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312Icarus
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MY '68 sat for many years, I rebuilt the engine last year and have ridden it a couple of thousand miles since. Once in a while, it decides to kick itself out of third gear. Usually it kicks in to between 3rd and 4th. Today it magically auto shifted completly into 4th. It seems like it happens under moderate load, but sometimes whilst just cruising along at neutral throttle. I really don't wish to completly tear down the tranny, and could be more than happy to live with it, but...since much of my riding is 35-40 mph country roads, many miles in third gear, I don't wish to exacerbate any issue.

There seem to be no other clutch or tranny issues. My sense is that it is not operator error, as it seems to shift into third just properly.

Any thoughts?

Icarus

schrader7032
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VBMWMO #7032
San Antonio, TX
Joined: 10/27/2006
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Jumping out of gear is never

Jumping out of gear is never a good thing. Just be sure that you have actually shifted positively into each gear. I don't see any quick fix...don't think additives are going to help. Likely the dogs on the gears are worn and the only fix is to rebuild the transmission.

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Kurt in S.A.
'78 R100/7 '69 R69S '52 R25/2

312Icarus
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So...since it has done is so

So...since it has done is so rely, (4 times in the last 1000 miles) should I worry about it, or am I likely to cause further damage. Oil level is good, and fresh, no other symptoms.

Icarus

schrader7032
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San Antonio, TX
Joined: 10/27/2006
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Could be that you're not

Could be that you're not getting the gears solidly to engage...likely there is some rounding of the dogs and if you don't get them to mate fully, it might slip out. I'd be watching for metallic things showing up on the drain plug and then address it then.

On my /7, I used to have problems with missing 5th gear...I'd upshift from 4th and roll on throttle only to find that I was in between gears. I still miss it once in a while but only when I'm trying to shift fast or not paying attention. I was told something which I have incorporated into my shifting on all my bikes. I continue to hold up pressure on the foot lever as the clutch lever comes out. Once the clutch is full engage, I'll back off the pressure on the foot. People talk about pre-loading the foot lever...I call this post-loading the foot lever. Consider doing something like that to give the gears the time to fully mate.

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Kurt in S.A.
'78 R100/7 '69 R69S '52 R25/2

312Icarus
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Thanks, Will try to develop

Thanks, Will try to develop the habit.

Icarus

Danedg
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The shifter forks (dogs) on

The shifter forks on my 65' were badly worn when MAX rebuilt the tranny. (It needed much love...)
We sourced a set of used forks but with much better "faces". The whole tranny was getting rebuilt, and it was recommended to me, that Max install a set of /5 "hangers" for the shifter forks, which are adjustable, whereas the /2 hangers are not. That way, the forks can be adjusted if a gear is not acting properly. Sure enuff, it would pop out of 3rd, when the bike was finally placed back in service. Back it went. (The tranny) and Jeff was able to tweak the problem, and all was good. That bike was showing 50K at the rebuild and now has 85....
It sounds like your forks are tired and not able to find 3rd properly.

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'54 R51/3, '65 R60/2, '69 R60/US, '95 Mystic, 74 MG Eldorado

312Icarus
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2 years on the kicking out of

2 years on the kicking out of third gear has gotten a bit worse. The bike runs as well as it ever has, and shifts smooth, but I’m thinking this winter it will be time to look into doing some tranny work. Question is...how much if any of this is DIY stuff (for a competent DIY guy, but not equipped with all the machinist tools). Failing that, what suggestions out there for a good shop? What do you suppose a reasonable price to pay for a complete tranny rebuild from a good running core?

Thanks

Icarus

schrader7032
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VBMWMO #7032
San Antonio, TX
Joined: 10/27/2006
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I don't consider a

I don't consider a transmission overhaul something that a first timer could do. There are some critical measurements that are needed and in some cases, a special plate is used to facilitate those measurements.

You could consider buying a used spare somewhere giving you time to consider your options for repair.

I'm thinking the cost would be $500?? I know of 1970-on mechanics but those who work on /2s is a smaller group. Well, obviously, Scottie in California can certainly do the job. Vech could do the work. You could call Barrington Motor Works and/or MaxBMW for recommendations.

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Kurt in S.A.
'78 R100/7 '69 R69S '52 R25/2

312Icarus
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Thanks, Icarus

Thanks,

Icarus

2wheelhobo
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Near Music City (Nashville)
Joined: 08/09/2018
Posts: 12
Tranny rebuild guys

Another excellent guy for /2 gearbox rebuilds is Blaise Descollonges. His website is descoatalier.com (Company is Deso Atalier). He is also in Norther California. Very detailed oriented guy, and very thorough. Highly recommended!

Pete

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Pete
Near Nashville, TN

slash2nut
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VBMWMO #5475
Chelsea MI
Joined: 10/27/2006
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Trans Rebuilds

Vech and Richard do them and do them well at Bench Mark Works.

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Dave in MI

skyler.robbins
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Joined: 09/22/2018
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Blaise..

2wheelhobo wrote:

Another excellent guy for /2 gearbox rebuilds is Blaise Descollonges. His website is descoatalier.com (Company is Deso Atalier). He is also in Norther California. Very detailed oriented guy, and very thorough. Highly recommended!

Pete

Completely agree!
Although I've not had him do any work for me, I've talked to Blaise and he is VERY knowledgeable on all things transmission.

PeterLS
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San Francisco, Ca
Joined: 07/07/2017
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Blaise

I would have Blaise and only Blaise work on my transmission. He has worked on several transmissions for me and everything that can be replaced is replaced. You will have a “new” transmission when he is finished. Reasonable price as well. I don’t think other restorers are as meticulous as Blaise and some charge more.

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1953 R51/3, 1953 R51/3, 1959 R69 (original paint), 1961 R69S, 1966 R60/2 w/ Steib S501, 1968 R69S

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