I'm really thinking it is in the choke. I disassembled the carb and rebuilt it with a kit. You also asked if a clogged muffler could be your problem, I would guess that it isn't your problem, but I can't rule it out. I disassembled the carb and rebuilt it with a kit. I originally had the clip on the needle on the second from the top ring.
Carb has been rebuilt, air filter is clean, Compression is good,it's fouling plugs like crazy and the choke seems to make very little difference. It was draining out of carb into airfilter box. Carb has been rebuilt, air filter is clean, Compression is good,it's fouling plugs like crazy and the choke seems to make very little difference. We are talking about the same idle air screw. With this circuit wide open, fuel flows into the venturi at the rate needed to sustain a full throttle application, obviously this is going to make things way too rich. This problem was happening before the carb rebuild but I only removed the cable then put it back on when I put the carb back on.
Usually if turning the choke on or off has little to no affect, that means there is something wrong with the choke. It acts like a choke problem but everything checks out ok. It was draining out of carb into airfilter box. I'm puzzled and ready to just buy a new carb. Thank you all for your help.
If thats ok then i would look closley at your jets. The plug looked good after about 15 minutes of running it. The machine would start and idle fine, but as soon as you touched the throttle, it would begin to run extremely rich, and would only clear up when you opened the throttle completely, and would backfire when you let the throttle off. Changed the oil and filter and air filter and new choke plunger and cable. I assume you cleaned or replaced the air filter? It's affect is similar to richening the pilot circuit, but you don't have to make a permanent adjustment, switching the choke on and off is essentially richening or leaning out the pilot circuit instantly.
It grabs before the engine has a chance to rev, which stalls it. The suggestion you got about the fuel valve leaking fuel into the intake vacuum is a good thought. All I can say right now is By pilot screw, do you mean the one for the idle circuit? I do think that it is possible that a timing issue, or improperly adjusted vavles could be giving you problems. It's gotten to the point where it was parked for 4 years just because of the issues. Could a clogged muffler cause this? I noticed right away the choke plunger on the carb was broken and probably the reason it was running bad but now the old gas was evaporated and like turpentine. All I can say right now is By pilot screw, do you mean the one for the idle circuit? Meaning that water got inot my carb. Registration is fast and you can even login with social network accounts to sync your profiles and content.
However, there appears to be a small o ring, washer and spring left over from the kit. It explains why it would die when making tight turns as well. The cable elbow is under the handgrip so I never noticed it had come loose. Lastly, check for air leaks. Blew air through the petcock etc. Took the carb off and cleaned it.
I'm pretty sure we are talking about the same screw, it is commonly called the idle circuit, pilot circuit or low speed circuit. Blew air through the petcock etc. He gave up and brought it to me, he said he wanted to check the vavles, so I did that first, they were fine. Issue 3, bad shocks: The springs or shocks are bad and the quad leans hard when getting on. It's gotten to the point where it was parked for 4 years just because of the issues. Lastly, check for air leaks.
With this circuit wide open, fuel flows into the venturi at the rate needed to sustain a full throttle application, obviously this is going to make things way too rich. It explains why it would die when making tight turns as well. I got a friend of mine over who knows carbs better then I do and seemed puzzled as well. I cleaned the main jet with solvent and poked a wire through it to make sure it is clean. I'll use it as a spare.