Is that the nut you're talking about? It says its for .12 engines but I'm not sure if it would work on a .15 engine. The .12 and .15 OS series use the same exact crankcase so that's why i'm wondering. And would I have to get a certain flywheel and clutch assembly or is the HPI setup i'm using okay? I'm just wondering because the HPI flywheel has a raised lip area seen here
and I just want to be sure that it will leave enough space on the shaft. If the HPI one is fine, would I have to get a new collet?