Deant23 Posted February 18 Report Share Posted February 18 Good afternoon, I have a 2011 beta evo 250 2t. Had it for a couple of years now. Having s issue where when I rev it, it can take ages to come back down. I have tried messing with mixture screw and doesnt seem to make any difference if 2 out or 3/4 out. I have had the card apart and clean all indivicdual components with carb clean. Again no difference. I have tried to spray brake clean at intake system to see if it revs it doesnt change. Am I right in thinking this could be the crank seal? Or am i barking up the wrong tree? Also its does idle fine. TIA Quote Link to comment Share on other sites More sharing options...
guy53 Posted February 18 Report Share Posted February 18 Could the cable be the colprit Quote Link to comment Share on other sites More sharing options...
Deant23 Posted February 18 Author Report Share Posted February 18 New throttle put on, cable oiled and free as a daisy Quote Link to comment Share on other sites More sharing options...
lineaway Posted February 19 Report Share Posted February 19 What carb is on the bike? Should be a pwk, but old enough it could be anything. Quote Link to comment Share on other sites More sharing options...
Deant23 Posted February 19 Author Report Share Posted February 19 It is a pwk 28 Quote Link to comment Share on other sites More sharing options...
lineaway Posted February 20 Report Share Posted February 20 The jet tower gasket can leak and cause all kinds of poor behavior. That`s the piece inside the carb with torx security screws. The original gasket can shrink. The mating surfaces are not very plumb. Some people have good luck filing the surfaces flush. Sometimes just a new gasket fixes the issue. You can also search you tube for ways to test your carb. Quote Link to comment Share on other sites More sharing options...
lineaway Posted February 20 Report Share Posted February 20 Ps You can take off the flywheel cover. Grab a hold of the flywheel to feel any movement. If you feel any up and down movement, you need new main bearings and seals. Quote Link to comment Share on other sites More sharing options...
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