Topic: Popping out of gear

[martini]

My 750k0 has developed a nasty habit of slipping out of fourth into neutral. Thoughts?

With thanks!

[MRieck]

Worn dogs.

[Bodi]

Worn shift drum and/or arms.
Worn gear dogs.
Weak shift drum detent spring.

Or a combination.

[martini]

For the non-mechanic, such as myself, how big a job is it replacing the dogs?

[SteveD CB500F]

For any of the above it's an engine strip.

[martini]

Yikes! Thats just what I did not want to hear.

[SteveD CB500F]

Look at it this way...

While you're in there, you can have a close look at everything else as well.

[dusterdude]

yea build an 836 while you`re there.

[SteveD CB500F]

yea build an 836 while you`re there.

Seems a bit extreme if all you've got is a few worn gearbox parts.

[dusterdude]

now cmon steve,where`s your spirit of adventure and delving into the great unknown.

[SteveD CB500F]

That's it Dusty.  The great unknown.

Why change a $200 engine strip into a $2000 big bore conversion?

[dusterdude]

awwww,im disappointed steve.

[SteveD CB500F]

My only experience with big bore kits was a 180cc CB125S I had in 1976. It was a moneypit.

[MRieck]

It's a K0. It's 35 years old. If the transmission is acting up I'm sure the engine needs freshening up everywhere. The internal rubber parts are hard as a rock. The pistons probably have about .004 of piston to wall which means new pistons anyway which also mean cylinder boring. An 836 kit isn't unreasonable at all.

[Dennis]

......... The pistons probably have about .004 of piston to wall which means new pistons anyway which also mean cylinder boring. An 836 kit isn't unreasonable at all.

 

So says the builder and Owner of the "Million Dollar CB"   

[Hop on a Honda]

Couple of Questions.
How long has the CB been jumping from the gears and how many Milles has it done?.
I had a similar problem when I first had the bike of mine.
I changed the oil to pure mineral oil no more jumping out of gear and the clutch rattle stopped so did the slippage there too.
Dave Australia.

 

[martini]

Oh Happy Day!

Last night I pulled the cover of the shift mechanism and what did I find but one of the return springs had not been put in properly. Re-seated the spring - problem solved! No engine strip down required. Now if I could only get my carbs running properly.

Thanks for the replies.

[dusterdude]

whoo hoo,way to go.now you wont have to bore steve with your 836 project.