Chugging and loss of power


Information and questions on GL1000 Goldwings (1975-1979)
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greenhorn_1958
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Motorcycle: 1975 GL1000

Chugging and loss of power

Postby greenhorn_1958 » Mon Aug 12, 2013 1:34 pm



My 1975 gl1000 has been a dream machine for me the last five years. How ever it has been in the barn for the last two. I recently had to start ridding it to work 35 miles a day. It ran good for the first tank of gas then all of a sudden at 70mph it acted like it was running out of gas but it had plenty. My first thought was the filter needed changed and I did so. Then the fuel line broke from the pump to the carbs.I thought ok loss of fuel pressure loss of power I changed all the fuel lines no change. I did discover that if the fuel valve was partly closed it ran a little better. During this time there was a thick dirty oil residue above and around the oil fill plug but it is in good shape. I have discovered a round canister looking thing with two hoses ata bed to it just aft of the fuel filter and above the oil fill plug. Is this a reciever for crank case air and could it be causing what I have dis robed if so how do I service it.



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virgilmobile
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Re: Chugging and loss of power

Postby virgilmobile » Tue Aug 13, 2013 8:23 am

Not causing the problem.disassemble and clean,its a collection canister for crank case vapor.
Your chugging is a rich condition:eg shutting the fuel supply helps.
Either the floats are sticking or absorbing fuel and increasing the fuel level.
I'd run some sea foam first.Even a dose right in the fuel line and let it set over night.
Pull the line and run the bike.refill the carbs right from the hose with your favorite snake oil.
It might help loosen things up.

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greenhorn_1958
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Re: Chugging and loss of power

Postby greenhorn_1958 » Tue Aug 13, 2013 9:19 am

I have run some sea foam through the fuel system how ever I didn't let straight sea foam set in the carbs. Would it be good to run some type of lubricant in the fuel now or should I just take the float chamber off and see if a float is full of fuel?

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80-GL100-INT
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Re: Chugging and loss of power

Postby 80-GL100-INT » Tue Aug 13, 2013 10:05 am

greenhorn_1958 wrote:My 1975 gl1000 has been a dream machine for me the last five years. How ever it has been in the barn for the last two. I recently had to start ridding it to work 35 miles a day.


I would say your carbs. probably need to be gone through completely. Sitting for 2 yrs dried them up and something is clogging them. JMHO
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Placerville
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Re: Chugging and loss of power

Postby Placerville » Wed Aug 14, 2013 1:19 pm

greenhorn_1958 wrote: SNIP "...I did discover that if the fuel valve was partly closed it ran a little better.

This would cause me to suspect that the rubber 'directional' gasket in the petcock is clogged, disintegrating or a combination of both. Your problem is obviously fuel related so you need to address each possibility, in order, from your tank to your carbs. First, make sure your fuel cap is venting properly. Then, pull your petcock and rebuild it. (Hopefully, you'll find the problem there.) The parts for your petcock are still available from Honda. Once rebuilt, you'll know it's no longer suspect. Next, make sure your fuel lines and filter are in good condition. After that, move on to your fuel pump. If it's not leaking from the weep hole on the bottom, chances are it's in good condition and pumping the correct amount of fuel (at the correct pressure) to your carbs. If the pump's leaking, replace it. If, after checking off these items you still have an issue, it's time to pull your carbs and rebuild them. I'm not in favor of 'liquid' cures for mechanical problems as they're always short term solutions that only put off the inevitable. If you need to pull you carbs for a rebuild, so be it.
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virgilmobile
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Re: Chugging and loss of power

Postby virgilmobile » Wed Aug 14, 2013 1:29 pm

Placerville wrote:
greenhorn_1958 wrote: SNIP "...I did discover that if the fuel valve was partly closed it ran a little better.

This would cause me to suspect that the rubber 'directional' gasket in the petcock is clogged, disintegrating or a combination of both.

I thought that if it ran better with it partially closed,that action would restrict the amount of fuel available to the carbs and effectively lean(starve) them....thus the diagnosis of too much fuel in the bowels.

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Placerville
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Re: Chugging and loss of power

Postby Placerville » Wed Aug 14, 2013 6:24 pm

virgilmobile wrote:
Placerville wrote:
greenhorn_1958 wrote: SNIP "...I did discover that if the fuel valve was partly closed it ran a little better.

This would cause me to suspect that the rubber 'directional' gasket in the petcock is clogged, disintegrating or a combination of both.

I thought that if it ran better with it partially closed,that action would restrict the amount of fuel available to the carbs and effectively lean(starve) them....thus the diagnosis of too much fuel in the bowels.


Agree. And, I didn't want him to overlook the petcock. Such a small thing and it can cause such big (and confusing) problems.


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