Re: crank to rod slack – opinions ?

[frankr]

fleetwin pretty much said it all. Any wear at the big ends of the rods will be easy to see with the naked eye. If the surfaces are smooth and the rollers are not flat-spotted, it is OK. They just don’t wear out unless it has been ingesting water or something–and you would see the water marks or pitting. 1/4" slop is just too much for roller bearings without obvious visual defect.

Having said all that, take a better look at the wrist pins. Those were prone to wear on the 25hp motors. Both the bushing in the rod, and the pin fit in the pistons.