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SinstaNSR
19th October 2006, 06:31
How necessary is it to replace 2 stroke pistons on a top end rebuild especially if its never been done.. ? :mellow:
Motu
19th October 2006, 06:59
Measure and report.....
Racey Rider
19th October 2006, 07:02
Not enough info in the question.

After 1000Km - why is the rebuild being done? If the piston looks alright, just change the rings.
After 10 000Km - Probably doesn't need it, unless obviously damaged. But if money is no problem, might as well change pistons too.
After 100 000km - Probably needs doing!

We went through this in a thread last week about two stroke reliability.
It depends what you expect from the motor.
The_Dover
19th October 2006, 07:06
shouldn't a hardcore speedfreak apprentice mechanic with 15 years riding experience know such gems?

what do you fix? lawnmowers?
Forest
19th October 2006, 10:23
How long is a piece of string?
Jonny Rotten
19th October 2006, 17:00
whats a piston ?
Maha
19th October 2006, 17:17
How long is a piece of string?

Its the distance between the two ends.....thought everyone knew that?....:lol:
lukelin250
19th October 2006, 21:30
why not may aswell save you doing it some other time
Mr. Peanut
19th October 2006, 21:50
Replace pistons every 60000km unless you see obvious signs of wear. Rings circlips etc... every 30000km. (Using a good oil, letting it warm up and not redlining every gear helps.)