well, most bikes right out of the factory are set lean, and by you removing the spark arrestor it will create more air, air to fuel mixture is offset, resulting: possible engine damage.
but, i had an '04 150, put a big gun race series exhaust, ran it for about 4 months and no engine damage.?
dads always going to buy the next one right? hehe.
but, yes it would be safe(r) to rejet.
