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Old 07-21-2013, 09:23 AM   #1 (permalink)
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Default GL1200 Single Carb

The single carb setup I installed is working fine with one exception: As this uses a Solex Pict34-3 VW carb I have to go to the VW sites to get info. My bike suddenly refused to idle at all. I finally traced the problem to a sticking cutoff solenoid. I cut the end of the plunger off in order to get it to run. This was used to keep a hot air-cooled VW engine from running on. It has been said that it could prevent a hydro lock in case the float valve failed. However, as it is referred to as an air cutoff valve sometimes I'm not sure that would be the case on the Goldwing. So, the question would be, can I just leave it disabled, or should I replace it? Maybe some who have done this conversion will have an opinion.
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Old 07-21-2013, 10:30 AM   #2 (permalink)
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Sticking?
How is it "sticking"?
Being a solenoid, once voltage is applied to it there should be nothing within the carburetor that will have it "stick" in the out position.
You've either a bad 12V feed to it (most likely a bad grounding of the carburetor) or a defective solenoid (either electrically or in the shaft).

Did you run a ground wire to that electrically isolated set-up? If so, where did you attach it? Was it a good ground?

Those solenoids rarely fail.
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Old 07-21-2013, 11:01 AM   #3 (permalink)
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PS ...you could just put a threaded plug in place of the solenoid if you trust the float needle to always do its job.
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Old 07-21-2013, 02:47 PM   #4 (permalink)
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Ground is run to frame. Tested 12V at solenoid contact. Pulled solenoid off and grounded it and it didn't work. With the end cut off it is effectively a plug anyway. My question, which I failed to articulate was does the solenoid cut off the air as the name implies, or does it cut the fuel supply to the idle circuit?
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Old 07-26-2013, 10:10 PM   #5 (permalink)
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Default Mileage

OK, I know that the single carb setup is supposed to result in slightly decreased fuel milage. I seem to be getting better mileage (45mpg) than before. Of course, 4 carb setup needed work so that may be the answer.

Another theory I have is the bike seems to be able to cruise in a higher gear than before without lugging around town. I was talking with a friend, Leonard Wood, the original mechanic of the famed NASCAR Wood Brothers Racing. He tells me that longer intake manifolds, as is the case with the single carb setup will result in more torque and less top end if flow rates are similar. That would fit in with reports of others of lower top speed (not that I will ever know). What I do know is the bike seems to be able to run in OD at a lower speed than before without bogging down. Lower RPM = better MPG? "At low revolutions per minute (rpm), the speed of the airflow is increased by directing the air through a longer path with limited capacity (i.e., cross-sectional area) - and this assists in improving low engine speed torque."
This was found in a Wikipedia article. Just an FIY
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Old 07-26-2013, 10:43 PM   #6 (permalink)
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Quote:
Originally Posted by CaptainMidnight85 View Post
Sticking?
How is it "sticking"?
Being a solenoid, once voltage is applied to it there should be nothing within the carburetor that will have it "stick" in the out position.
You've either a bad 12V feed to it (most likely a bad grounding of the carburetor) or a defective solenoid (either electrically or in the shaft).

Did you run a ground wire to that electrically isolated set-up? If so, where did you attach it? Was it a good ground?

Those solenoids rarely fail.
Well, I got a new solenoid and grounded it against the negative battery terminal while running a wire directly to the positive terminal. It sticks as well unless you slightly nudge the plunger with your finger. Go figure
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Old 08-28-2013, 09:48 PM   #7 (permalink)
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Blueridgerunner,

What Carb & Manifold setup do you have?
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Old 08-28-2013, 10:43 PM   #8 (permalink)
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Blueridgerunner,

What Carb & Manifold setup do you have?
not trying to speak for BlueR here but I'm sure he's using "Juan's" from e bay with Solex carb.
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Old 08-29-2013, 10:24 AM   #9 (permalink)
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I think Blueridgerunner & Sergie are running the Solex 34Pict3
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Current Bikes,
1983 GL1100 72K 32DFT Single 2-bbl Progressive Carb, and Runs Excellent,
1984 GL1200A 55K Reverse Trike Project, Single 2bbl. Progressive carb
1986 GL1200 Interstate, Now Naked, She just turned 41K
1988 GL1500/6 Phantom Grey 74K single 2 bbl carb conversion
1999 GL1500SE 45K Silver
2005 Burgman 650 17K
07' M109R 1855 miles 130hp 120ft lb torque Reverse Trike 99' Miata front suspension
2013 Honda NC700X 2k, AVG 77.68mpg
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Old 08-29-2013, 01:36 PM   #10 (permalink)
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Quote:
Originally Posted by westgl View Post
I think Blueridgerunner & Sergie are running the Solex 34Pict3
Yes! You're right
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