15-1250 GX390 1.250" ID 3 Stage Header

15" X 1.250" ID 3 Stage Straight Header for the Honda GX390.

15-990 GX390 3 Stage Header .990" ID

15" Long X .990" ID 3 Stage Straight Header for the Honda GX390. 

27-3464 GX390 STD 88MM (-.050) Stroker Piston Kit

Stroker applications (-.050)Shorter compression height. Std bore 3.464 Clearance .0025 (@.850 down from oil land). Use stock GX390 UT1 T3 rings Use enclosed wristpin (Can also use GX390 wristpin, but must be shortened) Comes with Piston, Wristpin and 2...

27-3543 420CC STD 90MM Piston Kit W/O Rings

Forged 420cc Diamond Piston 90mm (3.543) with valve reliefs. Clearance .0025 @ .850 down from oil land. Wrist pin 0.787" x 2.0" Contents: Piston, Wrist pin and 2 Clips. Rings part number DJ-4290(see related items) sold separately. Piston may require...

27-3543-S 420cc Std Stroker 90mm Piston Kit

For Stroker applications (-.050") Bore: 90mm (3.543") Clearance .0025" (@.850 down from oil land) Contents: Piston, Wristpin and Clips. Use DJ-4290 rings.

5884 GX390 Small Hole Blower Cover

GX390 Small hole blower cover

5885 GX390 Big Hole Blower Cover

GX390 Big hole blower cover

5886 GX340/GX390 Starter Cover

Cover for starter hole on Honda GX340/GX390 blocks for those not using an on-board starter.  Will work on Predator 420 and Vegas 460cc blocks

6059 Honda GX390/420 Billet Sidecover

Honda GX390/420 billet sidecover. Machined from 6061-T6 aircraft grade aluminum features dual crank bearings and cam bearing for extra support. Uses all 4 dowel pens in the block for extra block support. A must for all modified and stroker applications...

6059E O-Ring for 6059,6060 Billet Sidecover

30" .070 Buna-n O-Ring for our 6059 and 6060 Billet Sidecovers

6059S GX390 Crankshaft Shim Kit

Kit contains two .1mm shims and two .2mm shims

6060 460cc OHV Billet Sidecover (10 Bolt)

Billet dual bearing sidecover for the 460cc OHV engine. Features dual crank bearings to reduce crankshaft flex and ball bearing camshaft support. Uses all 4 dowel pins for extra block support. Comes complete with o-ring gasket, crank seal, crank shims,...