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312Icarus
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Joined: 07/15/2016
Posts: 301

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
Posts: 6423
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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VBMWMO #7032
San Antonio, TX
Joined: 10/27/2006
Posts: 6423
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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Posts: 301
Thanks, Will try to develop

Thanks, Will try to develop the habit.

Icarus

Danedg
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Joined: 12/25/2008
Posts: 42
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

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