So what's up with 220's having problems with pistons. Are all years, through current affected? What are the major causes of the problems? What can I do to not have problems?
The bike is virtually unchanged for many years so one would expect the piston is unchanged also. Some broke - some didn't. When I heard this, I disassembled mine and it's frightening !! The skirt of that OEM is way too thin and criss crossed with sharp casting marks -just inviting cracks to form. I immediately replaced it with a Weisco & it runs strong [but noisy - as did the oem]. If you go Weisco, make sure the con rod circlips are completely seated. Some didn't seat properly, came out and ruined engines.
The general rule of thumb is they only have problems when in a quite modified hard-ridden bike.
Don't think that would make me feel any better about it.
Keep in mind the wiseco fit issues. They are a forged piston and require a bit more clearance than a cast piston. Certainly DO measure it, though. Break it in right!
My stock 220 piston has 4 seasons on it and no problems (previous owners fault.) I am replacing it with a Wiesco this winter. I will be sure to measure the bore and the piston before installing.
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