79 GL1000 goldwing strange knock noise


Information and questions on GL1000 Goldwings (1975-1979)
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mjb72
Posts: 3
Joined: Fri Aug 19, 2011 4:55 pm
Location: grafton, wi
Motorcycle: 1979 Honda goldwing GL1000

79 GL1000 goldwing strange knock noise

Postby mjb72 » Fri Aug 19, 2011 5:10 pm



Hi there,

I hope this has not been asked but a search did not produce a simmilar post. I have a 79 Honda gl1000. Im not sure of the actual mileage but I wouldnt doubt its over 100k.

I have a knocking noise that to me would sugjest a rod knock. Here is the curious part of it though. It will always produce this knock when cold and under about 2000 rpm. After it is warmed up and run down the highway for several miles at speed it seems to go away and will idle without the knocking at times. Other times it will knock when I come to a stop but what I find bizzare is that a lot of the time if I give the clutch a little jerk the knocking will stop. This only works once its warm, and especially after a long run.

My first thought is a rod knock but it seems odd that it would go away for any reason. Im pretty good with car engines but Im not so good with bikes so Im hoping someone here might have an opinion. Overall it runs out ok although I doubt it has all the power it once did. Gets about 35 mpg and starts first time every time, dont even have to choke it usually.

Imjust wondering at this point if its going to blow uip or if I should not worry about it. Any advice would be appreciated

Thanks in advance.

Myron



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Fred Camper
Posts: 1152
Joined: Sun Aug 16, 2009 9:15 pm
Location: Metro Detroit, MI
Motorcycle: 1977 GL1000, 1976 LTD GL1000

Re: 79 GL1000 goldwing strange knock noise

Postby Fred Camper » Fri Aug 19, 2011 8:30 pm

Are the valve clearances adjusted? Seems strange to me too.

mjb72
Posts: 3
Joined: Fri Aug 19, 2011 4:55 pm
Location: grafton, wi
Motorcycle: 1979 Honda goldwing GL1000

Re: 79 GL1000 goldwing strange knock noise

Postby mjb72 » Fri Aug 19, 2011 8:45 pm

Yes, in fact I just adjusted them a couple weeks ago.

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Fred Camper
Posts: 1152
Joined: Sun Aug 16, 2009 9:15 pm
Location: Metro Detroit, MI
Motorcycle: 1977 GL1000, 1976 LTD GL1000

Re: 79 GL1000 goldwing strange knock noise

Postby Fred Camper » Fri Aug 19, 2011 10:20 pm

Sounds like maybe a sethoscope is a worthwhile check.

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landisr
Posts: 393
Joined: Tue Jul 28, 2009 12:18 pm
Location: Gilbert, AZ
Motorcycle: 1976 GL1000
1994 GL1500A

Re: 79 GL1000 goldwing strange knock noise

Postby landisr » Sat Aug 20, 2011 9:54 am

It's possible it is just clutch noise, similar to a worn throwout bearing in cars of long ago. If it's noisy at idle with the clutch lever out, but quiets down when you pull the lever in, that's likely the issue, and nothing to worry about. A repair would not be worth the grief and expensive. Let us know what you find out (stethescope, mechanic's eval, etc).

Ron in MI
Beam me up, Scotty. There's no intelligent life down here.

mjb72
Posts: 3
Joined: Fri Aug 19, 2011 4:55 pm
Location: grafton, wi
Motorcycle: 1979 Honda goldwing GL1000

Re: 79 GL1000 goldwing strange knock noise

Postby mjb72 » Sat Aug 20, 2011 11:58 am

Pulling in the clutch does nothing to stop the noise, what often gets it to stop but not always is while at a stop engaging the clutch with a little bit of a jerk. Kinda like making the bike jerk just a litttle but not actually fully engaging the clutch. This doesnt work untill the bike is well warmed up though.

Thanks for all the replies

Myron

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dingdong
Posts: 2864
Joined: Thu Apr 08, 2010 8:35 am
Location: Oklahoma City
Motorcycle: 1976 gl1000
1993 gl1500
2004 NRX1800 Rune

Re: 79 GL1000 goldwing strange knock noise

Postby dingdong » Mon Aug 22, 2011 9:01 am

You may have a timing knock. Check the mechanical timing advance of the points to see if it is binding up. Might just need to be cleaned and lubed.


Tom

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