SV650.org - SV650 & Gladius 650 Forum

Clean it, carefully. Then run it and watch closely to see where the oil is coming from.

The Curvy's clutch cover is not an unusual place to find a leak - but it isn't the only place that could be the possible cause. Don't buy second hand parts if you want certainty - buy new ones. Despite commonly read experiences a warped Curvy clutch case is not common, which is not to say it can't happen, but it's plastic so unless grossly misshapen will flatten under correct bolt tension. Another thing - it's plastic, (we've been here haven't we?), and will just as easily twist out of shape if you overdo tightening the bolts.

Then read this:

Quote:

Originally Posted by Sid Squid

This could be the clutch casing if it's an early model, where the outermost plastic section is separate, leaks from here are not unknown, having fixed a few of these leaky covers I now know that a new 'O' ring is rarely needed, (and is a painful £10~ish), remove the cover and clean the surface of the crankcase where the outer edge of the cover touches it, you'll notice the edge of the case is a little corroded, this corrosion expands a little and lifts the cover enough for crankcase pressure to squeeze a dab of oil out of the join.

And this:

Quote:

Originally Posted by Sid Squid

Remove the plastic cover and very carefully scrape away the almost inevitable ring of corrosion from the engine case outboard of where the 'O' ring groove is, this will allow the plastic cover to shut square and even against the side of the motor. Obviously make sure the plastic cover is undamaged and don't overtighten it as it can distort. These two I'm sure you're more than aware of, but the correct setting for these bolts is rather less than you might expect.