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Old 03-02-2011, 07:41 PM   #91
facetjoint
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Quote:
Originally Posted by Multisurface Rider View Post
Good luck with your back surgery. I had back surgery in the 90's, L4 & L5.

You will probably find something simple is kicking your butt on the tranny, I hate it when that happens.
Thanks for the good wishes. I hope it is something simple. There are time and it has happened to all of us I am sure. To pick up all the tools and put them all back in the tool box. Shut the lid. Then walk away from the thing for awhile. In my case I am going to be forced to.

As far as the surgery. Mine is T4/5, T7/8, T8/9 and T9/10. So 24hrs. from now I'll be a hurtin' unit for sure.

Thanks again, Bill
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Old 03-03-2011, 08:53 AM   #92
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Since your having back surgery, good luck, but two things about the tranny come to mind. First, could the shifter drum be upside down? I've rebuilt several Japanese bike transmissions where the shifter drum can go in either direction and look right, but not work. The other thing is could the drum be turned the wrong direction relative to the shifter pawls? Simply out of phase with the correct alignment.

Heal quick.
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Old 03-04-2011, 12:38 PM   #93
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Thanks for the kind words on the back issues. I'm a hurting unit. Let me see if I can get my drug induced brain to get the typed words to the tips of my "fangers." The shift drum can only firs in one way. It has a small shaft that has to fit through the back of the case that the gear position indicator switch attaches to. This switch tells the V.D.O. on the instrument cluster which gear you are in. The drum can only line up in one position to allow the shift forks to be aligned on the drum. But and this is a big but, there is no mechanism to shift the trans when the shift shaft assy. is installed, It has to be something simple that I am just not seeing.

Maybe I ought to do the old Doctor trick and toss a few of the pain pills inside the transmission and have it cal me in the morning to tell me how it feels.

Later, thanks Bill
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Old 08-16-2011, 04:13 PM   #94
Vaskar
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My 96 1100GS has a 2 second power loss, with 3rd gear when I open non-smoothly the throttle. This happens now for over 3 years. What do you suggest ?
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Old 08-17-2011, 07:23 AM   #95
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Originally Posted by Vaskar View Post
My 96 1100GS has a 2 second power loss, with 3rd gear when I open non-smoothly the throttle. This happens now for over 3 years. What do you suggest ?
I am not sure if I understand exactly what yo are saying?

Power loss would be in the motor, but you mention 3rd gear. Could you try to discribe again?

Mine would happen in 3rd gear after down shifting to 3rd, then picking up speed and just before you shifted to 4th it would have a momentary skip (this is when the dog gears would slip and catch on the next dog gear). It felt as though you grab the clutch and then release it real fast, but felt harsher than what you can do with the clutch, you can tell it is the transmission, it would hit pretty hard. I had a M94 transmission in my bike. I ended up buying a used M97, no more problem.

Look and see what the manufactures date is on you bike. Look here: http://www.largiader.com/tech/oiltrans/

BMW fixed this problem with the M97. The gears are undercut and when under pressure lock together not letting it skip.

Let me if this helps you or if you have more questions.
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Old 08-17-2011, 12:40 PM   #96
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Quote:
Originally Posted by Multisurface Rider View Post
I am not sure if I understand exactly what yo are saying?

Power loss would be in the motor, but you mention 3rd gear. Could you try to discribe again?

Mine would happen in 3rd gear after down shifting to 3rd, then picking up speed and just before you shifted to 4th it would have a momentary skip . It felt as though you grab the clutch and then release it real fast, but felt harsher than what you can do with the clutch, you can tell it is the transmission, it would hit pretty hard. I had a M94 transmission in my bike. I ended up buying a used M97, no more problem.

Look and see what the manufactures date is on you bike. Look here: http://www.largiader.com/tech/oiltrans/

BMW fixed this problem with the M97. The gears are undercut and when under pressure lock together not letting it skip.

Let me if this helps you or if you have more questions.
Feels exactly like you describe. Like I grab the clutch. But there is no noise, or anything else. Happens only in 3rd gear. Almost always but (I think) at specific rpms no mater closing or opening the throttle. But happens 100% when I open the throttle hard.
This is happening for 3 or 4 years now and never the gear came out or get worst.(with noise or sth else)
I think I felt it in 5th once last week.
My mechanic told me to change the transmission when the gear comes off.
I'll see the number tomorrow and Ill tell you.
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Old 08-17-2011, 01:23 PM   #97
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Quote:
Originally Posted by Vaskar View Post
Feels exactly like you describe. Like I grab the clutch. But there is no noise, or anything else. Happens only in 3rd gear. Almost always but (I think) at specific rpms no mater closing or opening the throttle. But happens 100% when I open the throttle hard.
This is happening for 3 or 4 years now and never the gear came out or get worst.(with noise or sth else)
I think I felt it in 5th once last week.
My mechanic told me to change the transmission when the gear comes off.
I'll see the number tomorrow and Ill tell you.
Transmission jumping out of gear and back in happens with a jolt and a momentary loss of power to the rear wheel. However, it is nothing like 2 seconds as you described but more like 1/10 second. Most people describe it as feeling like a missfire.

