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Originally Posted by goinbig
Ok, probably a dumb question, but here goes.
I was mainly just wondering why it seems that 2 stroke engines need to be rebuilt so often? Is it something caused by the rider (like over-revving the engine, etc)??
And going along with that, how often do they normally need to be rebuilt? And what is the average cost (a rough guess-timate) usually for all the parts neccessary?
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Are you referring to racing Motocross 2 strokes or regular enduro off-road? It depends on the total hours on the engine and whether its raced or trail ridden. I've got a '03 Honda CR250R and didn't re-do the top end until it was 2 years old. Just put in a Wiseco Pro-Lite piston and rings ($120.00) and had it bored and cylinder nickosil re-plated ($250.00). I still have the original clutch and transmission.
The 85cc and 125cc 2 strokes are higher revving than a 250cc and may require rebuild sooner. Honda recommends re-doing the top end on a two-stroke that is habitually raced every 12 hours.
In contrast, I had a late 70's model Yahama RT enduro and rode it for 3 years and it never needed the top end or anything else rebuilt. The compression tested as good as the day I bought it.