polaris 250 carb jet size

chevy4x494 · #1 (**permalink**) 11-15-2011, 09:19 AM

Alright, So i've got a 1999 Polaris trailblazer with a 250 2 stroke. The only mods i'm doing to it are: AAEN torquer pipe, carb off a 400 2 stroke, green spring for the clutch.

I know that with the pipe, I would need to up the jet size 2 sizes. Does anyone know what the difference in jet size b/ a 400 and a 250 carb is?? I was figureing that I could just put the 400 carb on it and not worry about jetting it.

I know people have done this, I'm just wondering what a start point would be.

Thanks!!

chevy4x494 · #2 (**permalink**) 11-16-2011, 04:12 PM

Seriously, a whole Forum for Polaris atv's and NOBODY can give a suggestion???

polman500 · #3 (**permalink**) 11-17-2011, 12:27 PM

You need to chek out the Gen3usa.com forum site. There's lots of info on there about what you are trying to do and some really knowledgeable guys working on and running your type machine.
I'd just put the carb on and use a new plug to see how it acts before I started changing jets and tuning in the dark. Once you see how it acts and how the new plug looks you should know about how much and which way you need to go with jets, needle height and air screw.