1983 cb650 with 109k miles needs some TLC

If it's broken or just needs tweaked

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83cb650_100k
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1983 cb650 with 109k miles needs some TLC

Postby 83cb650_100k » Sun Feb 12, 2017 4:09 pm

So I am brand new to this forum and in need of some advice and guidance. I just bought a 1983 cb650 with 109 thousand miles!! I basically got the bike for free and it does run and drive. I need to do some regular maintainence things like oil change, plugs, air filter and front brake pads. The problem I'm having is when I run the bike for more than 30 min the clutch no longer disengages when the lever is pulled in. As it sits when cold I have to pull the lever all the way until it touches the handlebar to get the clutch to disengage and the clutch starts to grab when the lever is less then 1/2" from the bars. Until it's fully warmed up and then no longer disengages. From doing some digging around I have come up with Slave cylinder needing cleaned and rebuilt. I ordered a K-L rebuild kit already and am waiting shipment. My question is what do you guys think? Am I on the right track? Maybe master cylinder and clutch need rebuilt also? Bike runs great with plenty of power and no hesitation or weird noises. Also the clutch seems to grab very positively with no slip.

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Folsoml
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Re: 1983 cb650 with 109k miles needs some TLC

Postby Folsoml » Sun Feb 12, 2017 5:19 pm

That is incredible mileage for any bike!
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83cb650_100k
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Re: 1983 cb650 with 109k miles needs some TLC

Postby 83cb650_100k » Sun Feb 12, 2017 6:17 pm

I know, it's waaaaaaay up there. But the bike still runs good. I just need to figure out this clutch issue...

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Re: 1983 cb650 with 109k miles needs some TLC

Postby cb650 » Sun Feb 12, 2017 6:31 pm

I would rebuild both. no point in rebuilding the slave just to dump dirt from the master in it. That is amazing miles for a 650. You can always look for another to put you new rebuilt parts onto if this one goes south.
Did you clean the tank out?!?!?!?!

83cb650_100k
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Re: 1983 cb650 with 109k miles needs some TLC

Postby 83cb650_100k » Sun Feb 12, 2017 7:13 pm

No I didn't clean the tank, the guy I bought it from was putting about 6k miles a year on it and just stoped riding it October. Am I on the right path for this issue? Or is there something I didn't think of that could cause the clutch to act like that?

83cb650_100k
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Re: 1983 cb650 with 109k miles needs some TLC

Postby 83cb650_100k » Sun Feb 12, 2017 8:14 pm

I figure if it runs around for another year or two I would donate it to Honda to be out on display somewhere!!! They really built a top notch motorcycle with this one. Must be a Tuesday or Thursday bike!

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Folsoml
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Re: 1983 cb650 with 109k miles needs some TLC

Postby Folsoml » Mon Feb 13, 2017 6:06 am

I'm not really familiar with the hydraulic clutch setup of the Nighthawk CB650SC, so I can't really give too much advice on that. It would be hard to go wrong by rebuilding both the master and slave cylinders.
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83cb650_100k
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Re: 1983 cb650 with 109k miles needs some TLC

Postby 83cb650_100k » Mon Feb 13, 2017 6:50 am

So a very noob question but the drain plug for the oil, is it the flat Allen head bolt on the front left side of the bike if you were sitting on it? Also I have found that Rotella works well in these old Honda motorcycles. What oil do you guys run and what filter ?

cb650
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Re: 1983 cb650 with 109k miles needs some TLC

Postby cb650 » Mon Feb 13, 2017 3:32 pm

I use rotella also. The plug should be on the bottom but not sure. Never had a DOHC on the road. I do have a 84 parts bike .
Did you clean the tank out?!?!?!?!

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Folsoml
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Re: 1983 cb650 with 109k miles needs some TLC

Postby Folsoml » Tue Feb 14, 2017 4:07 pm

It looks like the oil drain plug is the same place as the SOHC bikes--bottom of the oil pan.

http://www.partzilla.com/parts/search/H ... parts.html

I use rotella as well.
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tario
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Re: 1983 cb650 with 109k miles needs some TLC

Postby tario » Wed Feb 15, 2017 6:19 pm

Rotella here too. Anything JASO-MA (I think that's right) will work on the clutch. I have used Castrol as well, no problems, just a bit pricy and small containers.
1979 cb650
1980 cb650

saber
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Re: 1983 cb650 with 109k miles needs some TLC

Postby saber » Wed Mar 15, 2017 1:48 pm

I am not much of a mechanic, but could your clutch problem be that the clutch cable needs adjustment?

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Re: 1983 cb650 with 109k miles needs some TLC

Postby cb650 » Thu Mar 16, 2017 4:59 am

dohc 650's had a hydraulic clutch
Did you clean the tank out?!?!?!?!

saber
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Re: 1983 cb650 with 109k miles needs some TLC

Postby saber » Thu Mar 16, 2017 5:05 pm

ok, I understand. thanks


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