Quote:
Originally Posted by iancp5
Most people change once a year to be sure but the bigger the bike the less they need it. The 300's need it least but it really depends on how you are using them as well as how many hours on the engine. Higher rpms wear more. If you don't use it much and it's mostly low revs they'd last a long time in a 300. A 125 is a different story because you have to rev the nuts off to get it to move and they rev higher as well. Some only have 1 ring too.
But you don't want to wait until it fails! Sudden drop in compression or rattle means change it immediately or at least diagnose what's wrong. If a piston fails in use it could cause a lot of damage - read expense.
This may not help but there is no easy answer on a dirtbike hence many do them once a year and guys racing hard on 125's probably more often.
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ok thanks for your help, not sure about hours, but milleage is now 2600