BlackJack 26 Boat????
#2
I guess water does count as "offroad" as its not on the road but still...
That engine is probably designed to run with 20%. Check the manufacturer web site to be sure. If you run 30% add a .1mm head shim.
That engine is probably designed to run with 20%. Check the manufacturer web site to be sure. If you run 30% add a .1mm head shim.