Author Topic: MUCH better day today (and an oil leak Q)  (Read 857 times)

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Offline Scott S

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MUCH better day today (and an oil leak Q)
« on: July 02, 2010, 12:12:16 PM »
 Got the rear brakes sorted, parts ordered for the front brakes and the petcock. In the meantime, the correct 5.5mm fuel line came in and I was able to put on a spare tank and hear the bike run again.
 I got her up to 80mph and through all 5 gears. She runs pretty well. There's a slight bit of loading up at idle and I've yet to figure out if she likes choke or not when cold, but she pulls hard and shifts nicely.
 I know there's some slop in the points or points plate, so I won't chase a carb tuning issue until the timing is resolved. I have plans for a points replacement, so that's the next step, then the final fine tuning on the carbs (I'd say they're at 90% or better already).

 I did notice a very small oil leak from the left side cover. It only started dripping after I parked the bike, so it's not horrible. I see some oil around the shifter shaft. I have NOT pulled the side cover yet, but I suspect the shift shaft or sprocket seal or the like.
 I did some searching and found some stuff about 550's and 750's, but what all is involved if I have to replace some seals under the left side cover? I've done similar stuff on my Yamaha XS650's, but haven't even pulled the cover to verify where the leak is coming from on the Honda yet. Advice or a link to a "how-to" thread or article for those oil seals?
'71 CB500 K0
'17 Triumph Street Scrambler
'81 Yamaha XS650

Offline Gordon

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Re: MUCH better day today (and an oil leak Q)
« Reply #1 on: July 02, 2010, 12:25:09 PM »
Most likely culprit is the shifter shaft seal.  Once you have the cover off it's a quick pull and replace job.  Nothing else needs to be removed. 

Offline Scott S

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Re: MUCH better day today (and an oil leak Q)
« Reply #2 on: July 02, 2010, 12:28:41 PM »
 That's good news and I hope you're right!
 Long day in the garage today and I was ready to come inside to the A.C. I'll check it out soon and verify what's leaking...
'71 CB500 K0
'17 Triumph Street Scrambler
'81 Yamaha XS650

Offline Scott S

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Re: MUCH better day today (and an oil leak Q)
« Reply #3 on: July 02, 2010, 03:59:14 PM »
 Other than the drive sprocket, the shift shaft seal is about the only thing it could be, right? I don't see anything in the factory diagrams for the clutch pushrod...
 I'll probably pull the cover in the morning.
'71 CB500 K0
'17 Triumph Street Scrambler
'81 Yamaha XS650

Offline Gordon

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Re: MUCH better day today (and an oil leak Q)
« Reply #4 on: July 02, 2010, 04:05:55 PM »
It could also be the paper gasket that seals the transmission cover itself, but since you said you see some oil around the shifter, that's what I'm leaning toward.  The clutch is on the other side. 

Offline Scott S

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Re: MUCH better day today (and an oil leak Q)
« Reply #5 on: July 02, 2010, 04:09:15 PM »
 Well, I have one of the early 500's and the pushrod for the clutch is on the left side, too. I'll check it out early tomorrow.
 On the XS650's, I always ordered TWO clutch pushrod seals and output shaft seals, because they're a tight fit and you stand a good chance of boogering one up. Is that the case on the SOHC or is the shifter seal an easy fit? Should I order two while I'm at it?
'71 CB500 K0
'17 Triumph Street Scrambler
'81 Yamaha XS650

Offline Gordon

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Re: MUCH better day today (and an oil leak Q)
« Reply #6 on: July 02, 2010, 04:12:07 PM »
Sorry.  I was going under the assumption this was your 750.