Well its hard to pull for 1 and it's very sensative to the choke. I may have to change the needle and seats as one of the other topics indicates. I've just replaced the entire engine and had it running a couple of months ago. If its not running now, likely it will be hard to start at 10F.
if your sled don't start in 3 pulls in normal temps or 10 pulls at cold (-20F) temps, somethin is wrong with either your technique, or your carbs.
cold start warm day:
set enrichener (it's not a choke actually).
pull till it fires, when it fires, turn off choke, see if it will idle. if it idles then dies, try with a little enrichener.
cold start normal day
same as above, but you can leave choke on usually till it warms up some
cold start cold day.
same as above, usually takes a couple more pulls, but still should be trying to fire after 4-5 pulls. DO NOT OPEN THROTTLE. Crack it a little if you need to, but opening the throttle with the enrichener on will defeat the enrichener, and it will not draw extra fuel.
Warm starts any temp, pull a few times without the choke. If it doesn't run, then add a little enrichener. It shouldn't take much though.
If your sled takes WOT to start ever, and makes alot of smoke, start looking at a leaky fuel pump diaphram, or leaking needles/seat combo.
Fire up the sled let it run for a few minutes. Then shut it off with the kill switch, and leave it for at least a couple hours. Now, pull your plugs (with the ignition off), and pull the motor over. If any more fuel than a mist shoots out the plug holes, they need replacing.
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