yz85 motor?

no... don't do it...

not unless you have to.... you are better off with a stock blaster engine
 
Probably built for a 90 mod class. Keep the stock blasty motor for wider powerband

yep... our 90mod is useless unless you are on the powerband lol but if you can keep it up there it is pretty insane that a little 85 can be that powerful
 
A YZ85 singin it's sound is a great sound but you would have to really work the shifter to make it faster then a easily modified 200 Blasty.
 
Yeah, I saw a yz85 motor in a blaster one time on Craigslist and I think they raced it in a 90cc class and or something like that...but I think they wanted like 2000 dollars or something like that. It had tons of mods on it though.