The 04's came stock with 510n mains, rediculous rich. At around 1000 ft of elevation they can be safely jetted down to 460 mains with the needle dropped one position (raise e-clip) to lean out the midrange some. Mine & my brothers are jetted this way & we have rode in temps well below zero with no problems. This set up really cleans up the running quality & makes the carb f7 run the way it should. :div20:
When I first got it it was the worst. I brought it back to the dealer a couple of times and they tried to fix it but failed. I havent done anything to the secondary clutch or the jets yet. I'm gonna get on it shortly, I just wish that I knew which it was. It could very well be the oil pump too because she smokes blue in deep snow. What does the secondary clutch update involve?
The only secondary update I know of is with the 05 sleds. The stock clutching on the 04's is pretty darn good. If your dealer jetted it down to 480's with the update it is still to rich. Pretty much any carbed sled will smoke & blubber a little after it has sat & idled for a while but it should not while your actually under power. Jet down to 460's & raise the e-clip one spot, it'll make a huge differance.
I had the same problem with my 04 f-7 carb, last year. I though all kinds of things, but it turned out to be water in the carbs. I thought some dry gas would solve the problem, but it didn't. I removed the carbs and fuel lines and flushed with carb cleaner, problem solved.
For some reason water was much harder to remove than any other sled i have owned.
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