Reply To: Upgrading Johnson qd-14 10 hp ,want info on cranks and parts

[frankr]

For the upgrade, you need the following parts for each cylinder:

2- 302577 retaining rings
1- 307849 wrist pin
1- 378251 wrist pin bearing
1- 378285 piston
1- 378330 connecting rod

These parts update the pistons & pins to the 1962-63 style. No need to replace crankshaft or crank bearings

Don’t pay any attention to the casting numbers on the parts.