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Stage 4 Kit 420 Hemi

Stage 4 Kit 420 Hemi

Product Code: STAGE4KIT420-H
Stage 4 Hop Up Kit for 420 Hemi
The Stage 4 kit starts with a package similar to that of the Stage 3, but adds a ported and milled hemi head with stainless valves, a stud kit, and heavy duty valve train components. This kit allows up to 35+ HP out of a 420!

Kit Includes:
  • Fully Ported and Milled HEMI Race Head
  • High Flow 40mm / 34mm Valves with Lash Caps
  • Dual Springs with Titanium Retainers
  • 307 Race Cam
  • Shaft Mounted Roller Rockers
  • Chrome Moly Pushrods
  • Choice of Carbs (Or use your own)
  • Forged Flat-Top Piston with Rings
  • Billet Rod (+.040" Longer)
  • Aluminum Flywheel Recoil Start
  • Offset Timing Key
  • Carb, Insulator, Head, Valve Cover, and Case Gaskets
  • ARP Bolt Kit

*Note: Picture is for reference only and may show optional parts. See above description for actual content. Filter should be sprayed with K&N type oil, especially in dirt applications. Oil not included - click here. These kits are intended for experienced engine builders. Some clearancing, fitment, or other engine building "tricks" may be needed. Billet aluminum flywheel required.
Product CodeNameOur PriceQty
Product Code:STAGE4KIT420-H-0001Stage 4 Kit 420 Hemi - 33mm Mikuni Pumper - Gas - Add Aluminum Flywheel - Electric Start - Add Header - Kart & Mini Bike - Add Genuine Honda UT1 CoilOur Price:$1,563.99
Product Code:STAGE4KIT420-H-0002Stage 4 Kit 420 Hemi - 33mm Mikuni Pumper - Gas - Add Aluminum Flywheel - Electric Start - Add Header - Kart & Mini Bike - Add UT2 Coil without Rev Limiter, for UT@ Hondas OnlyOur Price:$1,593.99
Product Code:STAGE4KIT420-H-0003Stage 4 Kit 420 Hemi - 33mm Mikuni Pumper - Gas - Add Aluminum Flywheel - Electric Start - Add Mud Motor Header & Muffler (GX390) - Add Genuine Honda UT1 CoilOur Price:$1,568.99
Product Code:STAGE4KIT420-H-0004Stage 4 Kit 420 Hemi - 33mm Mikuni Pumper - Gas - Add Aluminum Flywheel - Electric Start - Add Mud Motor Header & Muffler (GX390) - Add UT2 Coil without Rev Limiter, for UT@ Hondas OnlyOur Price:$1,598.99
Product Code:STAGE4KIT420-H-0005Stage 4 Kit 420 Hemi - 33mm Mikuni Pumper - Gas - Add Aluminum Flywheel - Electric Start - No Exhaust - Add Genuine Honda UT1 CoilOur Price:$1,522.99
Product Code:STAGE4KIT420-H-0006Stage 4 Kit 420 Hemi - 33mm Mikuni Pumper - Gas - Add Aluminum Flywheel - Electric Start - No Exhaust - Add UT2 Coil without Rev Limiter, for UT@ Hondas OnlyOur Price:$1,552.99
Product Code:STAGE4KIT420-H-0007Stage 4 Kit 420 Hemi - 33mm Mikuni Pumper - Methanol - Add Aluminum Flywheel - Electric Start - Add Header - Kart & Mini Bike - Add Genuine Honda UT1 CoilOur Price:$1,670.99
Product Code:STAGE4KIT420-H-0008Stage 4 Kit 420 Hemi - 33mm Mikuni Pumper - Methanol - Add Aluminum Flywheel - Electric Start - Add Header - Kart & Mini Bike - Add UT2 Coil without Rev Limiter, for UT@ Hondas OnlyOur Price:$1,700.99
Product Code:STAGE4KIT420-H-0009Stage 4 Kit 420 Hemi - 33mm Mikuni Pumper - Methanol - Add Aluminum Flywheel - Electric Start - Add Mud Motor Header & Muffler (GX390) - Add Genuine Honda UT1 CoilOur Price:$1,675.99
Product Code:STAGE4KIT420-H-0010Stage 4 Kit 420 Hemi - 33mm Mikuni Pumper - Methanol - Add Aluminum Flywheel - Electric Start - Add Mud Motor Header & Muffler (GX390) - Add UT2 Coil without Rev Limiter, for UT@ Hondas OnlyOur Price:$1,705.99
Product Code:STAGE4KIT420-H-0011Stage 4 Kit 420 Hemi - 33mm Mikuni Pumper - Methanol - Add Aluminum Flywheel - Electric Start - No Exhaust - Add Genuine Honda UT1 CoilOur Price:$1,629.99
Product Code:STAGE4KIT420-H-0012Stage 4 Kit 420 Hemi - 33mm Mikuni Pumper - Methanol - Add Aluminum Flywheel - Electric Start - No Exhaust - Add UT2 Coil without Rev Limiter, for UT@ Hondas OnlyOur Price:$1,659.99
