Oil leak from front cylinder - Honda RC51 Forum : RC51 Motorcycle Forums
 
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post #1 of 7 (permalink) Old 09-15-2012, 04:10 PM Thread Starter
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Oil leak from front cylinder

It looks like I have a fairly sizable oil leak coming from where the exhaust attaches to the front cylinder. What would cause this? I just had the valve clearances checked and they were good. Anything else to check? Thanks!

Last edited by dakota137; 09-15-2012 at 04:29 PM.
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post #2 of 7 (permalink) Old 09-15-2012, 05:49 PM
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My guess most likey is the gasket for the front cylinder valve cover is pinched...who did the valve check? If you paid someone to do it then take it back and get them to fix it proper.



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post #3 of 7 (permalink) Old 09-15-2012, 06:34 PM Thread Starter
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Hmm - I did. It doesn't seem to be leaking from there though - just from where the exhaust exits. That seal is pretty dry...
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post #4 of 7 (permalink) Old 09-15-2012, 07:27 PM
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Ok one other thing I can think of is that when you did the valve check some oil dribbled in the spark plug well. In that well there is a drain to allow water to exit so it doesn't accumulate. Is it still oily or is it dissipating?



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post #5 of 7 (permalink) Old 09-19-2012, 05:13 PM
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On someof the older (4 cyl) Wings, there were drain holes like nobody mentions in the plug recesses. Caused a missfire when water would accumulate in there instead of draining out. I realize this is a bit of a different issue, but the solution to clearing the drain holes was to run a fine wire through it to clear the obstruction and the missfire would stop. Might do the same for the seeped oil you have there. I'm thinking if the gasket is ok the hole might be plugged and some oil got spilled in there.

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post #6 of 7 (permalink) Old 09-19-2012, 09:43 PM Thread Starter
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Thanks for the help - I'll check it out.
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post #7 of 7 (permalink) Old 10-06-2012, 12:27 PM
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"Nobody" has the answer. Even though it appears the leak is coming out the exhaust its a valve cover gasket seal. Usually ends up being around the plug or one of the bolts. Chances are the old gasket(s) were old and crusty and new ones weren't installed. Once a seal has been removed and it has begun to firm up it is not a good idea reuse it as it will never seal back to the the same spot/position. I've run into this a couple times on the RC....where a gasket seal in the valve cover family begins to leak and it looks like its from the exhaust itself.
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