Pistons and Rings

90mm Aftermarket Flat-top Piston for big bore GX390s. Fits stock bore on 420 Predators (non-hemi). GX390s Blocks can be bored to accept this piston407cc using stock crank,433 with +.160 Stroker Cranks,440cc with .200 CrankIncludes Piston & Rings (...

90mm Rings set for 420cc Predator and other Chinese OHV engines Top Ring at .076" thick 2nd at .076" thick Oil Control Ring at .106" thick These will not fit the "thin ring" pistons

90mm Aftermarket Flat-top Piston 420cc Predators. Will fit most 390 style engines when bored to 90MM's. Valve reliefs for Hemis. Slight bevelPiston measures .660 from top of piston to top of wristpin. GX390s Blocks can be bored to accept this piston407cc...

Piston Pin with (2) circlips .788" diameter pin at approx 2.436" length Fits most 13-16 HP Clone engines.

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