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Hop Up Kit - GX200, 6.5 Chinese OHV's, Stage 4 Hop Up Kit - GX200, 6.5 Chinese OHV's, Stage 4

Our Stage 4+ kits allows you to customize a kit for your application. The 4+ kit starts with package similar to that of the stage 3 kit but adds a Ported and Milled Head, stainless valves, billet rockers, and a serious cam package. Options include everything from roller rockers to stroker kits. This kit will allow you to build a motor in excess of 20+ hp.


  • Race/Open Air Filter & Adapter,
  • 22mm Mikuni Carb Kit (other carbs optional)
  • Ported & Milled Chinese OHV Head
  • 1.2 Billet Rocker Arms
  • Chrome Moly Pushrods
  • Stud Kit
  • 26 lb Springs,
  • Lash Caps
  • Offset Timing Key (not with all flywheels)
  • Gasket Kit
  • Billet Rod (not shown in picture), std with Chinese OHVs, .020 with GX200s
  • Billet Guide plate
  • Choice of Compression Ratios - Compression ratios based on Flat-Top piston. If a Dished piston is used, deduct approx 1.5 points,
  • Choice of Cams
  • Optional Long Rod
  • Optional Roller Rockers
  • Optional Flywheels
  • Optional Crankshaft
  • Optional Stroker Kit
Honda Kits use genuine Honda 18cc Heads, Clone Kits use 22cc Clone Heads (Honda kits will fit Clone if 18cc head is desired)

Picture is for reference only!!! Actual content based on above description and selections. In otherwords, the flywheel shown is optional!!
Due to the head work involved in these kits, Allow 1 week to ship

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

Note: This kit will not fit Harbor Freight 212 (predator) engines. Please see our Predator Kits for those applications

These kits are intended for experienced engine builders. Some clearancing, fitment, or other engine building "tricks" may be needed.

Aluminum or Honda flywheel recommended. Stock flywheels are prone to failure and very DANGEROUS

Our Price: $619.99