72 vs 74 175cc motor

[fastwillie8568]

is there a difference between 72 and 74 175cc motor my 72 jackpiner seems quicker is there any difference between them besides  black and siler and the side side cover?

[brian kirby]

The '72 frame is quite a bit lighter and the steering angle is tighter, that could be it. I also have a '72 and a '74.5 and the black engine '72 feels faster, but I dont think it really is.

Brian

[Kip Kern]

Transmission components are different

[454MRW]

I wonder if it is like on the 73-74 KTM 250 engines, where the primary gear ratio between the crankshaft drive gear and the clutch basket gear is a sligtly lower gear ratio on the 73, which allows the engine to rev slightly faster, as I have heard the same comments about the 73 250 Harescramblers? Mike

Michael R. Winter
I enjoy rebuilding and appreciating Pentons!
1974 250 HS Pentons-1980 KTM 175-400'S
1975 Can Am 175 TNT & 77 250 Black Widow
1979 Husqvarna OR390
1976-78 RM & 77-79 PE Suzuki's
1974 CR250M 07 CR125R 79 CR250R