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Engine Kit, GX390 Stroker, 420 cc (+.200), Cast Crank

420cc Engine kit. for GX390s

Choice of

  • Aftermarket Cast Crank with .200 More Stroke, producing 420cc
  • ARC Billet Rod
  • OEM Honda Piston machined to fit kit
  • OEM Honda Rings
  • Wristpin & Clips

Puts piston at TDC, Note: This is not a bolt in kit, but for experienced engine builders.

Available unbalanced or Fully Balanced.

Also available for GX340, please email.

Our Price: $299.99
Engine Kit, GX390 Stroker, 414 cc (+.160), Honda Crank

414cc Engine kit. for GX390s


  • Genuine Honda Crank welded and ground for +.160 more Stroke, producing 414cc
  • ARC Billet Rod
  • OEM Honda Piston machined to fit kit
  • OEM Honda Rings
  • Wristpin & Clips

Puts piston at TDC, Note: This is not a bolt in kit, but for experienced engine builders.

Available unbalanced or Fully Balanced.

Also available for GX340, please email.

Our Price: $499.99
Engine Kit, GX390 Stroker, 420cc (+.200), Billet Crank & Forged Piston

420cc Engine kit. for GX390s. The ultimate kit for high Revving GX390s

  • Billet Steel Crank producing 420cc
  • ARC Billet Rod
  • Forged Diamond Flat-Top
  • Piston Rings
  • Tool Steel Wristpin & Clips

Puts piston at TDC, Note: This is not a bolt in kit, but for experienced engine builders.

Available unbalanced or Fully Balanced (not needed for most appications) .

Our Price: $799.99