Topic: 750k clutch spring plate

[surein]

I have this much play room - is it normal? The triple ball ramp has to be tight between the plate and the cover for it to compress the springs - correct? I find that now when I tighten the adjusting screw, I can screw it all the way in not leaving any room for the lock nut.

[MCRider]

i was wondering about that. Something's wrong (duh). Wish I were there.

The lifter plates all carry the same part number.

Do you have #12 installed?

http://www.motogrid.com/pages/OemParts?aribrand=HOM#/Honda/CB750K2_A__MOTORCYCLE%2c_JPN%2c_VIN%23_CB750-2000001/CLUTCH/CB750K2-JPN-A/2Y143410E14341009B

[surein]

#12 was already installed in the bearing. The F plate I got had a different #12 than my original so I had to switch the bearing. I didn't even know they could be separated.

This picture shows the #12 on the #19 bearing or am I missing something?

[MCRider]

Yah I had to ask. It looked like it was there in your previous picture, and i wasn't really in tune to it beingremovable either.

Looking at that picture, I can't help but think the lifter plate is further down in the hub than I remember it should be. That would indicate the splines/notches aren't engaged. Can you grab the lifter plate and turn it?

I'm really reaching here.

[surein]

The lifter plate is actually sitting on the cross sections of the hub - is that too low? I cant really see the posts so that's my gauge.  Yes the plate and the hub does rotate.

I won't be able to work on this tomorrow but I will take the entire clutch apart and see if I missed anything; not that I have an extra parts lying around.

I appreciate all your help Rider - thanks again

[MCRider]

i'M A LITTLE GROGGY. That wasn't the best test, it will rotate good or bad. I'll pop mine off tomorrow and see what's the good test.  Take some pictures etc. I think something is wrong with the assy though.

[surein]

haha! no worries and thanks again. Have a good night

[MCRider]

So here's what i found:
First do you have all 3 parts of the lifter?

Here you can see how deep in the lifter plate is when properly seated:

It measures about 4.5mm deep, maybe 5mm.

That picture also shows that a screwdriver will drop behind the lifter plate. You mentioned your lifter plate is down on the castings of the hub. This is incorrect, mine was proud of the castings.

Grabbing the lifter plate thus, you should not be able to turn it either way. My bike is on the centerstand and in neutral.

[surein]

First off that's the cleanest bike i've ever seen!
Second - nice colour on the frame
Third - did I mention how clean your bike looks?

Ok so back to my headache - I finally got a chance to get into it. What I find is that the press plate with the 4 posts falls back into the engine once I assemble the unit, and the teeth slightly catches the plates not allowing it to return. This cause my pressure plate to line up incorrectly.  Is that normal? I do have the #15 washer so not sure what I'm missing..

Plus my clutch does rotate freely making it difficult to tighten the lock nut

Thanks so much for opening up your clutch Rider

[CrankyOldGuy]

Just noticed this thread.  Back in ancient times when my cases on the 750K1 had to be replaced, the Honda mechanic must broken one of the clutch plate ears when reassembling the engine.  I discovered this because he forget to put a handful of o-rings in the rebuild ... leaked oil like a sieve.  I had a local machine shop, which specialized in aluminum welding (i.e. highway overhead signs), build and machine a new ear on.  It looked great and still works fine. 

Never thought to buy a new one ... but at that time I was ticked off at the dealership 

Harry O.

[surein]

haha! Harry O.
This all started so I can get a bit more friction zone.

I finally finished and rode around the block. Stalled it once cause I have to get used to the new clutch. Will tweak the cable to get it just right but it feels so much smoother.

Can't believe I fixed it! I had to make sure the pressure plate with the posts didn't fall back when I was screwing the lifter plate. Once the lifter plate was on tight everything else fell into place.

Now I have to fix my brakes *gulp*

Thanks again!!

[MCRider]

haha! Harry O.
This all started so I can get a bit more friction zone.

I finally finished and rode around the block. Stalled it once cause I have to get used to the new clutch. Will tweak the cable to get it just right but it feels so much smoother.

Can't believe I fixed it! I had to make sure the pressure plate with the posts didn't fall back when I was screwing the lifter plate. Once the lifter plate was on tight everything else fell into place.

Now I have to fix my brakes *gulp*

Thanks again!!

That sounds Great! Hope i helped. The condition you cited, the pressure plate with the posts falling back into the basket is typical. Maybe not in this thread but in other threads about this same topic, the trick to that has been mentioned by others. You should thread a longer 6mm bolt into one of the posts. Using it as a handle, you can pull the pressure plate into its spline/notch alignment. Then thread in the other 3 bolts till they are snug enough to hold it where it needs to be. Then thread out the handle bolt and thread in the 4th bolt. Then finish up tightening the 4 bolts in rotation.

As to my bike, a 72 CB750K, thank you for the compliments. After having been used and abused for 23 years, becoming hugely filthy on many occasions, it is being rebuilt from scratch. Hence the cleanliness. I invite you to peruse my build thread, the link is in my signature.

I needed to pull the cover off the clutch to see if I had replaced the lifter with a low mileage one I had bot. I had. But i was ignoring helicoiling a stripped hole, so I'll do that.

[surein]

Thanks for everything Ron. I have the Clymers and My CB750 as reference to these little mods but nothing beats a bit of live help.

Great build thread.  You have to be the most patient man in the world.
Very inspiring

Good luck and take care till next time