Clutch Spring Differences CA77

[brewsky]

Thanks again Ed for all your help!
The reason I get so paranoid over clutches is the experience with my 76 and 78 CB750K models.
Both have similar looking clutches, but with slightly different pressure plates, basket depths, push rod lengths, different plate numbers and 3 different spring lengths.
By the time I got back to re-assembling my 78 the parts were all mixed together and I realized I should have marked and bagged them individually!
It took several attempts to get it to work properly!
Now back to the garage to get all that power to the ground!
But It's snowing AGAIN, 80+ inches this year so far so who knows when I'll get to try it out again!

[davomoto]

I agree with Ed that the springs with the white paint are the best to use. I have run out of them, and am always trying different springs.

davomoto

[teazer]

I wish I could remember. I'm sure I still have a spare set back in Australia. next time I'm back there I'll have a look. They were long enough that they had to pressed in to get the bolt started and they came with thin steel top hat end caps.

It was Norris Barsumian (Norris Cams) that gave me that hint a couple of decades ago. I'll have to do some research to find a good replacement if I can't find those spares. Time to go back and measure springs and spring rates and start looking through spring charts to find suitable replacements.

[LOUD MOUSE]

Ya lost me on this one.
I use the same bolt and washer to install the springs that HONDA issued and ya say ya had to compress the spring to start the bolt.
OK?
Still wonder on the (Apropos of nothing) statement. ..................lm

I wish I could remember. I'm sure I still have a spare set back in Australia. next time I'm back there I'll have a look. They were long enough that they had to pressed in to get the bolt started and they came with thin steel top hat end caps.

It was Norris Barsumian (Norris Cams) that gave me that hint a couple of decades ago. I'll have to do some research to find a good replacement if I can't find those spares. Time to go back and measure springs and spring rates and start looking through spring charts to find suitable replacements.

[teazer]

Let me try that again.

The springs we used were much longer than stock and were supposedly for a SOHC Cb750. I cannot remember how much longer and don't have a set I can measure.

You know that with a stock length spring and stock bolt and washer, the bolt will go in a few turns before it starts to compress the spring? Well with these, they were longer, so the stock bolt rested on the spring and didn't reach the post, so they had to be partially compressed to start the threads.

Did ya get it this time or do I need to strip my race bike and measure the springs when I'm back in OZ? I may need to do that just so I have a record of what the heck they are.

[LOUD MOUSE]

Apropos of nothing, now pray tell how ya didn't pack the pocket for the spring in the pressure plate with a spring that tall and not coil bind.
Super Thin wire?. ............lm

Let me try that again.

The springs we used were much longer than stock and were supposedly for a SOHC Cb750. I cannot remember how much longer and don't have a set I can measure.

You know that with a stock length spring and stock bolt and washer, the bolt will go in a few turns before it starts to compress the spring? Well with these, they were longer, so the stock bolt rested on the spring and didn't reach the post, so they had to be partially compressed to start the threads.

Did ya get it this time or do I need to strip my race bike and measure the springs when I'm back in OZ? I may need to do that just so I have a record of what the heck they are.

[teazer]

Almost. You are on the right track.

Not super thin, but thinner IIRC, and less coils per inch, if you follow me.

Stock coils are very close and the hi-po coils are wider spaced. No sign of coil bind.

Clever people that designed those springs. I just got lucky and found them.