Re: Blaster jetting?
Well, I know most others will probably be annoyed for telling you this, but I would guess about 300-320 main.
You must be sure the motor passes a leak test and that float level is correctly set, then after trying a new jet, do a plug chop.
Every motor has its own sweet spot where it would like to be jetted, and there are MANY things that influence it to.
Please note the following: Too small jet = fried motor!!!
And hey, its not my motor thats going to get fried if you don't take all the good advice already given...