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This post was updated on .
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Administrator
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I have never heard of a 4 speed CB 750. Maybe he has a bent shift fork?
TOOLS
Life is not about the number of breaths, you take, but the moments that take your breath away.
I don't have an anger problem. I have an idiot problem. Hank Hill
Never confuse education for intelligence.
Happiness is a belt fed weapon.
I just can't imagine what could go wrong.
No fire? No explosions? So whats the point of your story?
Those who are too smart to engage in politics are punished by being governed by those who are dumber. ~Plato
It couldn't be done, but the darn fool didn't know it, and did it anyway.
We all got problems. Ksharp
I like vintage bikes because they take me away from the clutter of technology that I work with everyday and back to a simpler time of mechanical elegance and simplicity.. "ninadm"
Darkwing Duck: The worst part of public transportation is the Public.
"That is awesome shit there" Re-Run
"Fear nothing, attack everything" Eric Berry
" Oh, you read that on the internet? Clearly it IS a massive problem. Of course it CAN’t be normal operation."
1976 CB 750-A X 2
1977 CB 750-A X 4
1977 CB 750-K
1976 CB 750 F
1981 CB 750
1966 Kawasaki SG 250
1981 KZ 750 LTD
1973 CB 350
1979 CM 185 Twinstar
1982 Honda XL 80
South of Eden (Kansas City MO)
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Yep bet his(shift) dog broke a bone,The shifting shaft going into the tranny can be bent,not allowing full travel ,dam it could be bad maintenance ...piute..
1977 CB750 F2 Super Sport
<LET THOSE WHO RIDE DECIDE><RIDE TO LIVE-LIVE FOR JESUS>
Native American from central Cal, Kickstand UP in S.W.Missouri,
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Administrator
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Can it be straightened or does it need replacing?
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Administrator
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I would turn the engine over, and split the cases to check it out.
TOOLS
Life is not about the number of breaths, you take, but the moments that take your breath away.
I don't have an anger problem. I have an idiot problem. Hank Hill
Never confuse education for intelligence.
Happiness is a belt fed weapon.
I just can't imagine what could go wrong.
No fire? No explosions? So whats the point of your story?
Those who are too smart to engage in politics are punished by being governed by those who are dumber. ~Plato
It couldn't be done, but the darn fool didn't know it, and did it anyway.
We all got problems. Ksharp
I like vintage bikes because they take me away from the clutter of technology that I work with everyday and back to a simpler time of mechanical elegance and simplicity.. "ninadm"
Darkwing Duck: The worst part of public transportation is the Public.
"That is awesome shit there" Re-Run
"Fear nothing, attack everything" Eric Berry
" Oh, you read that on the internet? Clearly it IS a massive problem. Of course it CAN’t be normal operation."
1976 CB 750-A X 2
1977 CB 750-A X 4
1977 CB 750-K
1976 CB 750 F
1981 CB 750
1966 Kawasaki SG 250
1981 KZ 750 LTD
1973 CB 350
1979 CM 185 Twinstar
1982 Honda XL 80
South of Eden (Kansas City MO)
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Whoa!  Okay,nevermind.Over my head.I'm still asking questions about wheels...splitting cases?!?! Give me a few more months 
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Now one of the others may say N no off the top but there should be A adjustment inside or it's got a tensioner,theres 3 "shift forks",and the book shows that you can get to the shift mechanism but thats it,just like a sporty,BUT can split cases without taking top-end off it says "not me"I've totaly rebuild a 5 spd.H.D. very simple 3 shafts,gear / compensating gear shift dogs,..Piute..
1977 CB750 F2 Super Sport
<LET THOSE WHO RIDE DECIDE><RIDE TO LIVE-LIVE FOR JESUS>
Native American from central Cal, Kickstand UP in S.W.Missouri,
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The only way to get at the shift forks would be to take the motor out of the frame, turn it upside down and remove the lower crank case. Then you would have to very carefully check the shift shaft, the forks and the dogs on the gears for wear unless there was an obvious issue like a broken fork or dog. Not a difficult job, but fairly daunting if you haven't gone that far before.
I'm wondering though, if it could be a problem with the external shifter mechanism which is easy to get at by removing the gear shift engine cover. I would start there first but I'm interested to know what others think/have experienced.
Sorry for rambling but when I was 18 (seems like another life), I had a CB250 with the same problem, in that case, no fourth gear. I never did fix it but I can't say I tried very hard.
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Thanks for the info guys.I'd like to help this guy as much as i can.Very limited knowledge on my part
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PS, there is no adjustment on the forks, or anything else inside the transmission. The parts are either un-damaged, and in-spec, or they are not. The only thing you can do about it, if they are not, is replace them.
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 Okay.Thanks for the info guys.I hate not being able to fix it for him,but at least we know what direction to go now.Only other guy i know that has a cb750,local,cant wait to go riding with him
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Winters Coming,Flip that baby over and learn whats in there 1st hand,Seems most of it is time,"You can Do it Man"
After you get yours back to gether ,R&R wont be a prob....Piute N Judose....
1977 CB750 F2 Super Sport
<LET THOSE WHO RIDE DECIDE><RIDE TO LIVE-LIVE FOR JESUS>
Native American from central Cal, Kickstand UP in S.W.Missouri,
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your right about that no better way to learn than to just dive in.
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If you want a cheap insurance policy there's a set of shifter forks and a shifter drum on eBay for $37. Ends around noon Eastern time today
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Yeh ! Have that wheel guy pick that up off the flea if he can ,hold onto them for when you start digging,
at that price and there good,some-one else may need n buy.That time of year plenty will be digging .
Not knowing much hope it's not me,YET! Every -ones tym will come if you ride them...Piute...
1977 CB750 F2 Super Sport
<LET THOSE WHO RIDE DECIDE><RIDE TO LIVE-LIVE FOR JESUS>
Native American from central Cal, Kickstand UP in S.W.Missouri,
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