Bench sync

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millerdog
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Bench sync

#1

Post by millerdog »

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Can any one tell me why #3 throttle plate will not close all the way? All adjusting screws are backed out. It just will not close enough to cover the forward hole.
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1976 sorta stock GL 1000. 1997 VZ800 definitely not stock Suzuki Marauder. Ride em like you stole em!
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BlueThunder
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Re: Bench sync

#2

Post by BlueThunder »

Something is misaligned, misadjusted, bent, installed incorrectly or crud keeping it from functionally properly. An inspection would be in order to determine which of the aforementioned conditions exist.
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flyin900
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Re: Bench sync

#3

Post by flyin900 »

Did you have them apart or the carbs split from the plenum? Check to see if the adjustment part is assembled correctly by comparing it to the other adjusters. There are two small washers that are on the lower threaded adjuster pin and one should be on each side of the little fixed fork where the adjuster goes through. It is easy to not put that back together correctly and end up with both washers on either side of the little fork assembly.

Something could be bent or misaligned as noted above, so it’s hard to know without some background on those carbs or work that was done.
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millerdog
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Re: Bench sync

#4

Post by millerdog »

The sync adjusters are properly put together, and nothing appears to be bent. All the adjustments are backed off. A conundrum for sure.
1976 sorta stock GL 1000. 1997 VZ800 definitely not stock Suzuki Marauder. Ride em like you stole em!
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desertrefugee
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Re: Bench sync

#5

Post by desertrefugee »

I suppose it is possible the plate on the shaft is shifted. That would be unlikely ift he set has never been apart. In that case I would agree with the notion that something might be bent or damaged in the linkage.
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Re: Bench sync

#6

Post by millerdog »

Well, I cleaned these carbs up real good. Layed a straight edge on the linkages, and everything is true. Lubed every junction there was. Finally got all the throttle plates set to cover the first hole in the moth of the carbs. Everything seems to be working perfectly. Bolted them back on the bike, and I still have the exact same problem. I guess I’ll double check the timing again. I really don’t know what else to do at this point.
1976 sorta stock GL 1000. 1997 VZ800 definitely not stock Suzuki Marauder. Ride em like you stole em!
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BlueThunder
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Re: Bench sync

#7

Post by BlueThunder »

From the ham fisted book... have you tried to bend (gently) the slide shaft to fit correctly?
...Brian
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ericheath
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Re: Bench sync

#8

Post by ericheath »

Number three is the base carb. It is closed using the throttle stop screw. If your number three is that open, and you sync to it, the others will be that far open and —— a screamer at idle.

Set the number three first using the idle screw. You may need to back the other three carbs open for it to close, but it should close. Then bench sync the others to it.
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millerdog
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Re: Bench sync

#9

Post by millerdog »

I’ll have another go at it when I get some more time. Very frustrating. LOL. I had to walk away from it today...
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Old Fogey
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Re: Bench sync

#10

Post by Old Fogey »

If you have the idle screw on the quadrant backed off and the synch screw between #1 and #3, and #2 and #4 the same , then the adjustment at #4 is to blame. The most common cause is the seizure of the adjuster brackets on the #4 carb. Take the synch screw right out and make sure that the brackets will move relative to one another.
If they do, we need to look elsewhere.
If not, sometimes some penetrating oil will get them moving. If that doesn't work the throttle spindle will need to come out and the brackets split manually to clean the movement up. The early alloy arm carb sets (75 -76) need to be stripped to do that; the later ones and the GL1100 can be removed with the carb still on the set.
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