Author Topic: Clutch slip (Read 6305 times)

ElCheapo · « **on:** September 07, 2005, 06:03:35 PM »

I took my 75 CB750 four out for a short ride today, found cracked left mirror when I got on the #@#!$%#@!$! thing.

But anyway I was doing a hard accel about 5-6 grand and noticed a little slip in third let off it and then got back on it and it hasn't slipped again. However the clutch doesn't grab until it is at the last 1" of the lever action. What should be considered normal? I am looking at doing the clutch on it but I have other things to do at the same time including the ^%#$Q^%&@#! Mirrors.

What gives???

Kevin D · « **Reply #1 on:** September 08, 2005, 04:13:26 AM »

Mine slips a little bit, but only when I'm thrashing the bike. Repair will be an off season project including new friction plates, springs.

There are a couple of identified issues that I have found here at SOHC4 - one is with oil that is too slippery, the other is with weak clutch springs. Your adjustment sounds ok but check if there is a little free travel in the lever before disengaging the clutch, so your adjustment isn't holding it part way disengaged.

As you are squeezing or releasing the lever the range from engaged to disengaged is kinda small but I don't stall it too often.

FWIW I've been using Castrol GTX 20w-50 and I'm switching to Valvoline 20w-50 motorcycle oil (designed for wet clutch use).

EDIT - I've changed the OE clutch springs to Barnett - no more slip.

ElCheapo · « **Reply #2 on:** September 08, 2005, 07:08:35 AM »

Well that sounds better to me. I will double check the adjustment to make sure it is not staying partly applied.

GeoffT · « **Reply #3 on:** November 20, 2005, 01:51:30 PM »

My bike has not been ridden for two to three weeks and I got on it today for a spin seeing as the weather was dry and not too cold. After half a mile the engine started to rev up while still in gear. At first I thought it was the clutch cable sticking as it had been a bit sticky before i set off. Checked the cable and it was pulling freely on the clutch lever at the engine end. Seemed whatever gear I was in if i turned the throttle to much the engine would rev up then slow down into gear. I am a complete novice when it comes to engines but I am sure this is the clutch. Looked in faqs but not sure if I can solve the problem from there.
I do have a workshop manual (thanks bryanj) but any helpful hints as to the right direction would be great.

Cheers
Geoff.

GeoffT · « **Reply #4 on:** November 20, 2005, 02:03:44 PM »

Cant remember but I got it from my local bike shop - it is the right oil but it has been in for nearly a year. Was intending to to a change soon.

SteveD CB500F · « **Reply #5 on:** November 20, 2005, 02:24:21 PM »

Definitely sounds like clutch slip - the engine speed increases faster than the road speed.
I'm afraid it will probably get worse.
Adjust the clutch per the manual with lever play etc and post back.

GeoffT · « **Reply #6 on:** November 20, 2005, 03:13:22 PM »

Just took a quick trip to the garage and back. The oil is Putoline 10/40 DX4 for 4 stroke engines.
Will try the adjustment in the cable and let you know how it goes in next day or 2.

Sam Green Racing · « **Reply #7 on:** November 20, 2005, 03:24:03 PM »

Just because you can pull the clutch leaver in, and it looks like it has gone back off when you let it out, dont think for one second that it is not sticking.

We had the same problem with the CR and took it the clutch had had enough,........... wrong.

Take the cable off and check if you can move the inner cable by hand,.......if you can't, oil it or replace it. If you can Clutch needs adjusting or replacing.

Sam.

Killer Canary · « **Reply #8 on:** November 20, 2005, 04:45:27 PM »

There's also a screw and locknut adjuster at the bottom of the clutch cover.I adjusted this before going to the trouble of replacing the clutch and it took care of the slip.

GeoffT · « **Reply #9 on:** November 21, 2005, 12:20:16 AM »

Going to try adjusting the cable/clutch during lunch today or later tonight. Will post later once done with results.
Thanks once again guys.
Geoff

JonnyHonda · « **Reply #10 on:** November 21, 2005, 11:49:10 AM »

Quote from: samcr750 on November 20, 2005, 03:24:03 PM

Just because you can pull the clutch leaver in, and it looks like it has gone back off when you let it out, dont think for one second that it is not sticking.

We had the same problem with the CR and took it the clutch had had enough,........... wrong.

Take the cable off and check if you can move the inner cable by hand,.......if you can't, oil it or replace it. If you can Clutch needs adjusting or replacing.

Sam.

I agree with Sam, if you pull the clutch in and release the lever, if there is more play in the lever for a few seconds the cable is "Dragging" as the clutch returns.

