I just bought the same exact quad. It had the same exact problem. Poor idle and back firing. Your video helped out tremendously. Turns out that there was nothing wrong with my petcock. The vacuum line from the carb to the petcock got too hot and the vacuum collapsed the line. No vacuum no gas. The carb looked brand new but I took it apart anyway. The air/fuel screw was put together in the wrong order and I moved the clip on the main jet to the 3rd spot. Runs like a champ now. Thanks for the insight.
Interesting.I have a 2001 Quadmaster 500 that jut started doing this same thing. Gets worse when the motor is hot. Ill try replacing the vacuum line then the petcock. Bought a new carb but hopefully ill be returning it.. Thx
I just bought the same exact quad. It had the same exact problem. Poor idle and back firing. Your video helped out tremendously. Turns out that there was nothing wrong with my petcock. The vacuum line from the carb to the petcock got too hot and the vacuum collapsed the line. No vacuum no gas. The carb looked brand new but I took it apart anyway. The air/fuel screw was put together in the wrong order and I moved the clip on the main jet to the 3rd spot. Runs like a champ now. Thanks for the insight.
So glad this video helped!! I’m glad you got your quad up and running.
Will this fit a quadmaster 500, 2000 ? Looks like mine holes might be different spacing.
I have this same atv and same issue. I’m wondering. Can I just plug both ends of the vacuum part, on the carb and petcock. And just run it on prime
I hust purchased a 2001 quadrunner the gguy i bought it from says its a 400. You think its 400 or 500?
I got a quad master and this fixed mine same thing just fully automatic
Hell yeah! Glad the video helped!
Interesting.I have a 2001 Quadmaster 500 that jut started doing this same thing. Gets worse when the motor is hot. Ill try replacing the vacuum line then the petcock. Bought a new carb but hopefully ill be returning it.. Thx
If Intake boot is leaking could that cause a vacuum problem ?
Yes, you can test while the engine is running spraying the boot down with starting fluid and listening for a change in rpm
do you know where the air fuel screw is
Bottom of the carb towards the intake boot.
try 1 3/4 to 2 1/3 turns out from being fully, but gently, turned into the seat.
Do you know how many quarts of oil this engine calls for?
3.4 quarts, it takes that much due to the wet clutch
Poor old girls got the farts.
Do you still have this bike? I'll buy it. Or do you have any bikes right now that you're trying to sell?