1982 Aspencade Carb #3 Backfire - Advice needed


Information and questions on GL1100 Goldwings (1980-1983)
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Crmpacer
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Location: Lexington, Kentucky
Motorcycle: 1982 GL1100A Aspencade

1982 Aspencade Carb #3 Backfire - Advice needed

Postby Crmpacer » Mon Apr 29, 2013 1:43 pm



I have been working on my 1982 Aspencade for the last few weeks and have made some progress in the running performance. I have gone from a non-runner to quick start with a high (2000+) but rough idle.

I have been cleaning the system with Seafoam in an attempt to bypass the $250 cost of a high end carb rebuild kit but have discovered an issue that may be beyond the Chemicals capability.

After reading a thread on how to create a high pressure vacuum to dislodge stuborn varnish I removed my air breather system, used a towel to seal the intake and let the high revs create a vacuum.

In between sealings I noticed that it appeared that the number three carb was coughing into the intake.

I have shot a short video to see if anyone has seen this before and knows of a reasonable solution. I am pretty sure I have issolated my issue to the number three carb now I just need to decide the best coarse of action to repair it.





Thanks so much in advance.



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Crmpacer
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Re: 1982 Aspencade Carb #3 Backfire - Advice needed

Postby Crmpacer » Mon Apr 29, 2013 1:48 pm

[youtube][/youtube]





Here is another short video that shows a little more detail.

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virgilmobile
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Re: 1982 Aspencade Carb #3 Backfire - Advice needed

Postby virgilmobile » Mon Apr 29, 2013 2:57 pm

With a cold engine,run it at a idle ONLY for 8-10 seconds the shut it off...Gingerly tap each exhaust header....if all 4 are firing,they should be equally warm....Remember IDLE ONLY....NO reving it up.
I suspect you'll find #3 is cold....
It's most likely a valve adjusted too tight or sticking....
It certainly isn't keeping the fuel in the combustion chamber(valve leaking??)
If the valves seem OK,do a compression test on all 4 cylinders...they should be within 5psi of each other.
Another thing to look at after all that,is the timing belts...One or two teeth off and it will still run(badly) 3 teeth off and you bend a valve,more than that is a bad thing.

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Crmpacer
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Motorcycle: 1982 GL1100A Aspencade

Re: 1982 Aspencade Carb #3 Backfire - Advice needed

Postby Crmpacer » Mon Apr 29, 2013 7:18 pm

Would this account for excess fuel consumption? I have not ridden the bike up and down my street much and it seems that my daily tinkering and letting the bike idle is using up a lot of gas. Once I get the bike off the starting line it purrs like a kitten, is responsive and has all kinds of power. My trouble comes into play when I come to a stop sign or try to turn around.

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virgilmobile
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84 GL 1200 I

Re: 1982 Aspencade Carb #3 Backfire - Advice needed

Postby virgilmobile » Mon Apr 29, 2013 8:12 pm

sure.why not.Unburnt fuel always equals poor mileage

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80-GL100-INT
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Re: 1982 Aspencade Carb #3 Backfire - Advice needed

Postby 80-GL100-INT » Fri Jun 07, 2013 11:26 am

This is what mine sounds like only on #1 (Hindsight; Thread) Have you ever figured out the cause?
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Calzone
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Re: 1982 Aspencade Carb #3 Backfire - Advice needed

Postby Calzone » Fri Jun 07, 2013 3:41 pm

That sounds like every bike I have heard that needs the carbs rebuilt. Sorry to say but chemicals can only do so much. Time to become an expert carb technician, they really aren't that hard to rebuild you just need to be thorough.




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