I could use some help, too. I just finished jetting my carb (also 450x) and am having a heck of a time trying to get the intake boot and seal to fit properly again on the carb. There is just so little room in there to work (and it is hard to see). Does anybody have any tips/tricks to make this any easier?It sounds like you are proficient are working on the carburetor so please do not take insult to this recommendation. I suspect that even though you said all is clean that the pilot jet may still have a slight restriction from debris. The symptoms you described are usually the pilot jet.
Other items to inspect:
Air fuel screw o-ring and orientation.
Air leaks on the intake boot and seal to the carb.
Rubber seal at the throttle cable holder on the carb top.
Throttle slide for wear - Doubt this one but worth a check it.
Air filter condition and seal.
Hope this helps a little a most the things that can give you symptoms you described.
Thanks. I have one and I will give that a try.Hello. First it is important to have the rubber warm so that it is flexible. I have used a cotter key extractor tool many times on bikes to hook under the rubber boot with a slight trace of lubricant and "roll" the boot onto the manifold or carb throat.
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