NEED SOME ADVICE, I GOT A 1978 ARCTIC CAT JAG 3000 2 CYLENDER SINGLE CARB WITH 1200 ORIGIONAL MILES. JUST KEEP IT AROUND FOR KIDS TO PUT AROUND ON. SLED DONT LIKE TO IDLE- I GOT TO RAISE IT UP TO HIGH TO KEEP IT RUNNING AND IF I DROP IT DOWN TO WHERE IT SHOULD BE IT WILL STALL AND IS TOUGH TO START- IN FACT IVE FOUND HOLDING IT WFO HELPS TO GET IT RUNNING AGAIN.AFTER SEVERAL PULLS IT WILL FINALLY BLUBBER ITSELF TO LIKE AGAIN BUT DONT STALL IT! IVE CLEANED THE ENTIRE CARB. I WAS MAYBE THINKING FUEL PUMP OR CRANK SEAL?? WHAT DO YOU GUYES THINK? KIDS GET MAD BECOUSE I GOTTA BE HOME TO GET IT RUNNIN- THEY AINT INTO WAITIN FOR THE OLD MAN TO GET HOME TO RIDE. ANY ADEAS-- THERE ALREADY ASKIN TO GET IT READY. WONDER WHERE THEY GET THAT FROM

Check the crank seals. Most likely they need to be replaced. Start the sled and spray a small amount of carb cleaner next to the PTO (clutch) crank seal. If RPM's go up, that seal is bad.
Check the MAG seal and see if there is evidence of oil leaking from the seal. If so, that seal is bad. If you are going to replace one seal, it would be wise to just replace both because of the age of the machine.

Check fuel lines for blockages and cracks.

I don't know if this sled had a remote fuel pump or if the fuel pump was part of the carb. If it is remote, check the impulse line for cracks. (line from crankcase to fuel pump).

A carb rebuild kit would most likely replace worn out jets, hardened seals and o-rings. Diaphrams and gaskets also probably need to be replaced

Check the exhaust for blockages. (mouse nests)

Check the air intake system for blockages. (mouse nests)

Good luck :div20: keep us posted

ps... take the CAP lock off

the very first thing to check is the compression. :beerchug:
pretty much everything haricat said. also have a look see at the reeds, cracked, worn or chiped petals can cause what you're discribing. when we "cleaned" the carb. did you make sure that all the little bleed holes were clear? were the pilots adjusted correctly?

this is a piston port engine, not a case reed. 2 cylender single carb susuki. i did however clean carb 100%. i may puts with it in the next couple of weekends i will get back. thanks for the advice!!