STOCK SPECIFICATIONS:    50mm BORE X 45.6mm STROKE

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.

00344 HONDA 90 104CC BORE KIT -- $235.00 CHOOSE HEADGASKET: COMPLETELY ROUND ROUND WITH NOTCHES Quantity

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.

16003 H STROKE CT-SL-ATC 90 -- $275.00 CLICK TO APPROVE: I am shipping my crank to Powroll. I have read the General Product Info Page. Quantity

MODEL DIFFERENCES
Crank designs are different between models. The following are Honda part numbers for various models, to assist you in determining which crank will work with your engine:
● ATC90 - All Years - #13000-071-010
● CL90, CT90, CM91, S90, ST90 - All Years - #13000-028-040 (all superceded from 13000-028-010, -020, and -030)
● SL90 - All Years - #13000-056-680
Cranks with the same Honda number will interchange, cranks with different Honda # will not due to rotor end length.
Determine what you have - Measure rotor end length (see photo below):
ATC 90 = 2.025"
CL90, CT90, CM91, S90, ST90 = 1.205"