best engine to put in a blaster

If you got a welder and the mechanical abilities anything can be dmade to work.

At one of the local pony express days i seen a hyabusa powered i belive it was a raptor and it didnt look all hacked the guy did a nice job installing it.

Basically what im saying is this bro the only bolt in motor is the yfs 200 you already have EVERYTHING else you question about bolting in is all up to your skill level and acess to supplies and tools.
 
heard the 490s had issue with cracking the cases and breaking 2nd gear. maybe look into a 250cc engine.
or maybe you could stuff a new 450cc engine into there?

think i heard 450's r too tall. although someone on here put a 250f motor in one. said it was same as a 250 2 stroke but you don't have to worry about changing the pipe to make it work. looked like a really really clean swap. motor might be pricy tho