Topic: 1975 CB750F with new clutch that slips during full throttle sometimes.

[kaptainkid1]

So I have 1975 Honda CB750F super sport with clutch issues.
It slips during hard shifting or fast take offs. I've also noticed in 5th gear doing 90 it slips. Hard throttle when passing.etc....
The bike does have extra weight but no more than a 200 lbs rider and 40lbs panniers when loaded.
I did change to new heavy duty springs, clutch and soak them over night in cycle oil.
I did not change the clutch plates but they seem clean and fine.
So the clutch has been adjusted correctly I suspect since I've adjusted a couple times with different pull points and tried different adjustments so the lever1/4 inch play before it engages and disengages.
I'm also using castrol 4t motorcycle oil 10-40w honda recommended oil.

I'm not sure if I have heavy springs with ebay replacement clutch plates. It was advertised as so but who really knows.

So does the CB750 generally slips on hard throttle and shifts? Is this typical since the cb750 is such a heavy bike?

Does anyone have a link to a set of good replacement plates, springs and clutch plates worth replacing at a budget.
I'm not a racer but I do like take bike out shift through the gear without slipping.







 

[Don R]

 Did you adjust the clutch lifter as well as the cable?  The reason I ask is, I didn't once.

[flybox1]

+1
Adjust the lifter and nut in the center of the clutch under cover.  Be sure the clutch cable is properly set.  I had to do both of these to prevent slipping out of 1st on launches.

[kaptainkid1]

Well I've seen videos on how to adjust the screw under the plate but it still slips. My concern is that I didn't adjust it correctly and I've played with set up many times. So adjust the clutch nut first then I adjusted the cable second according the video link below.
If I can recall correctly the nut should be adjusted out until it catches and then 1/4 turn out.


Here is the video I followed the adjustment.

[jonda500]

you do mean screw IN until it touches then 1/4 turn back out right?
John

[Ericcb750]

Hi John, Yes , if you loosen the lock nut and screw in the adjuster until in gently seats, then back out 1/4 you should be all set. Make sure there is slack on the cable when doing this and then make the cable adjustments afterwards. adjust the cable at the clutch cover first for what I believe is about 1/4" of free play and then adjust last at the lever... I'm almost positive this is the correct procedure. Mine did the same thing when I first re-built it as I had it adjusted incorrectly.

Best of luck.

[kaptainkid1]

I'll readjust the clutch nut and drive around and see if the adjustment corrects the clutch slip.

Thanks!

[brewsky]

That is a good looking bike!
Is there some reason the bags droop down in the rear?
It would look so much better if the bumper rails were parallel to the tank/seat imho.

[kaptainkid1]

It was designed that way. It's shoei  oem bags from the 70's. They came with bike. 1 owner bike and he died so it purchased as estate sale.