Super Jet How much play between rod and crank shaft?

[rossthaboss11]

during the tear down i noticed there was some slop and play between the front rod and crankshaft. Some play up and down and a bit of play from left to right. This was on the blown cylinder side. the other side is much more snug with little play. Is this an issue? do i need a new rod bearing?

 

[rossthaboss11]

and when i say left to right thats by grabbing the top of the rod and pushing it from front to back of the motor using the crankshaft as a pivot

 

[augustaf]

big rod end side clearance: 0.012" - 0.028" - use a feeler gage. Up and down play should not be noticeable! No pitting in the small end. Usually, noticeable rust on the crank cheeks is not a good sign.

 

[rossthaboss11]

ok thanks for the info. Im probably just gonna swap the whole crank shaft/rod assembly with one from a 61x or 6m6 motor i have laying around. From what i understand they are all interchangeable correct? and isnt the 6m6 lighter so i should go with that one?

 

[augustaf]

Yes, 650-760, are all interchangeable. I'd pick the better looking one.