Posted 12/23/2004 7:33 PM (#5738) Subject: Front swing arm looseness
Location: Grand Marais, MN
I have a leading link fork on an EML rig, probably close to 20 years old. These are all original EML parts. There was looseness in the front swing arm. I took it apart, and am dismayed with the method of attaching the front swing arm to the down tube of the front steering fork. Instead of bearings, it is a rubber ring or tube with a metal bushing on the inside and outside of the rubber tube. It looks like an automotive shock absorber style rubber connector with metal bushing.
Over time, the outer metal bushing has worn in the front steering fork down tube. I added shims there, but this is a temporary solution.
Shouldn't this be a greasable bushing, or a roller bearing? Can I have a local machine shop re-do this, and end up with satisfactory, long lasting results? What should I request from the machine shop, in terms of type of roller bearing and such? Would a greaseable sleeve be satisfactory, instead of a roller bearing?
Posted 12/23/2004 10:28 PM (#5740 - in reply to #5738) Subject: RE: Front swing arm looseness
Location: Olympia, Washington
The MG car company called this a 'silentblock' bushing. They used it for many years. I have seen them replaced with an aftermarket bushing made with polyurethane instead of rubber. Dneprs use this kind of bushing on the swingarms also.
Posted 12/23/2004 11:05 PM (#5741 - in reply to #5738) Subject: RE: Front swing arm looseness
Location: Colorado Springs, CO
Using a plain bushing may work if properly done and replaced regularly but i don't think it would be the best. you limiting factor may be the size of the existing parts. Ask a good Machine Shop for their recomendation after you show them how it is used. They may know of a sutable bearing to use.
Several decades ago Motorvation it think it was produced a Leading Link fork with plain bearings. Those bearings didn't last long and wore out quickly. I'm not sure if it was the cheap bearing choice or cracking tubes that killed their forks.
If I could get them in there Tapered Bearings like the Beemer forks used would be my choice and that is how I have built my own for a '75 Wing.
Keep an open mind and get some input from those who have repaired them before if there around.
Posted 12/25/2004 7:57 AM (#5750 - in reply to #5738) Subject: RE: Front swing arm looseness
Location: Grand Marais, MN
Thanks for your comments. I'm remembering the Earles forks on the pre-1970 BMW's I owned, which was decades ago. I seem to recall a bearing in this location on the swing arm. The pivot connection on the EML leading link fork is not as refined as what BMW provided.
I think I'll first contact the new EML representative in FL, for his advice.