Print Page - Greetings from the Arctic otherwise known as PA

Title: Greetings from the Arctic otherwise known as PA
Post by: George Swan on January 28, 2014, 08:05:35 PM

Questions Penton friends I am in need of your experience. Can someone post what A '76 MC5 swing arm bearing looks like... or better yet the swing arm bore without a bearing. A am worried I am grinding to far but I am working sort of blind with no past experience being this bike is one year younger than I am lol. Advice and banter wanted!!! [:I]

1976 Penton MC5 400 Frame # 1871

Title: Greetings from the Arctic otherwise known as PA
Post by: 454MRW on January 28, 2014, 09:28:36 PM

The swing arm caged bearing is in a fairly thin shell, but the ends are curled up to hold the needle bearings in place and they are tough to grind. If you grind through to the actual swing arm the bearing will expose a sharp edge, and usually release from the swing arm where you can catch the edge with a chisel and pry it up and collapse the shell and remove it easily. If you grind a little groove into the swing arm, it usually won't adversely affect the new bearings ability to fit tightly and perform as intended. 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

Title: Greetings from the Arctic otherwise known as PA
Post by: rob w on January 28, 2014, 09:40:29 PM

More images here -> http://www.pentonusa.org/forum/topic.asp?TOPIC_ID=12282

(http://i52.photobucket.com/albums/g8/BobWardlow/POG%20pictorial/mz6C0hzLZ7HSYH3vFG69nXg_zps0738302f.jpg)

(http://i52.photobucket.com/albums/g8/BobWardlow/POG%20pictorial/images_zpse46e5c1f.jpg)

Title: Greetings from the Arctic otherwise known as PA
Post by: George Swan on January 29, 2014, 07:47:40 AM

You guys are the best... I see what I need to do now... Thank you and stay warm!!! :D

1976 Penton MC5 400 Frame # 1871

Title: Greetings from the Arctic otherwise known as PA
Post by: Mick Milakovic on January 29, 2014, 02:50:29 PM

Bob, the bearings and seals in the picture are from an eBay auction for Husqvarna swingarms from 77-84:

http://www.ebay.com/itm/370967254448?_trksid=p2055119.m1438.l2649&ssPageName=STRK%3AMEBIDX%3AIT

Do they also fit the Penton swingarms?

Mick

Title: Greetings from the Arctic otherwise known as PA
Post by: KJDonovan on January 29, 2014, 03:43:15 PM

Mick,

These are the ones for Penton 1975+ swingarms.

http://www.vxb.com/page/bearings/PROD/Kit7511

Kevin J. Donovan
Foster, Rhode Island
72 Jack Piner (My Ride)
72 Six Day (Wifes Ride)
71 Suzuki TS125
72 Montesa Cota 123

Title: Greetings from the Arctic otherwise known as PA
Post by: George Swan on February 02, 2014, 07:49:18 PM

I got them out with a carbide grinding burr. Easy as pie once I knew where to stop. My bearings were a single unit on each side that were double row wide, not two separate units stacked side by side. I assume this is no longer available? I am finally ready for blast and primer.

1976 Penton MC5 400 Frame # 1871

Penton Owners Group

General Discussion => Penton Talk => Topic started by: George Swan on January 28, 2014, 08:05:35 PM