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General Category => General Discussion => Topic started by: Ameritude on January 29, 2021, 09:18:21 PM

Title: Any guesses?
Post by: Ameritude on January 29, 2021, 09:18:21 PM

Hey guys, quick question.. anybody know or have a rough estimate for a main jet on a single carb 300, gotta sled in the shop (whos brand shall not be named as it is not a kawi) that has a single carb on a 300 motor. The carb that came off of it  is a 36mm but not anything similar to the newer 36mm carb I am swapping on. Just like to know if anybody has a suggestion for a main jet. Thanks - Ameritude

Title: Re: Any guesses?
Post by: Interceptor398 on January 30, 2021, 08:32:48 AM

Not something I have played with.

Title: Re: Any guesses?
Post by: mswyka on January 30, 2021, 02:10:09 PM

Is it a single cylinder 300 or a twin cylinder 300?

If twin cylinder 300 perhaps jetting similar to single carb 340cc Drifter?  The 1980 manual that i was looking at showed a No 200 main with a 90 econojet.  So single jet size would be about 290.

I was just looking at a Skidoo manual and see that they were jetting a single carb 277cc at 220 and a single carb 377cc at 280

Based on this, for a twin cylinder 300cc engine, I would guess a jet sized 250 +/- 20 for a single carb.