Hi there I am currently rebuilding a 95 Scrambler 400 2stroke and was wondering if any knew the maximum piston ring end gap before one should replace them. The top end was done not too long ago,(by another owner) and had bearing failure on the counter balancer. Thanks in advance.

 

dont have the scrambler manual but on the pred the first ring max gap is .7mm, 2nd is .8mm and the oil ring is 1.0mm. dont know if thatll help but its the best i got

 

actualy ignore my first reply and just call a local dealer and they will tell you.

 

If Ya got a Wisco piston in there you could also get a hold of someone over there and they could tell Ya also. They probably know their products better than anyone else.

 

Thanks but i've decided to put a new piston and rings and get the cyl bored as it is the only parts i wouldn't be replacing.