76 gl1000 carburetor


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jimk
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76 gl1000 carburetor

Postby jimk » Tue Dec 01, 2015 6:32 am



One of my carburetors doesn't work at idle. Does anyone have advice on how to diagnose which one is causing the problem?



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Maz
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Location: Kent, UK
Motorcycle: 1975 GL1000K1
1976 CB500T
1979 CB750L
1990 Yamaha FJ1200

Re: 76 gl1000 carburetor

Postby Maz » Tue Dec 01, 2015 7:22 am

Pull the spark plug leads off, one at a time. If the revs drop, put the lead back and move on to the next one. When you pull one off and the revs don't change, you've found the cylinder that's not firing.

Maz
Nostalgia is not what it used to be!

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WingAdmin
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Re: 76 gl1000 carburetor

Postby WingAdmin » Tue Dec 01, 2015 10:18 am

Start the bike up from cold, and let it idle. Quickly touch your hand to each exhaust header. The one that is not getting warm is the dead cylinder.

Old Fogey
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Re: 76 gl1000 carburetor

Postby Old Fogey » Tue Dec 01, 2015 7:17 pm

WingAdmin wrote:Start the bike up from cold, and let it idle. Quickly touch your hand to each exhaust header. The one that is not getting warm is the dead cylinder.


Oohhhhh the Health and Safety jobsworths will have you for that!

Use a spray bottle, spray each one, the one that doesn't steam is the cold one.
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WingAdmin
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Posts: 17046
Joined: Fri Oct 03, 2008 4:16 pm
Location: Strongsville, OH
Motorcycle: 2000 GL1500 SE
1982 GL1100A Aspencade (sold)
1989 PC800 (wife's!)
1998 XV250 Virago (sold)
2007 Aspen Sentry Trailer

Re: 76 gl1000 carburetor

Postby WingAdmin » Wed Dec 02, 2015 11:58 am

Old Fogey wrote:
WingAdmin wrote:Start the bike up from cold, and let it idle. Quickly touch your hand to each exhaust header. The one that is not getting warm is the dead cylinder.


Oohhhhh the Health and Safety jobsworths will have you for that!

Use a spray bottle, spray each one, the one that doesn't steam is the cold one.


We're not the UK, we don't have the obsession with Heath and Safety that you do over there. :) I swear, it's almost used over there as an excuse for every asinine policy going.

"Why aren't we allowed to hit other bumper cars (dodgems) anymore - we just have to drive in a circle?"

"Health and safety."

"Oh, right."

(and yes, that's an actual policy in the UK - see Ten most ridiculous UK health and safety rulings)

As for the exhaust test, that's why I said to start the bike up from cold -it gives you a good minute of idling before the exhaust is hot enough to burn you, and that's lots of time to check to see which one is not warming up.

Alternatively, for the Health and Safety folk, you can use an infrared thermometer and just point it at each exhaust header in turn. :)

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Maz
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Joined: Tue May 19, 2015 4:43 am
Location: Kent, UK
Motorcycle: 1975 GL1000K1
1976 CB500T
1979 CB750L
1990 Yamaha FJ1200

Re: 76 gl1000 carburetor

Postby Maz » Wed Dec 02, 2015 12:21 pm

I was going to suggest that but they usually have a nasty, shiny red laser pointer on them and Health and safety say you could blind someone if you point it in their eyes! :lol: :lol:


Nostalgia is not what it used to be!


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