Product Code:STAGE4KIT420-H-0013Stage 4 Kit 420 Hemi - 34mm Flat Slide Mikuni - Gas - Add Aluminum Flywheel - Electric Start - Add Header - Kart & Mini Bike - Add Genuine Honda UT1 CoilOur Price:$1,458.99
Product Code:STAGE4KIT420-H-0014Stage 4 Kit 420 Hemi - 34mm Flat Slide Mikuni - Gas - Add Aluminum Flywheel - Electric Start - Add Header - Kart & Mini Bike - Add UT2 Coil without Rev Limiter, for UT@ Hondas OnlyOur Price:$1,488.99
Product Code:STAGE4KIT420-H-0015Stage 4 Kit 420 Hemi - 34mm Flat Slide Mikuni - Gas - Add Aluminum Flywheel - Electric Start - Add Mud Motor Header & Muffler (GX390) - Add Genuine Honda UT1 CoilOur Price:$1,463.99
Product Code:STAGE4KIT420-H-0016Stage 4 Kit 420 Hemi - 34mm Flat Slide Mikuni - Gas - Add Aluminum Flywheel - Electric Start - Add Mud Motor Header & Muffler (GX390) - Add UT2 Coil without Rev Limiter, for UT@ Hondas OnlyOur Price:$1,493.99
Product Code:STAGE4KIT420-H-0017Stage 4 Kit 420 Hemi - 34mm Flat Slide Mikuni - Gas - Add Aluminum Flywheel - Electric Start - No Exhaust - Add Genuine Honda UT1 CoilOur Price:$1,417.99
Product Code:STAGE4KIT420-H-0018Stage 4 Kit 420 Hemi - 34mm Flat Slide Mikuni - Gas - Add Aluminum Flywheel - Electric Start - No Exhaust - Add UT2 Coil without Rev Limiter, for UT@ Hondas OnlyOur Price:$1,447.99
Product Code:STAGE4KIT420-H-0019Stage 4 Kit 420 Hemi - 34mm Round Slide Mikuni - Gas - Add Aluminum Flywheel - Electric Start - Add Header - Kart & Mini Bike - Add Genuine Honda UT1 CoilOur Price:$1,430.99
Product Code:STAGE4KIT420-H-0020Stage 4 Kit 420 Hemi - 34mm Round Slide Mikuni - Gas - Add Aluminum Flywheel - Electric Start - Add Header - Kart & Mini Bike - Add UT2 Coil without Rev Limiter, for UT@ Hondas OnlyOur Price:$1,460.99
Product Code:STAGE4KIT420-H-0021Stage 4 Kit 420 Hemi - 34mm Round Slide Mikuni - Gas - Add Aluminum Flywheel - Electric Start - Add Mud Motor Header & Muffler (GX390) - Add Genuine Honda UT1 CoilOur Price:$1,435.99
Product Code:STAGE4KIT420-H-0022Stage 4 Kit 420 Hemi - 34mm Round Slide Mikuni - Gas - Add Aluminum Flywheel - Electric Start - Add Mud Motor Header & Muffler (GX390) - Add UT2 Coil without Rev Limiter, for UT@ Hondas OnlyOur Price:$1,465.99
Product Code:STAGE4KIT420-H-0023Stage 4 Kit 420 Hemi - 34mm Round Slide Mikuni - Gas - Add Aluminum Flywheel - Electric Start - No Exhaust - Add Genuine Honda UT1 CoilOur Price:$1,389.99
Product Code:STAGE4KIT420-H-0024Stage 4 Kit 420 Hemi - 34mm Round Slide Mikuni - Gas - Add Aluminum Flywheel - Electric Start - No Exhaust - Add UT2 Coil without Rev Limiter, for UT@ Hondas OnlyOur Price:$1,419.99
Product Code:STAGE4KIT420-H-0025Stage 4 Kit 420 Hemi - None (Customer to Supply Carb) - Add Aluminum Flywheel - Electric Start - Add Header - Kart & Mini Bike - Add Genuine Honda UT1 CoilOur Price:$1,247.99
Product Code:STAGE4KIT420-H-0026Stage 4 Kit 420 Hemi - None (Customer to Supply Carb) - Add Aluminum Flywheel - Electric Start - Add Header - Kart & Mini Bike - Add UT2 Coil without Rev Limiter, for UT@ Hondas OnlyOur Price:$1,277.99
Product Code:STAGE4KIT420-H-0027Stage 4 Kit 420 Hemi - None (Customer to Supply Carb) - Add Aluminum Flywheel - Electric Start - Add Mud Motor Header & Muffler (GX390) - Add Genuine Honda UT1 CoilOur Price:$1,252.99
Product Code:STAGE4KIT420-H-0028Stage 4 Kit 420 Hemi - None (Customer to Supply Carb) - Add Aluminum Flywheel - Electric Start - Add Mud Motor Header & Muffler (GX390) - Add UT2 Coil without Rev Limiter, for UT@ Hondas OnlyOur Price:$1,282.99
Product Code:STAGE4KIT420-H-0029Stage 4 Kit 420 Hemi - None (Customer to Supply Carb) - Add Aluminum Flywheel - Electric Start - No Exhaust - Add Genuine Honda UT1 CoilOur Price:$1,206.99
Product Code:STAGE4KIT420-H-0030Stage 4 Kit 420 Hemi - None (Customer to Supply Carb) - Add Aluminum Flywheel - Electric Start - No Exhaust - Add UT2 Coil without Rev Limiter, for UT@ Hondas OnlyOur Price:$1,236.99

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