quad revving on its own when start...video included
 

quads revs on its own..i no its somthing to do with carb can any1 help or suggest what to try next to try fix it ?:thanks:

Either the idle adjustment on the side of the carb is turned up too high, or the slack adjustment on the throttle cable next to the throttle is too tight. Rookie move to increase the idle that way. Last option is something else is holding the side from returning to the close position. You would need to disassemble the card to correct that.

Like whygostock said, its 1 of 3 things with the carb. the idle screw is turned in to far, there is no free play in the throttle cable ,or something physically is keeping the slide from dropping into the carb..

It also could be a vacuum leak causing a high idle.

I found that there is vacum leak is there any cheap ways fixing this ?thanks

Where is the leak coming from?

I will post picture of position later so u can see ....the first is the seel that goes between the intake and the carb and the second d is were the filter is attached

The black spacer and o-ring between the carb and intake are known fro cracking. We offer replacement spacers as well as upgraded air filters.

Between the intake and the carb is the only vacuum leak..Id go to a local hardware store and get a oring that fits.. the filter leak only dirt in..

I'll head to hardware today and see what I can find and let ye no what happens

I have this same issue, when I start my Yamaha YFM 350 R it wouldn't sit idle at all unless the choke was on even if I was riding it and I came to a stop it would need choke to run.

so I replaced all the jets in and completely renewed the carb, now it wont even sit in idle with the choke on I need to Feather the throttle to keep it running, i tried to adjust the idle screw but it has seized so i'm going to renew that, but for now is there anyone that has any other ideas of what it could be ?