popping through the carbs - Steve Saunders Goldwing Forums

 
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post #1 of 10 (permalink) Old 01-23-2010, 09:03 PM Thread Starter
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Hi everyone. i have a 1986 goldwing aspencade with 59k miles, i am getting a poping through the carbs, the plgs are new, and are burning perfectly, compression is at 170 lbs i am sure it is running lean. i am going to change all vacuum hoses, and thinking also about the air shutoff valve. when i hook my vacuum gauges to sync the carbs the gauges go totally crazy, i rev it up to about 2900 rpm and the gauges settle down, i know this is not normal, anyone have this problem before or any ideas,,thanks for all your help

Bill
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post #2 of 10 (permalink) Old 01-23-2010, 09:17 PM
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Air shut off valves or a couple of plug wires crossed.

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post #3 of 10 (permalink) Old 01-23-2010, 09:35 PM
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Take a look at the diaphragms on the slides. You may have a leak there.

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post #4 of 10 (permalink) Old 01-23-2010, 09:44 PM
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welcome aboard frenchy what did you do before it started poping or did it just start on it's own?

just do it and ask questions later. if you never start you\'ll never finish.

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post #5 of 10 (permalink) Old 01-24-2010, 08:00 AM Thread Starter
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the bike ran perfectly, last summer i rode from flordia to upstate new york without any problems, this is something that has just started, i have no crossed plug wires, have read all i can find online about this, and many seem to think it is the air cutoff valve. if that was bad would it make my vacuum gauges go crazy at idle? i am sure it has never been changed, i will change this valve and all vacuum hoses, and taking the plugs out they all are burning alike and thats a tan color, my manual does not say anything about this so i am hoping to hear from some of you that may have had this same issue,,again thanks for all your replies.when i get this cured i will post the problems.
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post #6 of 10 (permalink) Old 01-24-2010, 11:56 AM
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What type of vacuum gauges are you using? Have you used this same set of gauges on this bike before without the needles fluctuating at idle?

As you know, the vacuum to each carb changes / pulses at idle, unlike on say, a car engine where there is a steady vacuum at the carb base.
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post #7 of 10 (permalink) Old 01-24-2010, 01:13 PM Thread Starter
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yea, i have used these before, i even put them on mu buddies 1500 and they were seady at an idle, i tried them on the other carbs and all were the same, bring the rpm up to say 2900 they clear up.
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post #8 of 10 (permalink) Old 01-24-2010, 02:09 PM
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Have you checked the timing?
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post #9 of 10 (permalink) Old 01-24-2010, 04:28 PM
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In still think it's one of the diaphragms. Did you check them?

It doesn't take much of a pinhole or crack to make them not hold constant vacuum.

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post #10 of 10 (permalink) Old 01-24-2010, 08:03 PM
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If the popping occurs at times other than decelerating it's not the air cut off valve. That only comes in to play when the throttle is closed and the vacuum goes high in deceleration.

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