Backfire - Steve Saunders Goldwing Forums

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post #1 of 24 (permalink) Old 10-13-2007, 08:54 PM Thread Starter
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Some time ago, I posted a question about my 84 Aspy that it would tend to backfire when I decelerated. It happened almost everytime when I was gearing down for a stop. Nothing when I was riding. Most of the suggestions had to do with the exhaust pipe gaskets. No, that wasn't my problem. Then, I learned that it could be possible that I needed to sync my carbs. I finally broke down todayand got a carb tuner made by Pro Motion: http://www.motionpro.com/motorcycle/...de;%3C-sup%3E/

It took me 15 minutes to put it together and learn how to use it, 25 minutes to remove the lower farings and 5 minutes to actually tune the carbs. And yes, they were what I would consider "way off". It took me another 20 minutes to get everything screwed back together and I was off for a test ride.

I was blown away. 98% of the backfire was gone! My total cost for the tuner was about $103.00 from a Kawauski dealer. My Honda dealer didn't have one, of course. Now that I know what I'm doing, it shouldn't take over 15 minutes, start to finish. I'll be checking on this on a regular basis. Anyway, I just though some of you with older machines would be interested.

Bob
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post #2 of 24 (permalink) Old 10-13-2007, 09:12 PM
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There is also an air return valve(if memory serves) located on the underside of the plenum, that enrichens the carb mixtures upon decelleration and puts an overly rich mixture into the exhaust pipes to prevent detonation or backfiring. If this valve fails, there will be backfiring. It is vacume controlled.

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post #3 of 24 (permalink) Old 10-14-2007, 06:09 PM
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Ken is right, the valve is one of the more common causes of backfire on decel. We call it the anti-backfire valve. The GL1200 carbs really need balancing every 5-6000 miles.

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post #4 of 24 (permalink) Old 10-14-2007, 06:25 PM
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There are 2 diaphram devices located under the carbs on a 1200. One is the air cut-off, most common cause for the back fire on "deceleration". The other is the anti-after burn. The air cut-off you can find just about everywhere. The anti-after burn, not. Honda doesn't even show a part number for it. Has anyone ever come up with a replacement for one?

1984 1200I Candy Cobalt Blue over Bright Silver Metallic w/ Black & Silver Marbling. Poorboy alternator. Progressive springs and a comfy gel seat.

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post #5 of 24 (permalink) Old 10-14-2007, 07:28 PM Thread Starter
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Keystone742 wrote:
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There are 2 diaphram devices located under the carbs on a 1200. One is the air cut-off, most common cause for the back fire on "deceleration". The other is the anti-after burn. The air cut-off you can find just about everywhere. The anti-after burn, not. Honda doesn't even show a part number for it. Has anyone ever come up with a replacement for one?
Oh goodie. Something else to deal with.

OK, can it be tested and/or repaired? If so, how? If not, can replacements be purchased?

Bob
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"We sleep soundly in our beds because rough men stand ready in the night to visit violence on those who would do us harm". ~George Orwell

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post #6 of 24 (permalink) Old 10-15-2007, 06:23 AM
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Yes there is a vacuum test and it's outlined in the manuals. Can't remember exactly how, but you put so much pressure in and then switch and take so much pressure out. Do you have a manual? You can downloadone here from the site.

1984 1200I Candy Cobalt Blue over Bright Silver Metallic w/ Black & Silver Marbling. Poorboy alternator. Progressive springs and a comfy gel seat.

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post #7 of 24 (permalink) Old 10-15-2007, 06:40 AM Thread Starter
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Keystone742 wrote:
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Yes there is a vacuum test and it's outlined in the manuals. Can't remember exactly how, but you put so much pressure in and then switch and take so much pressure out. Do you have a manual? You can downloadone here from the site.
Yeah, I have one. I'll have to do some reading on it. Thanks.

Bob
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post #8 of 24 (permalink) Old 10-15-2007, 06:04 PM
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W5BLT,

Nothing really to add to this, but I couldn't resist making a comment about the callsign!

Paul

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post #9 of 24 (permalink) Old 10-15-2007, 06:42 PM Thread Starter
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W5BLT,

Nothing really to add to this, but I couldn't resist making a comment about the callsign!

Paul

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Paul,

My call sign formerly belonged to my father. I acquited it when the vanity calls came out. It's circa 1932. Pretty old.

Bob

Bob
It\'s not the destination in life that matters.
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"We sleep soundly in our beds because rough men stand ready in the night to visit violence on those who would do us harm". ~George Orwell

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post #10 of 24 (permalink) Old 10-16-2007, 12:26 PM
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Bob,

Wow! Very neat! I immediately thought of the fun you could have with things like Field Day with that call!

Paul
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