Topic: Clutch lifter plate issues

[Cvillechopper]

I finally got to get on my project and ride her around the yard for the first time to see if everything actually wen together right.  Well, the carb synch made a great deal of difference and the engine was very strong but the clutch slipped if I gave her too much gas.  At first I thought the wheel was slipping, but nope, it's the clutch.  I took the plates out and everything is within spec as far as I can tell.  Since I have her open I decided to put the new chrome clutch cover on, but now there's no contact between the release rod and the clutch lifter plate.  The covers are the same and the lifter rod has the same movement as the original.  I was wondering if it is possible that the lifter plate was tightened too far?  I couldn't find any direction of installation in the manual or in the forum as to how tight the 4 bolts need to be other than the standard 10mm bolt around 18ftlbs.  What am I missing?  (other than the whole picture)

[CB750F2]

I suggest that you double check your assembly. There is an article on rebuilding a clutches in the Technical Library of this site. Towards the bottom of the article there is a section on clutch adjustment. Good luck. Pat from Aus

[Cvillechopper]

I took her back apart and found that one corner of the lifter plate has broken off.  Has anyone had this happen to them?  I'll be in the market for a replacement if anyone happens to have one for sale.  I put everything back together and it seems to disengage, but I can't be sure until I get her outside and running once the front wheel goes back on with new tire and trued up. 

[Terry in Australia]

G'Day Mate, the lifterplate is as fragile as f*ck, and there must be amillion busted ones out there, I've got three or four myself. You need to tighten the 4 6mm screws evenly, or you'll keep busting them. I've seen some bodges with washers etc, but don't recommend it, I'd hate for a part like that to disappear into your transmission!

The clutch itself needs to be assembled carefully, making sure all the "splines" are lined up perfectly, or that clutch will never work well. Also, on later models, like yours, the fibre plates all have to go in with the grooves pointing in the same direction, as per the diagram in the manual, as they're designed to move oil around the clutch assembly. Cheers, Terry.

[74cb750]

Hey cilleveiliecillechopper,
ok so I couldn't remember your id name...   I just took one off my totaled 1978 cb750  last week. Email me if this would fit as you didn't say what year.
michel

[MRieck]

I took her back apart and found that one corner of the lifter plate has broken off.  Has anyone had this happen to them?  I'll be in the market for a replacement if anyone happens to have one for sale.  I put everything back together and it seems to disengage, but I can't be sure until I get her outside and running once the front wheel goes back on with new tire and trued up. 

It has happened to me.

[Cvillechopper]

74 cb750, Mine's a 78 750K.  I think I noticed a difference in the clutch spring length requirements between the K and F models in 78 but don't know if that makes a difference for other parts.  Is yours a K by chance?  If you don't need yours anymore, I'd gladly take it off your hands, with compensation, of course.  Send me an email with your address and how much you want for it and I'll send a check right away. 

Terry, When I took the pack out I noticed the joker before me had just thrown the plates in seemingly randomly.  I've got them faced the right way now.  When you mention the "splines" are you talking about the 1/2 in pieces on the outter edge of the friction plates or the smaller ones on the inside of all of the plates?  Or is it something completely different that I am just missing?  There was some wiggling involved in getting the pack and housing completely seated.  I had to rotate the housing about 90 degrees from starting position to get it in all the way. 

Thanks for the help.  I am NOT a transmission guy.......... yet.

cvillechopper@earthlink.net

[Terry in Australia]

Terry, When I took the pack out I noticed the joker before me had just thrown the plates in seemingly randomly.  I've got them faced the right way now.  When you mention the "splines" are you talking about the 1/2 in pieces on the outter edge of the friction plates or the smaller ones on the inside of all of the plates?  Or is it something completely different that I am just missing?  There was some wiggling involved in getting the pack and housing completely seated.  I had to rotate the housing about 90 degrees from starting position to get it in all the way. 
Thanks for the help.  I am NOT a transmission guy.......... yet.
cvillechopper@earthlink.net

G'Day Mate, well I was talking about the inner smaller splines, (there's probably a better word for it, but nothing comes to mind) the plate with the four posts that the lifter plate attaches to needs to be pulled towards you to ensure that it's lined up too, which is what I think you're alluding to with your "wiggling" reference. You're quite right, sometimes you have to pull it out and turn it through 90 degrees to ensure that it will line up, and that's where a lot of guys come unstuck. Anyways, looks like you're on top of it now, so have fun mate, and let me know how it goes! Cheers, Terry.