Any guesses?

[Ameritude]

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

[Interceptor398]

Not something I have played with.

[mswyka]

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.