If this is your problem, yes it does usually happen at the same rpm every time, and usually while accelerating. If you keep riding, it will probably start happening in second gear.

Repair is a specialist job costing around $700 (more if you have damaged other components.) There are only a few people who can do it and your local BMW shop is probably not one of them. Alternative is replacement with a good transmission. Any other R1100 transmission, except the R1100S, will bolt right in.
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Old 08-17-2011, 03:12 PM   #98
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Two ways to fix this and I hope you are mechanically inclined, if not reach deep for someone to tear it down for you.

1. Tear it down and send the gears to Bruno or Anton to have them undercut the dog gears. If you send them the tranny it will cost you a lot more coins.

2. Buy a used transmission like slartidbartfast said " Alternative is replacement with a good transmission. Any other R1100 transmission, except the R1100S, will bolt right in."

Bought my tranny off ebay, came out of a 99 R1100R, works perfect. Make sure it is a M97, you have a M94 in your bike. Another M94 will work if it has been repaired by Bruno http://www.brunos.us/ , Anton http://www.largiader.com/index.html or Ruber Chicken Racing http://rubberchickenracinggarage.com/index.html. I talked to Bruno on the phone and he told me exactly what the problem was, "The gears are not undercut on the M94 transmission".

It will take some time to tear down and put back together. The easy thing to do is have another tranny ready to slap in when you tear it down.
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Old 08-17-2011, 07:23 PM   #99
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Has anyone tried the "Dremel Fix" used for the old XS1100 Yamahas http://www.xs11.com/forum/showthread.php?t=5090. I've just done this on my XS1100. Not too hard to do and it works. Seems like the 1100gs has a similar problem with the dogs on the gears as well and a little bit of grinding to back cut them might work. Incidentally, I have a 95 1100GS as well. No tranny probs yet at 143000 km but I expect the day will come. Phil
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Old 10-01-2011, 05:50 AM   #100
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Very interesting link on cutting the gears with a dremel. If I got the gears out I would probably send them to someone who has cut gears before... probably not that expensive just sending the gears?

I have a question about the non-undercut gears. If the transmission is just slipping out of gear in 2nd/3rd, it seems like this is not likely to cause other problems, in and of itself. I guess the slipping could cause a little more metal to grind off into the oil, but I don't see how that's any worse than the normal act of shifting. It certainly shouldn't cause undue wear on the forks or bearings, unless they were shimmed wrong to begin with.

I guess what I'm saying is, the problems of popping out of gear seem unrelated to the catastrophic transmission failures referenced elsewhere. It seems like it should be fine to baby the transmission for a long time, at least until you have a spare set of undercut gears ready. Am I wrong on this?

Thanks for the info in this thread!
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Old 10-01-2011, 06:20 AM   #101
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I have been babying mine for over a year. I think the kickback causes the shiftfork to deform. I have a M97 transmission waiting to go in when and if the 94 goes tits up. '96 RT.
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Old 10-01-2011, 03:34 PM   #102
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Quote:
Originally Posted by katumo_jtb View Post
Very interesting link on cutting the gears with a dremel. If I got the gears out I would probably send them to someone who has cut gears before... probably not that expensive just sending the gears?

I have a question about the non-undercut gears. If the transmission is just slipping out of gear in 2nd/3rd, it seems like this is not likely to cause other problems, in and of itself. I guess the slipping could cause a little more metal to grind off into the oil, but I don't see how that's any worse than the normal act of shifting. It certainly shouldn't cause undue wear on the forks or bearings, unless they were shimmed wrong to begin with.

I guess what I'm saying is, the problems of popping out of gear seem unrelated to the catastrophic transmission failures referenced elsewhere. It seems like it should be fine to baby the transmission for a long time, at least until you have a spare set of undercut gears ready. Am I wrong on this?

Thanks for the info in this thread!
I think you will be ok if you do baby it, I couldn't wait. Get some gears and go for it.
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Old 10-01-2011, 03:35 PM   #103
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I have been babying mine for over a year. I think the kickback causes the shiftfork to deform. I have a M97 transmission waiting to go in when and if the 94 goes tits up. '96 RT.

You are ready to go, get er done.
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Old 05-01-2012, 08:00 AM   #104
russellkt
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I just bought a 1996 R1100GS and have the dreaded skip in 3rd gear problem. I've ordered a M97 from a 1998 R1100RT.

Is it a direct swap for the M94 that I currently have?

How many hours does it take an average person to swap the transmission?

Thanks multisurface rider for starting this thread.
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Old 05-01-2012, 08:08 AM   #105
UncleMark
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The M97 transmission was a direct swap for me, with my 95 GS. I can't speak for average, but I didn't complete it in one day, though I expect I could have. I didn't have any trouble fininshing up on Sunday.
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