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Quad starts fine and revs fine in my back yard. On a test ride it falters badly. No power. I have cleaned and rebuilt the carb, cleaned the fuel tank, installed new fuel filter, changed fuel line and cleaned the air filter. Any help would be appreciated.

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Did it run fine and then one day not?  Did you rebuild the top end and maybe get timing off a mark?  What does the plug look like?  Did you clean the jets out with a bit of wire or torch cleaning tips when you cleaned the carb?  How does the diaphragm look on the throttle slide?  Any holes in it?  Does it rev to WOT in neutral but dies under load? 

Give us a bit more specific info to work with and I bet the group can help you find the issue.

 

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