Thanks Al, and Les. Yeah, the lower crankcase/pan part, with the pump and filter, is what I have, along with 2 splash lube motors. I'm having a hard time, using the manual, finding which parts are different, and which are common to both versions. I'm new to lawn mowers, and no one is racing them in NM. yet. The adj. HS jet thing is me simply not wanting to re-invent that particular wheel. No problem making jets and needles. After all, 'It ain't rocket science.' (Jet science?) Anyway, if anyone chooses to share any oppy science, I'd appreciate it, and I'll do the same. If not, I understand. Thanks, H.