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If you haven't taken that carb apart and cleaned it in awhile - more than likely your jets (what's used to pick the gas up out of the bottom of the carb (the bowl) are clogged up. You can pick up a can of carburetor cleaner with a wire basket inside from any major parts store specifically for carburetors to soak in. The size of a paint can & around $20. Soak the carb in that for awhile after disassembling, make sure none of your ports are clogged - air compressor gun or you can also use keyboard cleaner - air dusters. You want to verify that air can pass through all those ports properly and blowing air through them is how you do it. Carb does need to be completely disassembled to do this. The jets in the carb suck up fuel due to the vacuum the engine creates turning over. Once it starts spinning - it builds up a little suction and everything is fine. When the jets start to clog - one of the ways to force the carb to pull harder is to work the choke. The only thing that choke is doing is operating the butterfly. When the choke is on - the butterfly closes. Making all of that suction stay right there in the carb. Once the bike starts to warm up - you release the choke - and the butterfly will open - allowing more air into the system. You're running at half choke - butterfly half closed - to force those jets to pull harder. If they were clear? No need to run at half choke. Hope that broke it down for you - All The Best, Justin M. 17 South Industries, LLC
sounds like it has been sitting, if you have never rebuilt a carb, best to bring it in,, the main jet is probably all gummed up,, you can try draining all your tank gas,, spraying carb cleaner into the carb after removing air cleaner but that really wont help out the main jet.. Stabil is a good product for gas if you are going to store your ride for awhile, it also acts to clean carbs while using a small amount when you fill up.
Most of the time it's because the Pilot/Idle jet is clogged in the carburetor. This most often happens because of old fuel sitting in the carburetor during long periods of sitting and non-use. The fuel forms a varnish - a gummy layer inside of your carburetor and clogs the tiny holes in the idle jet. Since fuel can't get through, the engine dies. The hole for the choke is larger, therefore the fuel can still get through it.
Your pilot jet in the carb is plugged up or to small you will have to pull the carb out and clean it if you have a wire brush you can use 1 of the needles off it that will fit in the tiny hole in the pilot jet push it through and then spay carb cleaner through it and the main jet put back together and it should run fine