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Old December 31st, 2012, 07:40 AM   #19
cuong-nutz
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Name: Cuong
Location: Houston, TX
Join Date: Apr 2011

Motorcycle(s): '10 250r, '09 265r

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Quote:
Originally Posted by beninja View Post
Just for learning purposes, does this mean you have to replace the rings that go around the piston to regain compression?
Not necessarily.

If your rings are shot, you can try putting some oil through the spark plug hole to see if compression increases. If it doesn't increase than your valves aren't seating or are bent. You'll have to check your valves and see if they're in spec. and you can do a leak down test. which pressurizes the cylinder and checks to see if your valves are seated properly. If your rings are bad, you'll probably have to get the cylinder bored over and go with the next up oversized rings.
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