The ol Mystery machine

Noidea

XS650 Addict
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what up guys back again with another wierd mystery thing with this engine. So I ride a couple of times it was alright done all the basic maintence sugesstionsvalce timing camchain tension point timing blabla. I have an issue now bike starts fine still has the strange no idle on side stand with choke offf although the float level is fine even with the sight tube test. But now if I let it idke than go out for a ride by the time the engine warms up my idle will slowly rise. It was suspicious to me so I sprayed brake clean around the engine and it goes up a little bit more when sprayed at the right side front of base gasket. Figured with thermal expansion maybe if there’s a leak when engine warms it would make idle higher. But there’s no oil leaking from there and the compression when not run for a week or so dead old is 124 both sides wouldn’t compression go down if that was the case as well. Any ideas?
 
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