oil leak near rear exhaust port? - Star Motorcycle Forums: Star Raider, V-Max, V-Star, Road-Star Forum
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post #1 of 5 (permalink) Old 05-03-2016, 09:53 PM Thread Starter
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oil leak near rear exhaust port?

So my last trip out, I came home wondering why I kept smelling burning oil at every stop light. I couldn't see anything during my quick peeks and when I got home, I could see no smoke or see any signs of oil leak.

A few days later I came out to check it out and found the leak - it's at my #2 exhaust (rear) and the oil is all around the top bolt for the exhaust manifold.

I cleaned it all off with engine cleaner, blew it dry with my air compressor and started it. It looked good at first and then I noticed smoke coming from the stud in the gap between the manifold and the head. I checked the rest of the area and found oil lightly spread around like it does but could not see a definite leak.

Is it possible that the oil is leaking from the stud itself? It seems to be around both studs which is a little odd...but I guess if the PO tightened the studs in too far they could have broken through the head in the back?

I also thought it might be the exhaust tappet cover at the bottom so I tightened that a little. I'm at a loss. I just got this bike last year and I'm hoping it's nothing major. I'm looking forward to putting 100,000 miles on it like my last bike if I can.




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post #2 of 5 (permalink) Old 05-03-2016, 10:51 PM
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Most likely coming from the valve cover you mentioned.

Simple fix (try first): Remove o-ring. Clean area of debris. Flip o-ring and reinstall.

Slightly more complicated fix: Buy new o-ring, clear area of debris, install.

Common problem, nothing crazy to be concerned over
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post #3 of 5 (permalink) Old 05-04-2016, 09:03 AM
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What ever you do do not over-tighten....

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post #4 of 5 (permalink) Old 05-04-2016, 12:10 PM
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I have the same issue. Started last time I checked valve clearances. Its such a slow leak it doesn't drip but just seeps out and wicks to all the surrounding area. The exhaust is directly below it so naturally that's where it going to head to the most. O-rings are only a few $$ from the dealer. I bought 4 new ones to install on my next check. Think they were $4 and change each. Yamaha part number -
93210-62446

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post #5 of 5 (permalink) Old 05-04-2016, 06:18 PM Thread Starter
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Thanks everyone. I came home today and pulled the tank and chrome covers off, doused it with engine cleaner in all the nooks and crannys, rinsed and blow-dried (compressor). Then I ran it with the tank off and just watched it with a bright light....it is coming from the valve cover....orings here are $6...I'll get one today and replace it tomorrow and see.

As far as overtightening...I really don't know how I would use a torque wrench on this...none of mine will fit. I can just estimate 14# of pressure with my allen wrench. I get what you're saying though...don't strip the aluminum head...lol

Thanks again for everyone's input. It was just so sudden it threw me for a loop.
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