ring end gap - Wrist Twisters
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post #1 of 4 Old 05-21-2014, 04:34 PM Thread Starter
Join Date: Nov 2013
Location: Glendale
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ring end gap

Im working on a 2003 XR650L, I have to completely rebuild the top end, new piston wrist pin rings and all that other good stuff. I've been looking thru the service manual and I can't find the spec for the ring end gap. I was wondering if anyone on here might know what the spec is for it.

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post #2 of 4 Old 05-22-2014, 02:14 PM
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Rarely have I had to dress the end gap on motorcycle engines. When you drop the new rings into the cylinder, what gap readings do the get? If it's not a fresh bore, it's a good idea to check the ring gap at the top, bottom and center of the stroke.
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post #3 of 4 Old 05-22-2014, 08:18 PM Thread Starter
Join Date: Nov 2013
Location: Glendale
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The owner ran the bike without oil and seized the piston it didnt do any damage to the cylinder but it shaved down the intake side of the piston. I cleaned the cylinder with muratic acid to get the aluminum out and rehoned the cylinder. Im putting in a new piston, rings, wrist pin, and circlips.

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post #4 of 4 Old 05-27-2014, 05:28 PM
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Location: Granite Falls
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check page 1-8 of the service manual
top ring: 0.20-0.35 (0.008-0.014)
2nd ring: 0.35-0.50 (0.014-0.020)
oil ring: 0.2-0.7 (0.01-0.03)

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