1980 Enticer 340 Carb Question

[Weez1]

I've had this same problem since I got the sled a few years ago. Now that my wife drives the machine I'd like to try & fix it, any help would be nice.

On cold start up with choke the machine starts well. As it warms up with choke on 1/2 it starts to die so I flip the choke off. but the idle is really low. In order to get it going i have to play with the choke on and off for the first minute or so until it runs good. I turned the idle up a little so it idles good after a minute of running from cold start up but then when the engine is up to normal operating temp the idle is too high, any ideas?? thanks.

 

[Ding]

Did you carefully clean the carb? The pilot circuit?

 

[Maim]

i think it is the nature of the piston port motors. must have had 12 540/400/340/300/250 yamys in the family over the years and with squeaky clean carbs, they all did this. dad and his brothers used to warm them up with a stick or peice of wire to hold the throttle open to warm the sleds up with the track off of the ground. many times out at camp at -40c. you ever try to pull a 540 over at -40? swear you are going to break the pullcord even on the high mile sleds.