BORE KIT 104cc

54mm Piston, 10.5:1 Compression

American made premium quality forged piston.  Precision CNC machined for superior power and increased engine life.  Extremely lightweight!  This kit bores into your stock cylinder.

INCLUDES:  Piston, pin, rings, circlips, headgasket (choose correct gasket when ordering).

REQUIRES:  Boring, rejetting. 

Honda supplied 2 different headgasket designs with the 90, please check your gasket and order the correct one.

STROKER 8.4mm

124cc 11.5:1 Compression with our 54mm bore kit

Great torque and midrange power.

INCLUDES:  Work done on your crank.  Rod parts are available if needed (additional cost).

REQUIRES:  Send in your crank for modification.  Download our Stroker Booklet for details.

RECOMMENDED: Works best with Powroll pistons. Modifications may be required if using other piston or cam brands.