PISTON SUPER DUTY 4.250" BORE M8 114/117 TO 128"+.005 11.7:1 200-3524 Our TFI Power Boxes come

Our TFI Power Boxes come pre-set with a middle of the road setting already compensating for the aftermarket exhaust

Textured left ramp gives you sure footing to walk your snow bike onto truck/trailer

2008 Honda XR650L

2019 Honda CRF230F

PISTON SUPER DUTY 4.250" BORE M8 114/117 TO 128"+.005 11.7:1 200-3524 Our TFI Power Boxes comeAnodized top ring groove and crown Line2Line Abradable skirt coating applied to . 003" total thickness for a ZERO initial fit to allow coating to hone in for a tight quiet running clearance Round wire locks Premium Hastings 1. 2mm 1. 2mm 3. 0mm Steel Nitride top ring with a Ductile Napier second ring Forced wrist pin oiling M8 version with flat top 1. 2cc with compression height 1. 083", valve pockets sized to accommodate 1mm oversize valves All