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2000 Suzuki Quad Master 500 Backfires

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This is my first time in here so here it goes. I have a a problem with my Quad Master 500. It started about 6-8 months ago. It starts up great and idles fine. When I put it in gear it runs great but all of a sudden it starts to jerk and back fire. When I put it in neutral I give it throttle it will rev and die down. It wont shut off it just surges up and down. It will do this for about 20 min. or so. I will shut it off then start it up then it will work fine for along time. Then all of a sudden it will start to jerk and back fire. I put new plug, air filter and fuel cleaner but it still acts up. This has has been a great bike and a good work horse at the cabin. Does anyone please have an thought what it might be or lead me in the right direction. I think it could be in the carb. but not shure. Thank you

Edited by Ajmboy
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Could be a fuel starvation problem, or an intake air leak. Check the machine for air leaks by spraying WD 40 or carb cleaner around the intake area, if you hear any changes in the idle, you are sucking the stuff in and probably have an air leak there. You also may want to check the fuel valve and look inside the carb for deposits, it may need a good cleaning. Does the fuel valve have off-on-res settings, or on-res-prime settings? If there is a "prime" setting, and no "off" setting, you have a vacuum operated fuel valve, this could also be your problem. If this is the case, try running the machine with the valve in the "prime" position. Check the vacuum line that runs to the valve, make sure it is not leaking.

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