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Hop Up Kit, GX340 - GX390, 420 Predators and 13/15hp, Stage 1 Header, RLV NRR5438, GX200, GX160, 6.5 Chinese OHV, & 212 Predator, Mini - Bike Down Draft Style
Our Price: $58.99
Our Price: $24.99
Hop Up Kit, GX340 - GX390, 420 Predators and 13/15hp, Stage 1 Header, RLV NRR5438, GX200, GX160, 6.5 Chinese OHV, & 212 Predator, Mini - Bike Down Draft Style

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

1 5/16",  1.050 ID 23" IL.

Same as a  RLV 5438 but bent so that it kicks out to the right side. Allows it to fit most Mini Bikes.

WARNING: Pipe must be supported with a bracket/brace to either the frame or the engine otherwise pipe may fracture or  break.
Engine Kit, 202cc, 2.186 (+.060) Stroker, 2.68 Bore, Clone Crank & Piston Hop Up Kit - GX340 - GX390, 420 Predators, and 13/15hp Chinese OHV, Stage 2/3
Our Price: $219.99
Our Price: $439.99
Engine Kit, 202cc, 2.186 (+.060) Stroker, 2.68 Bore, Clone Crank & Piston Hop Up Kit - GX340 - GX390, 420 Predators, and 13/15hp Chinese OHV, Stage 2/3
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 1, this kit is designed to improve the power for the GX340s and GX390s along with improving the durability.

Header, Mini-Chopper, Side Outlet, GX200, 6.5 OHV, & 212 Predator, Straight End (1") Engine Kit, 214cc, 2.225 (+.060) Stroker, 2.756 Bore
Our Price: $24.99
Our Price: $289.99
Header, Mini-Chopper, Side Outlet, GX200, 6.5 OHV, & 212 Predator, Straight End (1") Engine Kit, 214cc, 2.225 (+.060) Stroker, 2.756 Bore
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
214+cc engine kit for GX200s & 65. OHVs using 2.756 bore

Genuine Honda Crankshaft welded and ground producing .060 more stroke, Includes Crank, Billet Rod, Flat Top Piston, Rings, Wristpin & Clips. Puts piston at TDC, Increases compression ratio over 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 (60 grams total , 30 per counterweight for ARC rod and FT piston) , Note: Not included unless specified.

Available in new style Predator (requires 6626 or 6602PH flywheels) or Old Style (requires 6625 or 6602P flywheels)