Carb jetting GL1000 - Steve Saunders Goldwing Forums

 
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post #1 of 10 (permalink) Old 03-27-2006, 09:21 PM Thread Starter
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After searching all the threads about overheating - I'm beginning to think I may have a carb jetting issue - thermostat was replaced, timing set - bike continues to run near top end of the heat gauge ( in the end of the white zone). The previous owner said it had run this way for him all the time - but tracking down the history of the bike it was originally sold in 1978 in California - made its way several years later to Montana - where I bought it and brought it to Alberta. We are around 3000 feet above sea level here - anyone know what size of jets I should be using?

Merv
1978 GL1000 1974 CB750

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post #2 of 10 (permalink) Old 03-28-2006, 10:34 AM
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How do your plugs look? A very lean mixture will cause overheating. Rich mixture the opposite. A lean mixture will cause the plugs to look a very pale color or even white. A rich mixture will cause them to look blackand sooty. Proper color is a medium brown to tan color.

Is your bike running okay other than the overheating? If so it's probably not the mixture.

And the cooling system on a GL1000 should be more than adequate to compensate.

Check to be sure your cooling system is not plugged. A broken thermostat will cause overheating. Also make sure there is enough coolant in the radiator by taking the right shelter cover off. The radiator cap is toward the front and the coolant reservoir will sometimeshave a "bathtub ring" that fools people into thinking its full. Open the top and look down inside.

If the coolant is low and you don't have any external leakage your head gasket could be blown. Check for steam or very wet-feeling exhaust (after its warmed up). Also check for coolant in the oil, or milky looking oil.

Aside from leaking around the shaft seal I haven't heard of water pumps failing. The radiator could be plugged internally.

Does your engine overheat while inderway or just when standing? Check for proper operation of the electric fan. There could be a birds nest blocking the fan, or a fault in the wiring, switch, or fan itself.



Marco,
Albuquerque, NM

\'77 GL1000 (sold)
\'08 Suzuki V-Strom DL650
\'99 Ducati 900ss
\'97 Honda XR650L
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post #3 of 10 (permalink) Old 03-28-2006, 10:42 AM
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Another thing to check on your bike would be the 7-Volt regulator. If that regulator is going bad it could be sending more voltage to the temp gage than needed, indicating a high temperature.



Marco,
Albuquerque, NM

\'77 GL1000 (sold)
\'08 Suzuki V-Strom DL650
\'99 Ducati 900ss
\'97 Honda XR650L
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post #4 of 10 (permalink) Old 03-28-2006, 10:45 AM
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newtscoots wrote:
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After searching all the threads about overheating - I'm beginning to think I may have a carb jetting issue - thermostat was replaced, timing set - bike continues to run near top end of the heat gauge anyone know what size of jets I should be using?
Youll chase jets to eternity and not fix it. It should have stock jets - the ones the engineers intended for it to have. Once youve verified that there are no gross problems with the carbs (mainly proper float and fuel level) and they are clean, then overheating is usually related to failed electrical systems.
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post #5 of 10 (permalink) Old 03-28-2006, 11:38 AM
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Dave Campbell wrote:
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Once youve verified that there are no gross problems with the carbs (mainly proper float and fuel level) and they are clean, then overheating is usually related to failed electrical systems.
What? Other than the fan, are you kidding me?



Marco,
Albuquerque, NM

\'77 GL1000 (sold)
\'08 Suzuki V-Strom DL650
\'99 Ducati 900ss
\'97 Honda XR650L
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post #6 of 10 (permalink) Old 03-28-2006, 11:45 AM
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Ive been there and fixed that too many times since about 1992 to kid you.
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post #7 of 10 (permalink) Old 03-28-2006, 11:57 AM
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Dave Campbell wrote:
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Ive been there and fixed that too many times since about 1992 to kid you.
Sure... why don't you let us in on your little secret.



Marco,
Albuquerque, NM

\'77 GL1000 (sold)
\'08 Suzuki V-Strom DL650
\'99 Ducati 900ss
\'97 Honda XR650L
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post #8 of 10 (permalink) Old 03-28-2006, 01:52 PM
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well, the fan on my 79 was not coming on and I fixed that, but it was still overheating. turns out the radiator was plugged - a dunk in the hot tank at the rad shop fixed this. you might want to do this (it was $40 US in Boston area) as it is cheap insurance in the long run.


1979 1000 nekkid
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post #9 of 10 (permalink) Old 03-28-2006, 09:19 PM Thread Starter
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Thanks for all the tips guys - I've got it pinned down to the 7V regulator - when I found out what I was looking for - new question - any one know where I can get a new one? I've checked out E-Bay - the only one on there looks pretty sad.

Merv
1978 GL1000 1974 CB750

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post #10 of 10 (permalink) Old 03-28-2006, 11:45 PM
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Here's a new one one... ebay number 4626204089

Marco,
Albuquerque, NM

\'77 GL1000 (sold)
\'08 Suzuki V-Strom DL650
\'99 Ducati 900ss
\'97 Honda XR650L
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