Friend of mine has this motor an he says its got good compression and it starts an idles great but when u giv it gas it starts smoking bad real bad. It doesnt fowl plugs but the smoke pours out. Lower back down to idle an it does fine. Somebody told him that some vent is pluggd is the reason its doin this. Im no mechanic so im hoping someone can tell me if there is any truth to this? Im interested in buying the motor