GeoffT · « **Reply #11 on:** November 22, 2005, 12:31:10 AM »

Did not get time to look at it yesterday so got up early this am to adjust the cable. Probably not enough slack on it - i.e there was very little play at the lever. Strated to adjust then after a few turns at the lower end checked the lever for play. Now the cable wont return and the lever was completely loose, not pulling the cable at all. Definately stuck cable. Had to leave it and go to work.

Next chance I get I'll remove the cable and give it an oiling. Is that a job for the old WD40 or is there a better lubricant for it?

GeoffT · « **Reply #12 on:** November 22, 2005, 02:51:03 PM »

Sorry to bore you all with this one but took the cable off tonight and it will not budge inside the sleeve. Wondering if it could be corroded on the inside - the cable looks good on the outside but putting wd 40 down the inside has achieed nothing. Any suggestions for freeing up this cable before I mail off for a new one?

Bob Wessner · « **Reply #13 on:** November 22, 2005, 03:05:31 PM »

I would say it is not worth fooling with. No matter what you do, the corrosion will still be there. Replacement cables are pretty cheap.

dusterdude · « **Reply #14 on:** November 22, 2005, 03:14:22 PM »

i think the clutch cable,which is a motion pro,for my bike was less than 20 bucks at the honda stealer

Bob Wessner · « **Reply #15 on:** November 22, 2005, 03:34:22 PM »

I meant to add a little experience I had. My clutch worked fine, but the effort to pull seemed a bit high and slightly rough. Dan Jones stopped by one day. I tried his and it was much easier and silky smooth. Thought, hmm. We lubed it again (I had done it some time ago), no change. We looked at it carefully and found that it had been misrouted and had touched a header melting the outer cover. Some moisture must have been getting in and it was corroded. Ordered a new one. Now silky smooth and a fraction of the effort to work it.

GeoffT · « **Reply #16 on:** November 23, 2005, 12:41:38 AM »

I know you are all right and I should replace but it is hard to resist my thrifty Scots urge to try and save a few pounds with much physical effort and a little heart ache. Looked on Dave Silver site. 12 pounds. JINGS CRIVENS - HELP MA BOAB!!

I'll have to maybe sell somthing.

lassenc · « **Reply #17 on:** November 23, 2005, 05:27:29 AM »

It's always a good idea to soak new cables in oil for about 24 hours before you install them!

GeoffT · « **Reply #18 on:** November 23, 2005, 08:59:22 AM »

Quote from: lassenc on November 23, 2005, 05:27:29 AM

It's always a good idea to soak new cables in oil for about 24 hours before you install them!

Certainly going to bare that in mind. How would you soak it, just in a bath of oil? and what kind of oil?

lassenc · « **Reply #19 on:** November 23, 2005, 12:00:31 PM »

Quote from: GeoffT on November 23, 2005, 08:59:22 AM

Quote from: lassenc on November 23, 2005, 05:27:29 AM
It's always a good idea to soak new cables in oil for about 24 hours before you install them!

Certainly going to bare that in mind. How would you soak it, just in a bath of oil? and what kind of oil?

Just lay the cables in a bath of motoroil

clarkjh · « **Reply #20 on:** November 23, 2005, 02:48:33 PM »

Geoff

Mine was stuck when I got the bike. Took the cable off an hung it from the rafters, after making a cone with duct tape at the top. Then just filled the cone with 10/40 oil and let it be for a couple of days untill it started dripping out the bottom. After about another 1/2 hour of pulling back and forth, works like a charm. I am going to buy a spare someday

James

Sam Green Racing · « **Reply #21 on:** November 25, 2005, 09:29:52 PM »

Geoff, you tight arsed Scot.....I told you it would be that in the first place......Don't muck about trying to lube it, there will be a broken strand in there.
Phone DSS and you will have one in a few days and be back on the road, thats if yer not snowed up by now.

Regards Sam...Yer sasanach mate south of the border.

GeoffT · « **Reply #22 on:** November 26, 2005, 08:29:11 AM »

Hey Sam

you were probably the frst to suggest oiling it. Fare enough you did say oil or replace.

Not to snowy here yet but have to make sure coat is fastened when we go out the door or we'd end up in Caithness or even further south. Intending to get cable from DSS but going to check the other cables before that.

Jonesy · « **Reply #23 on:** November 26, 2005, 08:44:16 PM »

I suppose if you really wanna try saving the cable, take a length of pipe about two inches longer than the cable, cap the end and fill it with penetrating oil. This way you can submerge the entire cable in it for a few days. A buddy of mine used to do this for brake cables on old cars he'd collect. However, new ones were unobtainable, and with cheap aftermarket cables, you'd probably spend just as much building the "pipe soaker" as you would for a new cable...

mrbreeze · « **Reply #24 on:** November 28, 2005, 12:15:18 AM »

Awww Hell...Don't eat for a few days and just go get the damn new cable!!!

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Author Topic: Clutch slip (Read 6305 times)

ElCheapo

ElCheapo