Hi everyone,
First post here.
I got a 17 Slim S with around 5000 km(3000miles) on it. I bolted SE585 cam in and 2-1 exhaust around 4000km. But didn’t like the loss of low end power. So, I pulled the head off and sent out for head work. Meanwhile, I took the cylinder off and putting SE 10.5:1 pistons in.
However, I found out the cylinder wall have some light scoring. Then I took off the pistons. The skirt of pistons are worn. Pistons are covered by the carbon build up on the top. The most unbelievable thing is the piston rings are out of orientation. The gap of the top and second ring are close to each other (please see attached pic).
I’m planing to bore and hone the cylinder, then put a set of +.010 pistons in.
Question that I can’t figure out. What caused the damage on cylinder wall and piston skirt? How can I avoid it happens again after rebuild?
Thanks