no its not boosted, when i got it someone had starved it for oil and destroyed the head , broke the cam, so i got a head off of ebay had it redone and put it back together. I thought everything was ok, no smoke no tick no knocking so i began racing it.It lasted 4 races on a 3/8 mile dirt track. Friday night after about half the race was done the carv started to slow down, the tack started jumping around, then the oil light started blinking.Wasn't sure if i should keep going or take it off the track, but it made that decision for me, in the middle of turns 1 and 2 it let go in a big cloud of smoke and quit. Just hope it didn't destroy the head i just had re done.Now i need anouther engine, damn it anyway, it was fast.