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Stage 4 Kit 420 Predator OHV & 13/15hp Clone

Stage 4 Kit 420 Predator OHV & 13/15hp Clone

Choose your options:
390/420 Carb Option(required):
390/420 Flywheel(optional):
390/420 Header & Exhaust(required):
390/420 Ignition Coil(required):
Product Code: STAGE4KIT420-P
Stage 4 Hop Up Kit for 420 Predator OHVs & 13/15hp Clones
This kit is similar to our Stage 3, but adds a ported and milled head with stainless valves, a stud kit, and heavy duty valve train components. Allows up to 35+ HP out of a 420 engine. This kit is for OHV engines and will not fit Hemis.

Kit Includes:
  • Fully Ported and Milled Race Head (Genuine Honda Core)
  • High-Torque Genuine Honda Core (The Best!!)
  • High-Flow 36mm / 31mm Valves with Lash Caps
  • Dual Springs with Titanium Retainers
  • 307 Race Cam
  • Black Venom Aluminum Roller Rockers
  • Valve Cover Spacer
  • Chrome Moly Pushrods
  • Choice of Carbs (Or use your own)
  • 90mm Forged Flat-Top Piston with Rings
  • Billet Rod (+.040" Longer)
  • Aluminum Flywheel Recoil Start
  • Offset Timing Key
  • Carb, Insulator, Head, and Case Gaskets
  • ARP Bolt Kit

This kit only fits 414 & 420cc (90mm) non-hemi engines. Filter should be sprayed with K&N type oil, especially in dirt applications. Oil not included - click here. Billet aluminum flywheel REQUIRED. These kits are intended for experienced engine builders. Some clearancing, fitment, or other engine building "tricks" may be needed. Picture for reference only. See above description for actual content.


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