Spray cleaner is only good for the outside if the carbs, not so good at getting the varnish out of the passages. Use a fine wire to run through the jets, then blow out the passages.
Seeing as how at higher rpms it smooths out I'd say its in the carburetor. Idling is run by pilot circuit of carb., did you remove pilot jet and pass wire through to clean? I have seen time and time again where they are still partially blocked even though you can see through them, I take the paper/plastic coating off of a bread tie and use that to ream out the orifice of the pilot jet. Also spray carb clean with plastic nozzle on so you have some force through the pilot circuit of carb body while the jet is out, then while its still wet & soft use compressed air to blast out the carb clean and hopefully any gunk thats is built up in carb body. Just a thought.96 bearcat 440fc real hard to start seems to run on 1 cylinder , cleaned carbs,still doing it! get rpm up evens out. got to have idle screw all the way in to keep idling 120 psi both cylinders some times get popping sounds at higher rpm! had installed new cdi, new coil, sat for 3 years installed new used stator got great spark now! so got compression, spark, fuel and timing? any idea as to why its hard to start and some times pops and sometimes runs on 1 cyl.at idle
If after checking the choke cable as mentioned int he above post, the next thing would be the fuel pump is allowing fuel directly into the base.Ok.... I replaced my needle and seat assembly in both carbs due to flooding the crank case....I found the problem to the hard starting....my sled is still flooding the crank... even after replacing the needle and seats,What am I missing to stop the flooding??? Any help would be greatly appreciated I just don't know if I got a carb problem or seal and gasket.
I am having a similar problem. I have read all sorts of possible problems and have not narrowed mine down. My sled starts great on cold starts, idles fantastic, runs like a bat out of hell but when i shut it down and try to start it warm, it will not start or will sputter and stall out. I dont understand it. Could it be running too rich? What does this sound like to you all? Help please. I am a beginner sled owner.I don't have a choke...it uses a primer....The carbs have floats but don't seem to be sticking(I've cleaned and recleaned the carbs and the floats glide up and down fine)...I've disconnected the impulse line at the motor and no fuel coming out from fuel pump to end of impulse line..fuel does spray out of the crank where you connect the impulse line to the motor. Does that mean it could still be flooding from the fuel pump into the impulse line or no??? I am going to do a gravity test on the carbs to see if they are still the problem...just because I replaced the needle and seats with new one's doesn't mean they are working correctly. I had new parts before that where bad....just tired of pulling my guts out to get the fuel out of the crank....is there an easy way to it other than pulling your guts out??? Thanks guys and I know it's probably a stupid petty solution but I haven't dealt with this problem before