Carb tuning?

916 Views 4 Replies 3 Participants Last post by spaceman, Jan 6, 2002

rodmax

Discussion Starter · Jan 6, 2002

Sled runs rough , Idles good but when you want to go first half of the throttle it is rough and sputters,untill you get about 25mph then all is well.
Sled= 1991formula plus 521cc

SKI DOO all the way there AND back

Save

1 - 5 of 5 Posts

Skrplyr23

· #2 · Jan 6, 2002

Low end to midrange runs off the pilot jet and high end is your mains. Does it seem to have too much gas at low end or to little? If it ran fine last year i would just think that you have some bad gas or a partially plug jet. Try cleaning your carbs and check how well the needle valve is seating.

See less See more

Save

spaceman

· #3 · Jan 6, 2002

sounds like its toward the mid range. clean the needle jet, its what the jet needle rides in, and it easily clogs and its hard to clean. take out the main jet and then pull the top off the carb and carefully pull the needle jet out of the top with a needle nose pliers. Don't twist it ,just pull lightly. dont bend it !Put it under a bright light and look inside for crap. Use carb cleaner or acetone and compressed air. You know , ALL sledheads need to know how to do carb cleaning cuz it causes more trouble than anything else on a sled. Let me know what you find!!

Spaceman
Mean Green Racing
Elyria, Ohio

Save

Skrplyr23

· #4 · Jan 6, 2002

Good info spaceman but the needle jet just maintains a steady amount of fuel in the float bowl. He said that top end was the best part of the whole powerband, so this means he is getting fuel. needle jet passages are just from the fuel line to the float bowl, no where else.

See less See more

Save

spaceman

· #5 · Jan 6, 2002

No , not the needle and seat ,I'm talking about the needle thats attached to the slide which is attached to the throttle cable and regulates fuel through the main jet from partial throttle to wide open when the main is regulated by its size

Spaceman
Mean Green Racing
Elyria, Ohio

Save

1 - 5 of 5 Posts

This is an older thread, you may not receive a response, and could be reviving an old thread. Please consider creating a new thread.

Top Contributors this Month