my carb adaptor went bad too. Make sure you have good fresh gas without water in the system and replace the fuel filter and clean the carb and jets.
if you ride in the cold winter you should use isyoprophal(sp?) alcohol (HEET) in almost every tank.

 

wouldnt recommend that... use it in very minimal ammounts if u do... only use it if your exhaust is white and water is present on the exhaust hole

 

That's what I read from the tech section on this site or maybe DW. I wouldn't put the whole bottle in but at least a couple ounces. It must be the isopropyl type.

This read below isn't where I got that from, I couldn't find it , but here is some other good info related to gas and carbs....

101 ATV Tips

There are plenty of things you can do to your quad to make it run better, last longer, and be more reliable. We have come up with a lengthy list of items we know can help you prepare for the trail or track. Included is everything from basic carb jetting tips to how to set up your gear for your next long distance ride as well as some handy tools and devices.
So consult our list of 101 tips, products and procedures, and find the ones that will help improve the overall performance of your ATV or equipment. Read on and prosper…

8. Always remember to turn your fuel petcock off. Believe it or not, gravity will cause the carburetor to flood. Be sure and always carry a spare spark plug in the correct heat range for your machine should it flood out.

19. If you use gas out of a plastic gas can, make sure you rotate the gas through it regularly. Gasoline deteriorates more rapidly in plastic cans than it does in metal cans.

20. If your machine starts sputtering and missing while crossing streams, then you probably need to either get a new waterproof spark plug cap or apply dielectric grease to the stock plug boot. You should be able to find the grease in any auto parts store.

22. You can make your own race gas by mixing premium pump gas with octane extender and get an octane rating of around 104.

26. A general rule of thumb on correctly jetting the carburetor on a high-performance quad for the weather is that every 15 degrees of air temperature change, up or down, requires a main jet change. You can usually get by on one 15 degree change without rejetting but rarely two. This usually does not apply to 4x4 and utility riders of most four-stroke ATVs which can withstand varying temperatures all day long with no major changes.

27. Cold weather requires larger main jets (higher number) warm weather requires smaller (lower number) jet sizes. Example: if it’s 70 degrees and you run a 155 main jet, at 55 degrees install a 158 main jet. Generally, you need to compensate with the main jet more for cold weather than when it’s hot.

28. Another rule of thumb for sport riders. Every 1500 feet of elevation increase requires one jet size change down. Example: If you live at sea level and run a 155 main jet, then when you go to 1500 feet switch to a 152 main. The opposite applies if you’re jetted to run at a high altitude and then go down 1500 feet.

29. AV gas is not necessarily the hot setup for racing engines. The octane ratings on Aviation gas don’t include a motor knock test that is included in the testing of race and pump gas. This additional test can change the octane rating of the fuel and show AV gas as having a higher octane rating than it actually does. AV gas is also harder starting in cold weather. Therefore, it is not as good a value as some riders might think. Always consult your engine builder before using AV gas.

30. When discussing the carb slide needle clip position, number one is the top position and, therefore, the leanest setting. It is best to start your carb jetting procedures with the needle clip in the middle or #3 position. The needle jet controls the 1/4 to 2/3 throttle settings.