARC Billet Rod,
Clone Flat Top Piston w/Rings,
Wristpin & Clips.

Puts piston at TDC, Increases displacement by 5 cc or more. Increases compression ratio approx 1.0 points. Designed to leave piston .005 in the hole, but due to variation of blocks, piston may need to be shaved. Note: This is not a bolt in kit, but for experienced engine builders.

Balancing is required (58 grams total , 29 per counterweight for ARC rod and FT piston) , Note: Not included unless specified.


As step up from the Stage 2, this kit is designed to improve the power for the GX340s and GX390s along with improving the durability.


Includes:


  • Race/Open Air Filter & Adapter

  • Choice of Carbs

  • HD Valve Springs

  • Offset Timing Key

  • 280 Lift Cam

  • Reinforced Rockers

  • Billet Rod

  • Carb and Side Cover Gaskets

  • Optional Header/Exhaust

  • Optional Aluminum Flywheel


    Picture for reference only and may show optional parts. See above description for actual content. Header not included unless specified.

    Note: Use of the Choke Bracket requires use of a stock Honda (or Chinese OHV) "Air Filter to Carb Gasket". This is not included in the kit. You can use the one that came with the motor, or can purchase one at

    http://www.nrracing.com/product-p/16220-za0-702.htm


    Picture for reference only and may show optional parts. See above description for actual content. Header not included unless specified.

    Filter should be sprayed with K&N type oil, especially in dirt applications. Oil not included click here


    Billet Aluminum flywheel recommended. Stock flywheels, esp "Clone" are prone to failure and very DANGEROUS

    Note: UT2s series Hondas (2012 & up) or later have a built in Rev Limiter in the coil and will require a new coil to exceed 4000 rpm. The UT2 coils (4 wire) can only be used with stock flywheels. If using a Billet Flywheel, you must run a UT1 style coil (single wire).

    Chinese Engines usually have UT1 style coils already. However some Lifans and 420s have a digital ignition and will need a Honda UT1 coil to run the billet flywheel.

    If ordering for a 301, be aware some engines have large Cam Journals (.6357), most 301s have standard cam journals (same as GX270s). If you have a 301, we recommend you measure your cam journals before ordering this. (if in doubt, order the small journal).


Header, Mini Bike, Single, Side Outlet, GX200, 6.5 OHV, & 212 Predator, Flared End *(1 5/16") Engine Kit, 214 to 236cc, 2.310 Billet Stroker Crank, Wiseco Piston - GX200 & 6.5 Chinese OHV's
Our Price: $24.99
Our Price: $499.99
Header, Mini Bike, Single, Side Outlet, GX200, 6.5 OHV, & 212 Predator, Flared End *(1 5/16") Engine Kit, 214 to 236cc, 2.310 Billet Stroker Crank, Wiseco Piston - GX200 & 6.5 Chinese OHV's
Mini-Bike pipes that exits over left side. Great for applications where there is not enough between tire and seat for Center Pipe.
Pipe is flared to 1 5/16" for use with RLV 1 5/16" Mufflers. Can also be used w/o a muffler for maximum performance and sound.

Picture for Reference only.
214 to 232cc KIT Stroker Kit.
Our Stroker Kit for the Honda GX200, BSP, and Clone engines is the basis for building a +.175" stroker producing up to 232cc