Ec 300 2018 not reving down

[eralha]

Hi, a couple of rides ago after washing my bike and heading back home i noticed that the rpms would not drop after acceleration it would keep accelerating. Cleaned carb checked the reeds and put a clean air filter, next ride it run good until after the end of the ride where it started to do it again after i pull a little hard on the throttle. Today i did an mostly enduro ride, slow speed and no problem at all after washing the bike the problem appeared again, i noticed that the air filter was a bit wet. Could it be a crank seal?

I should also mention that when this started to happen i did half a turn out on the carb air screw, after this change only on specific occasions it will do the high rpm.

The reeds are good, the carb boot is good, in the middle time i have put a new piston and rings.

Need some guidance, i'm thinking that is the left hand crank seal(wet one).

Thanks.