Author Topic: CB650 clutch repair trip  (Read 365 times)

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Offline Don R

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CB650 clutch repair trip
« on: July 02, 2023, 10:23:29 AM »
 I'm considering making a 2.5 hour trip to fix a worn-out clutch on a friend's cb650. He bought it with clutch trouble and hasn't really ever ridden it. With me being a 750 guy, is there anything I need to know before embarking on a trip to replace his clutch? 
 I've tried to coach him on adjustment but he's sure the clutch is shot, I owe him a favor so rather than him bringing the bike I'm thinking about going there. Does the 750 clutch nut tool work on a 650? 
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Offline fizzlebottom

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Re: CB650 clutch repair trip
« Reply #1 on: July 02, 2023, 11:09:32 AM »
I'm not familiar enough with 750 clutches, but have torn my 650's clutch apart a few times. Here are my thoughts:

It is pretty straightforward. Aside from the lock nut (https://www.partzilla.com/product/honda/90204-426-000?ref=d4d23eeea7d73e26355efd02232d75a94c763baf), you don't need any special tools except for a torque wrench. I don't think the 750 clutch tool is the same as the 650, so you'll need to figure that one out beforehand.

There are a few things to pay attention to. All but 1 of the friction plates are the same. The 1 different one has wider tabs and will only fit in a specific space. Also, there is a judder spring that is concave on one side. Take note when disassembling which direction it is facing. Lastly, take care to progressively loosen the clutch plate lifter. They're small and have been known to snap when the springs put too much pressure on them either during removal or reassembly. With that, reassemble by tightening them progressively like cylinder head bolts, and use a small torque wrench if possible. "Hand tight" is meaningless.

Oh yeah, either bring a replacement gasket or prepare to make one.
1982 CB650SC Nighthawk

Online bryanj

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Re: CB650 clutch repair trip
« Reply #2 on: July 02, 2023, 11:13:04 AM »
No it isnt im afraid
Semi Geriatric ex-Honda mechanic and MOT tester (UK version of annual inspection). Garage full of "projects" mostly 500/4 from pre 73 (no road tax in UK).

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Offline Don R

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Re: CB650 clutch repair trip
« Reply #3 on: July 02, 2023, 11:16:58 AM »
 I see a nut spanner socket listed for 650, 1100 and 1200 Hondas so there's that. The nut seems to fit those bikes also.
No matter how many times you paint over a shadow, it's still there.
 CEO at the no kill motorcycle shop.
 You don't need a weatherman to know which way the wind blows.