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The Vintage Japanese Motorcycle Owners Group: Discussion Forums

Vintage Japanese Motorcycle Owners Group :: View topic - Left Side Crankcase Oil Leak 1974 Honda CL125


Left Side Crankcase Oil Leak 1974 Honda CL125

 
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Sammysofa
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Joined: Jun 16, 2017
Posts: 3

PostPosted: Fri Jun 16, 2017 1:30 pm    Post subject: Left Side Crankcase Oil Leak 1974 Honda CL125 Reply with quote

Hello my left side crankcase cover was leaking oil. I changed the 2 o-rings but it still leaks.

Should this have engine oil behind the alternator cover?

If this should not have oil can I still run the bike and not damage anyhting as long as i fill up the oil when needed?

Any other gaskets or seals behind the rotor?

Help rookie working on a bike.



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spurlock
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Joined: Jul 08, 2014
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Location: Vacaville, CA

PostPosted: Sun Jun 18, 2017 6:32 am    Post subject: Reply with quote

Hello Sammysofa,

Yes, there is supposed to be oil inside the alternator cover since that is directly open to the crankcase. I would remove the sprocket cover and degrease and wash the entire area around the alternator cover. Let it dry, then spray all surfaces with a dry athlete's foot powder like Tinactin, which will leave a white coating on the surfaces.



Then run the bike a short time, stop and inspect. Any oil leak will show up easily as a stain in the white powder, so you can see exactly where it is coming from. Common spots are the shift spindle seal and the alternator wiring grommet. If coming from the grommet, pull the side case, lift the grommet out of its notch in the case and spray with solvent like Brakeclean. Then slide the grommet one way and the other on the wires while spraying more solvent. When dry, apply a case sealer like hylomar, Hondabond, Gasgacinch etc. to the wires and slide back and forth to get the sealer into the grommet holes. Apply more sealer around the outside of the grommet and reassemble. Let dry, then retest.

Good luck, and let us know what you find.

-Bill

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1975 Honda CB125S
1975 Honda XL250K2
1989 Honda NX250
1989 Honda GB500tt
1990 Honda GB500tt
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fasterspider
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Joined: Feb 04, 2007
Posts: 3203
Location: Granada Hills, SFV, Ca.

PostPosted: Sun Jun 18, 2017 2:03 pm    Post subject: Reply with quote

The grommet for the alternator wiring is one issue, another can be the shifter seal, very typical problems.
The grommet needs to be gobbed up with Hondabond4 or similar grey gasket maker material and the seals under the countershaft sprocket cover can all be bad, I've recently replaced all four of them in a CL350.

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Ray #1
1964 Yamaha MG1-T Trailmaster
1974 Suzuki TS185 Sierra Suitcase Cycle
1981 Yamaha XT250H
Sold CBX and both Trail 90s were stolen
fasterspider [at] gmail [dot] com
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spurlock
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Location: Vacaville, CA

PostPosted: Sun Jun 18, 2017 2:11 pm    Post subject: Reply with quote

Sammysofa, forgot to mention you should also look at the O-ring on the neutral switch, part #15 in your diagram.

-Bill

_________________
1975 Honda CB125S
1975 Honda XL250K2
1989 Honda NX250
1989 Honda GB500tt
1990 Honda GB500tt
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Sammysofa
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Joined: Jun 16, 2017
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PostPosted: Mon Jun 19, 2017 2:44 am    Post subject: Reply with quote

spurlock wrote:
Sammysofa, forgot to mention you should also look at the O-ring on the neutral switch, part #15 in your diagram.

-Bill


Thanks I didn't see that thanks for pointing the neutral switch O-ring. Question is that part behind cover #1 or #2?
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spurlock
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Joined: Jul 08, 2014
Posts: 769
Location: Vacaville, CA

PostPosted: Mon Jun 19, 2017 6:52 am    Post subject: Reply with quote

Sammysofa wrote:
spurlock wrote:
Sammysofa, forgot to mention you should also look at the O-ring on the neutral switch, part #15 in your diagram.

-Bill


Thanks I didn't see that thanks for pointing the neutral switch O-ring. Question is that part behind cover #1 or #2?


Neutral switch is behind #2, the sprocket cover but very close to the alternator case.

-Bill

_________________
1975 Honda CB125S
1975 Honda XL250K2
1989 Honda NX250
1989 Honda GB500tt
1990 Honda GB500tt
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KirkN
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Joined: Feb 23, 2007
Posts: 1284
Location: Orlando, FL

PostPosted: Mon Jun 19, 2017 8:09 am    Post subject: Reply with quote

What they said!

I've just recently had to follow Bill's exact procedure to track down a leaky neutral switch on my own bike.

I had thought for sure it was the shift shaft seal, but after a thorough cleaning/degreasing and a short ride, I could tell it was a weeping neutral switch.

Good luck with yours!

Kirk
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