Hello,

I am hoping someone can help me with my problem. When I reach top speed my 650 starts to bog. When I let off the gas and go slaower, it stops. It seems I can never go full out. If I just pin it from a stop it's fine. It's only when I reach top speed that it starts to bog. Can anyone help.

Thank you

 

Did you add any motor/airbox mods lately? I had a similar stumble problem at high speeds right after I did a bunch of motor mods (Napa hose, twin air filter, Nyroc muffler mod and DAJs) and soon discovered that my main jets were too rich. Once I rejetted to a smaller jet size, the problem went away.

Good luck and Happy trails...[img]i/expressions/face-icon-small-smile.gif[/img]

 

Check your fuel pump pressure before you tear into your carb.

It wouldn't hurt to check the intake snorkle for a restriction also.

 

Mine was the opposite of Mikeyboy's, did it even stock, got worse with exhaust mod and snorkel, went to the 142/145 main jet combo and seemed to cure the problem, runs great now.