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Carb sync issues
OK, so I made some time today to attempt to sync my carbs with the loaner gauges that are going around. I got the lowers off and got everything hooked up, started the bike, and the gauges for carbs number 1, 2 and 4 are jumping around completely erratically. I mean they are moving so fast you can't even see them! Number 3 for whatever reason is steady as a rock (and looks to be low). Not sure what this indicates.....I'm guessing I have a vacuum leak someplace, but why on 3 out of 4 carbs?

Any ideas?
A rainy day off beats a sunny day at work any time..................
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#1 07-14-2010, 08:34 AM,
I don't know those gauges but do they require a restrictor? do you have the restrictor down by the carbs?

That's my best guess for "Simple" stuff.
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#2 07-14-2010, 10:23 AM,
Hmmmm. Not sure, I was following the procedure in the Honda manual, it didn't mention a restrictor. Unfortunately no instructions with the gauge set. I'll have to do some reading.
A rainy day off beats a sunny day at work any time..................
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#3 07-14-2010, 11:33 AM,
pm sent
1987 Aspencade 129K
1986 SEI 93K
2014 Tri-Glide HD 17K

Hancock,MD
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#4 07-14-2010, 12:27 PM,
Hmmm, the restrictor maybe the brass rods that came with the set. I set it around with just nipples and vacuum hose. Looks like I might have to include the brass rods.
[Image: VisitedProvincesMap.jpg]
[Image: VisitedStatesMap_zps8229ee64.jpg]
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#5 07-14-2010, 07:44 PM,
the brass rods will restrict the pulses some,what you can do is cut one rod up into about 1 1/2" pieces,solder them closed and drill some real small holes ,approx .010 in the rods and insert those pieces inline of the hose,this will dampen pulses

that is kinda what carbtune supplies with their kit,but theirs are small pieces of hard plastic rod
1987 Aspencade 129K
1986 SEI 93K
2014 Tri-Glide HD 17K

Hancock,MD
Reply
#6 07-14-2010, 08:01 PM,
85GL1200I Wrote:OK, so I made some time today to attempt to sync my carbs with the loaner gauges that are going around. I got the lowers off and got everything hooked up, started the bike, and the gauges for carbs number 1, 2 and 4 are jumping around completely erratically. I mean they are moving so fast you can't even see them! Number 3 for whatever reason is steady as a rock (and looks to be low). Not sure what this indicates.....I'm guessing I have a vacuum leak someplace, but why on 3 out of 4 carbs?

Any ideas?

There should be needle valves that inline thatyou restrict the amount of vacuum to minimize the needle bounce. I bought 4 oil filled vacuum gauges from McMaster-Carr the eliminates the need for the needle valves. The oil in the gauges dampen the needle bounce.
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#7 07-14-2010, 09:22 PM,
don't believe the loaner kits were supplied with any restrictors,i borrowed a set from steve's site and immediately went out and purchased a carbtune w/o going any further
1987 Aspencade 129K
1986 SEI 93K
2014 Tri-Glide HD 17K

Hancock,MD
Reply
#8 07-14-2010, 09:53 PM,
Got it. If you guys don't mind me hanging on to the gauges for a while longer I'll try to come up with something that fits the bill.

Or I can move the gauges along to the next stop, just let me know.........
A rainy day off beats a sunny day at work any time..................
Reply
#9 07-15-2010, 05:49 AM,
are the hoses rubber that go to the gauges? I wonder if you can do restrictors just like Carbtune does? A little pice of restricted tubing?
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#10 07-15-2010, 06:00 AM,
yep, they are rubber. I'm thinking a piece of copper soldered shut with a tiny hole drilled in it, or a plastic tube epoxied shut with the same hole. I may check the local parts jobber too, they may have some type of cheap inline flow restrictor I can add. Like my mom used to say, where there is a will there is a way.
A rainy day off beats a sunny day at work any time..................
Reply
#11 07-15-2010, 08:20 AM,
If you are willing to fabricate a restirctor in the lines please do, it'll help each person down the line on the loaner set.
[Image: VisitedProvincesMap.jpg]
[Image: VisitedStatesMap_zps8229ee64.jpg]
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#12 07-15-2010, 12:04 PM,
I have the same set as the loaner that is going around. There should be white plastic valves to use a restricters in order to settle down the needles on the gauges so you can get an accurate reading. I will try to post a pic of it in a bit. I am sure one could get this at home depot or any hardware supply store.
Mike                  
'84 Aspencade                                      
*Poorboy Conversion                              
* Bed-liner Black                                    

North Jersey Motorcycle Group
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#13 07-16-2010, 04:16 AM,
here is the plastic valve i have inline right before it attaches to the gauges.....each line has one. This is used to settle the needles to get a more accurate reading.


Attached Files
.jpg   gauge restricter (2).jpg (Size: 90.19 KB / Downloads: 601)
Mike                  
'84 Aspencade                                      
*Poorboy Conversion                              
* Bed-liner Black                                    

North Jersey Motorcycle Group
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#14 07-16-2010, 04:29 AM,
Excellent!! Thanks so much for the photo. I am off to the hardware to look for these, the photo will be a huge help!!!

Thanks again...
A rainy day off beats a sunny day at work any time..................
Reply
#15 07-16-2010, 04:55 AM,


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