78 idles best with mixture screws all the way in


Information and questions on GL1000 Goldwings (1975-1979)
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spaceship
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Joined: Mon Aug 19, 2013 6:31 pm
Location: Winnipeg, Manitoba
Motorcycle: 1978 GL1000

78 idles best with mixture screws all the way in

Postby spaceship » Fri Aug 08, 2014 10:41 am



Just adjusted my valve clearances and sync'd my carbs. starting at the "2 turns out starting point" mentioned in the manual I tried to do the idle drop procedure to set idle screws but it wont idle smooth at 1000rpm, and wants to stall, it idled alright when I turn in the throttle screw to set it at 1400 - 1500.

So I played with the idle mix screws and found that it will idle most smoothly with all 4 screws all the way in, and i can set it to 1000rpm like that and it will idle happily. Any ideas why?



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spaceship
Posts: 5
Joined: Mon Aug 19, 2013 6:31 pm
Location: Winnipeg, Manitoba
Motorcycle: 1978 GL1000

Re: 78 idles best with mixture screws all the way in

Postby spaceship » Fri Aug 08, 2014 11:23 am

looking at the carb diagram and thinking to myself. could it be that the idle circuit is plugged on one or more carbs causing it to idle rough with the screws open, but with the screws closed it idles happily off just the main fuel circuit when the throttle set accordingly? is their any reason why this would not be just fine?

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spaceship
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Motorcycle: 1978 GL1000

Re: 78 idles best with mixture screws all the way in

Postby spaceship » Fri Aug 08, 2014 11:29 am

or maybe could it be the air cut off valve not allowing air to the slow air jet and causing it to be too rich with the idle fuel circuit operating? (ie leak hole plugged?)

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virgilmobile
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Re: 78 idles best with mixture screws all the way in

Postby virgilmobile » Fri Aug 08, 2014 12:38 pm

Or the floats are set too high.The engine should die if all 4 idle mix are closed off.The original black composite floats had a tendency to absorb fuel and sink,raising the fuel level causing your exact problem.I suggest drying the floats and dipping each one in polyurathane for 2 coats.dry very well and reset the float level by the book.Do not compress the little plunger in the needle valve(if it has one) when setting the level.The float must just rest on the closed needle.

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spaceship
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Joined: Mon Aug 19, 2013 6:31 pm
Location: Winnipeg, Manitoba
Motorcycle: 1978 GL1000

Re: 78 idles best with mixture screws all the way in

Postby spaceship » Mon Aug 11, 2014 4:27 pm

Since its running just fine I'm not going to pull the carbs this summer, ill wait to fall time and take a look at them. Interesting suggestion to dip the floats in polyeurethane. is there any risk of it breaking down and plugging up jets? is there a specific brand or kind that you use for this?




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