10 mil vs 14 mil price difference is nothing hardly. I dont know why people keep building these huge motors and then go get their asses kicked by 4 mils 98 percent of the time with a hard to tune, clutch breaking, crank wrecking pieces of crap. I havent seen maybe 10% of the 14 mil or bigger stroke motors that havent broke once or twice before they were tuned. If you have tuned and wore out a few cubs then move on to bigger stuff. Otherwise do what most of the non broken ones have done and buy it all new , have it all tuned and setup by a builder and shipped to you.