Well I went riding last night and when I get around full throttle (top end) it starts sputtering and doesn't want to go full throttle...the low range and mid are fine its just that top end.. I have a supertrapp exhaust and k &n air filter.. first thing that comes to mind is the main jet is a size to small...but ever since I had the quad its had those jets in it and the exhaust and filter....so what do you guys think?? to me it sounds like its the main jet but I just don't see why its been running fine with that jet in it for months and now all of a sudden its sputtering in the top end....if you think its the jet..what size do you think I need...I don't know what I have in there now. thanks

 

soundds like the air filter is dirty

 

The jet could be dirty too. Do you change/clean your fuel filter regularly? I would say that you probably have a piece of dirt or debri stuck in the jet

 

I just had a prob kinda like yours. Turns out my secondary spring broke...

 

could be alot of things!!! start wit a kinked gas vapor line, then clean the filter, then check the carb if all else fails check the clutches

 

im having the same problem my dad said i need to rebuild my carb but it only does it if i wont warm it up enuff or am going full throttle in 6th after going from 1st to 6th i dont stop at ne other gear fer more then lik 2 secs cuz i ride w/yfz's and preds and z400's but im ordering a new filter and c if it helps and change my oil and then take my carb apart this winter

 

Had the same problem...changed the fuel fuel filter and put a new plug in and walah! problem was fixed. I might have also just lucked out! [img]i/expressions/face-icon-small-smile.gif[/img]

 

Well I figured later on today I would check the filter...even though I just recharged it so I'm sure thats fine...I still think its the main jet...but I'll check some other stuff..I might just go spend six bucks and buy a couple new main jets at different sizes and see if thats it..but I'll do some checking on it..I still think its air/fuel problem..