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Title: Jackpiner bottom ends
Post by: Mickey Sergeant on July 04, 2018, 12:56:06 PM

What years if any are compatible with a 73 bottom end

thanks

Title: Jackpiner bottom ends
Post by: skiracer on July 04, 2018, 06:03:14 PM

I would think up to and including 1979......

1976 MC 5 Original Owner
1976 Penton 175 XC

Title: Jackpiner bottom ends
Post by: Mickey Sergeant on July 07, 2018, 08:48:42 PM

Maybe I didn't ask the right Question. What I wanted to know is if like the clutches are interchangeable,shift forks and tranny parts are the same for other years. Or are they year specific. Did I already get the right answer I was looking for?

Title: Jackpiner bottom ends
Post by: Larry Perkins on July 08, 2018, 09:05:35 AM

I believe 1972-1976 will interchange but it all changed in 1977 with a new design. The 72 and 73 are black motors and the outer cases are a bit different but interchange. All from memory but believe this all to be correct.

Larry P

Title: Jackpiner bottom ends
Post by: ALB on July 10, 2018, 01:07:24 PM

clutch plates are all interchangeable from 1972 thru 1978.

72-73 (black motor) shift cams and forks are the same for those 2 years.
74-78 (silver motor) shift drums and forks are the same and are also the same for the 250s and 400s.

Alan Buehner

Title: Jackpiner bottom ends
Post by: G Ellis on July 10, 2018, 02:19:05 PM

Give me a call ,I can help you out. 217 260 0237

Title: Jackpiner bottom ends
Post by: Rain Man on July 15, 2018, 08:40:47 AM

72-73 had the 12mm kicker shaft. They went to a 14mm in 74-?

Penton Owners Group

General Discussion => Penton Talk => Topic started by: Mickey Sergeant on July 04, 2018, 12:56:06 PM