Help! I have a 2005 BF 650 that starts and idles great it even rev's smoothly when you gas it. The problem is it act's like it is just reving up to slow (About 50% as quick as it should be) It does not miss or backfire it just acts like it in in a mode for children to ride it. Since this problem started I have
Adjusted the Valve.
Gone through the carbs.
Reset the belt switch (numerous times).

Can anybody help me?

 

Do a leak down test, or at least compression check to see how tight the engine is. Always do the basic mechanical checks first for engine related issue before guessing anything.

 

Thanks but I got it fixed... the previous shop had the carbs off and pinched both of the carb slider diaphrams under the covers so they were both leaking and the slides would not raise.