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The Vintage Japanese Motorcycle Owners Group: Discussion Forums

Vintage Japanese Motorcycle Owners Group :: View topic - 1972 CB 175 Clutch Adjustment Issues


1972 CB 175 Clutch Adjustment Issues

 
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jakeZ
Weekend Warrior
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Joined: Aug 15, 2010
Posts: 67
Location: New Hampshire

PostPosted: Fri Sep 22, 2017 10:41 am    Post subject: 1972 CB 175 Clutch Adjustment Issues Reply with quote

I'm having a little trouble adjusting the clutch on my 1972 CB 175. It was grabbing too soon, so I attempted an adjustment. I followed the instructions in the Clymer manual. Screw in the lever and clutch cable adjusters completely. Loosen the adjuster lock bolt. Turn the large adjustment screw counter clockwise until you feel resistance, then turn it clockwise 1/4 turn. When I was done it was grabbing too late, so I went back to adjust again. Now I cant turn the large adjustment screw at all. Any idea what I did wrong. Should I take the cover off, and take the adjustment assembly apart?

Thanks for any help.
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fasterspider
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Joined: Feb 04, 2007
Posts: 3227
Location: Granada Hills, SFV, Ca.

PostPosted: Fri Sep 22, 2017 11:10 am    Post subject: Reply with quote

Have you replaced the clutch discs and springs yet since owning this ancient Honda?
Chances are the discs are worn beyond tolerances and the springs are sagged needing to be replaced.
I have given up on clutch adjustments and decided replacement is always the best option for a 40 year old plus bike.

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Ray #1
1964 Yamaha MG1-T Trailmaster
1974 Suzuki TS185 Sierra Suitcase Cycle
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Sold CBX and both Trail 90s were stolen
fasterspider [at] gmail [dot] com
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05c50
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Joined: Oct 26, 2007
Posts: 2951
Location: Greensburg Pa

PostPosted: Fri Sep 22, 2017 1:05 pm    Post subject: Reply with quote

If the adjusting screw won't turn, you'll most likely have to remove the cover to repair it. There's not too many parts and it's not that complicated. And then, Ray may be right.

..........Paul

_________________
�77 CB550f
�77 CB750a
�78 GL1000
�80 CB650c
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spurlock
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Joined: Jul 08, 2014
Posts: 835
Location: Vacaville, CA

PostPosted: Fri Sep 22, 2017 2:36 pm    Post subject: Reply with quote

Jake, as Paul says you will most likely need to pull the mechanism apart. Bit first you might try loosening the lock bolt about one turn and giving it a tap to make sure the locking fork is free (part #9 here). Then try turning the adjuster again while pulling the clutch lever in and out. The clutch lifter is basically a steep male thread working inside a matching female thread (not as exciting as it sounds). If I recall correctly the female threads are soft metal and wear over time. I suspect what might have happened is that by tightening up the adjustment you now have the threads working partly in a worn section and partly unworn. Don't be afraid to force the adjuster moderately in the clockwise direction to try to free it.

Note of caution: If you do pull the cover off, there is a ball bearing inside the adjuster cup that pushes on the clutch rod. Be sure to check as it might fall out. Put a glob of grease in the adjuster to hold the ball in place during reassembly. Good luck,

-Bill[

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jakeZ
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Joined: Aug 15, 2010
Posts: 67
Location: New Hampshire

PostPosted: Fri Sep 22, 2017 2:48 pm    Post subject: Reply with quote

Thanks guys. I did end up pulling the cover. First I tried taking the locking mechanism out completely. That didn't help unfortunately. I'm not sure why it bound up. Maybe I adjusted it too far? The parts all look fine. I need to get a new o-ring, and both stator, and clutch cover gaskets before I can attempt to put it back together. I think the clutch and spring are ok. While adjusting I was on both ends of the spectrum. Grabbing too early, then too late. Just need to adjust it to land somewhere in the middle. Thanks again for the advice. I'll let you know how I make out next week.
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