Clunk in drive line


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Totalchaos
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Joined: Fri Apr 17, 2020 3:16 pm
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Motorcycle: 87 Gl1200a aspencade

Clunk in drive line

Post by Totalchaos »



I have read everything I can find about this. My bike makes a Clunk if I'm in first and starting to speed up from a dead start or slow down(using the bikes compression). I broke down and tore into it. I worked as a auto tech for around 30years.i know my way around a spanner.but this one has me pulling my hair out. I removed the rear tire and the pumpkin inspected all the related splines other than needing a good coat of grease no excessive wear. I pulled the drive shaft and again checked for wear and nothing except need of grease. I removed the rubber boot to look at the u joint. Could not tell much with it in the bike. Got the u joint out. Looked it over and no real wear here either.once I got it clean I took photos. The only thing that stuck out to me was. The heat scares(blueing of the yoke. Take a look and you guys tell me what I'm missing.
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dingdong
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Re: Clunk in drive line

Post by dingdong »

Not sure about the clunk but the coloring is normal. It is from the hardening / tempering process of the splines.
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Totalchaos
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Motorcycle: 87 Gl1200a aspencade

Re: Clunk in drive line

Post by Totalchaos »

That's what I was thinking to
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WingAdmin
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Re: Clunk in drive line

Post by WingAdmin »

When the U-joint in my 1500 was worn enough to cause a clunk, I could feel the slop in my hands when I took it out. It was pretty obvious.

If yours is pretty tight and with no obvious free play, then I would start looking elsewhere for the cause.
old.wing
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Re: Clunk in drive line

Post by old.wing »

Take a closer look at the spider, the connector between the drive case and the wheel. It should not have any sign of wear and should be well greased. If it is dry or worn out, it can produce a loud clong, like a hammer on your rim. Good luck.


👍 Bert

GL 1200 Std and GL 1200 SEI
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