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Thanks for the advice, I will check into this again. It seems from the oil location that it is seeping from a crack - not sure how it could travel from the shift seal. But it's worth a shot still. Thanks,

I checked today, basically the JB-weld formed the same exact crack as on the case underneath it. Maybe it's a high stress zone of the engine when it's vibrated and prone to weakness there? I am going to get a quote for how much it would be to do a proper aluminum weld job at that spot.

So I rode it tonight (24 hours) and it is still leaking. Back to the drawing board with this one, oh well.

From what i've read it handles vibrations fine, just not high heat+vibration (e.g. exhaust manifold). I think the rear engine case has a pretty good chance of being a strong fix. I will ride tomorrow afternoon to see if it lasts a day at least...

And after the JB-weld, I will admit it's not pretty but honestly don't care too much. The only thing I was worried about was JB-welding the engine to the frame where the rearsets through-bolt goes through. But oh well!

Pointing out where the crack is:

Ok JB-weld gets here today and I have been prepping the area: I took a light dremmel to the surface and scuffed it up. I am cleaning it with Kerosene too. I am planning on just applying a bunch of JB-weld to the entire area, and cleaning it up so it looks as good as it can.

Unfortunately my newly bought RC 390 has a bit of an oil leak. Using UV oil and light I was able to see clearly where it came from, right near the rearset through-bolt! How would you guys proceed from here? Repair the case at a shop/dealership, use JB weld to patch it up, other techniques? Any...

I finally got around to doing this, and unfortunately some bad news. I found there is a small hairline crack in the rear engine case, near the rearset through-bolt I was talking about before. The crack is about the length of a pink fingernail, and has a similar curvature. Pictures to come...

Thanks I will give this a shot! I am almost certain it's engine oil, question is exactly where.

Thanks for all the replies guys. I know the pictures don't capture it very well, but it is definitely leaking oil after a short ride, it drips down the side of the engine case in this picture: The only reason you can't see it profusely is that I clean it regularly and just did a clean oil...

Hey guys, New to this forum and my RC390, it has about 7K miles on it. I just bought it and doing all the regular maintenance and noticed a small leak. It seems to come from the M10 screw bold that goes through the rearsets + frame + engine. Pictures below, any help would be greatly...