The New And Improved Unofficial R65 Forum V2

Technical Discussion => BMW Technical Q&A, Primarily R65 => Topic started by: raygun on June 16, 2007, 11:05:25 PM

Title: New R65 owner in need of help
Post by: raygun on June 16, 2007, 11:05:25 PM

In the last month I purchased a 1979 R65. Today when my son took off on it, it slipped with a grinding sound. I tried it, and as long as you would take off very gently it would not grind and slip. But when you would accelerate with a little more force it would slip. It would do this in all gears. As long as you accelerate gently no problem. Any ideas. Your help is greatly appreciated. Ray

Title: Re: New R65 owner in need of help
Post by: Bob_Roller on June 16, 2007, 11:26:04 PM

You need to locate the area of noise, clutch/transmission  area, or the rear wheel. I would suggest you not ride the bike until you find the source of the noise. Common failures are the transmission input shaft spline, possible clutch related problem, or a pending rear drive output spline failure

Title: Re: New R65 owner in need of help
Post by: raygun on June 17, 2007, 12:00:23 AM

Bob, it is in the clutch tranny area nearest I can tell. It seems to slip easily under power, but when I put it on the center stand I can turn the motor over with rear wheel and it wont grind or slip.

Title: Re: New R65 owner in need of help
Post by: airhead on June 17, 2007, 03:27:10 AM

Sounds like it's the clutch splines, an often neglected area of maintenance. The splines need greasing, the frequency up for debate, but at least every two years or 10000ml is a starting point.
It may just be the clutch splines gone, in which case you are only up for a new driven plate. If it's the gearbox input splines, then I'm afraid it's a new shaft and a total gearbox strip (well, at least enough to get the shaft out, but while there a good time to overhaul it). Not cheap if you are getting someone else to do it, so a known good SH box may be the answer. You can also probably pick up a good SH input shaft.
You can only tell for sure what is gone by pulling the box from the engine, no biggie, but how are your wrenching skills? Keep us informed as there are some traps for unwary players if you haven't worked on Airheads much before.

Bill.....................;-)

Title: Re: New R65 owner in need of help
Post by: Justin B. on June 17, 2007, 08:30:08 AM

I concur with Bill.  Another set of splines that needs periodic attention are the rear wheel splines.  Clean and re-lube the rear wheel splines with every tire change.  It's probably time to start looking around for a good used trans...  :(

Title: Re: New R65 owner in need of help
Post by: raygun on June 17, 2007, 08:37:31 AM

Bill, until Oct of '06 I knew nothing of BMW. That is when I purchased my first BMW an oilhead. I am however fair mechanically and will be doing the work myself. So any tricks or advice will be a tremendous help. Bring 'em on Ray

Title: Re: New R65 owner in need of help
Post by: thrang on June 17, 2007, 09:48:58 AM

Sound like the clutch splines to me as well.

Title: Re: New R65 owner in need of help
Post by: MrRiden on June 17, 2007, 10:29:01 AM

I will concur with my fellows here and vote for the clutch splines. Heres a nice photo essay on how to give 'em a peek.http://www.webbikeworld.com/t2/spline/
If you find the splines are damaged you'll be part of the way done in removing the trans using this procedure. Keep us posted!
rich