Features & Benefits:-
* Heat-treated 4140 material is harder & 114% stronger than stock.
* Harder material, eliminates thrust washer.
* Larger 1.671″ diameter crankpin.
* Designed with increased cross-sectional area for increased crank-pin clamping force – No welding required.
* Integral mainshafts – Eliminates two potential points of weakness.
* Consistent balance and precision machining – Truer flywheels & less vibration.
* Reduced mainshaft deflection at high rpm – less vibration, reduced piston & rod side thrusting, prevents oil pump damage, fully compatible with gear drive cams.
* Capable of higher rpm – More available power!
* Trued to with in .0005″ TIR
* Rod Bearings have 20 rollers vs 18 stock
Tech Tips:-
* 2003-2006 motors can be upgraded to the stronger “Timken” crankcase bearing. Part # SS320-0397
Proudly Made in the USA by S&S Cycle !
MFR PART No: 320-0396
REVELRY PART No: SS320-0396
