I just received an extra 250 motor for my Polaris Trailblazer. I am looking at building a 7mm stroker motor out of it and boring it out .40. I am fairly mechanically inclined. I am an Aircraft A&P Mechanic and have built several engines. Who sells stroker cranks and rods? I've go a flow bench at work and a good bud who knows how to port two-strokes. I'll bore the jug myself.

 

www.azbadboyz.com

 

You will also need to do the reed conversion

 

Last week I had ordered a Banshee Reed Cage off of ebay. I got it on Thursday. It took a little while to get it fabed right, but man what a difference a reed conversion makes.

 

whats the jetting set at? how fast does it go? could u give some step by steps of how u did it? thanks, scott

 

I'll take some pics this evening. With the Reeds the engine is much more responsive.

 

I also had to replace the Carb with a 34mm off a scrambler. I did not try it with the original carb. I don't think the original carb has enough in it to keep it fed.

 

did u get my pm davesp???

 

OK I have a question here. Will the crank assembly off a 300 xpress fit the 250 case. I see the bearing's for the 250 and 300 crank assembly are the same. I noticed the Rods are the same as well. With the 300 crank it will give me 5mm's more stroke. I could machine an extra 5mm spacer between the case and jug. That would give me 264cc's with std bore, and later down the road I could put a 300 jug on it.

 

it sounds like it would work fine, as long as u made sure the spacer was perfect cuz even if it was a little off it would throw the ports off line.