$1.55 Carb Sync Tool

[Schweisshund]

http://www.powerchutes.com/manometer.asp

I am still thinking about a larger tube connected to smaller ones and putting in a ping pong ball so it doesn't get sucked into one of the carbs. \\/

Outrageous ingenuity or foolhardy stupidity?

 

[SabreJim]

Interesting idea there, I may try this expensive venture :-D thanks.

Jim

 

[LeeGS550E]

Yes, that's the exact setup I used! Sorry I never got around to posting pics, but I guess I couldn't keep a smart fella such as yourself from figuring it out.

I'm a bit speculative about his price though. I think mine ran me more like $15 all told. Going to the hardware store is an expensive deal these days. Seems like I can't get out of lowes for less than $10, even if I'm just buying a handfull of hardware.

Anyhow, this setup worked great for me. Well worth the little bit of effort to put it together. After goofing with different types of fluid, I ended up using straight up water. Some food coloring might help. I tried oil and then tried simple green, and even tried lemon juice since I was having a Gin and tonic that evening. All of those things seemed to trap air in the tubing. Just use H2O.

 

[txironhead]

I'll agree it works great for twins (v or inline) but I've been told it's quite a hassle with four carbs since adjusting one carb can affect the other three. I suppose you could make two and run them side by side, but since it only measures the difference between two carbs, you could have 4 bars vacuum on the first two carbs and 6 bars on the second two and it would look even. You'd still end up having to swap out ports and retest. Still, it is an ingenious idea and like I said, ideal for two-cylinder engines.

 

[LeeGS550E]

It works for the 550's using the two-barrel type BSW30 carbs. The butterfly's are tied together on each side on those, so there's only one adjuster for balancing. I wouldn't expect to use it on the 4-carb setups either.

 

[Schweisshund]

Lee told me about this set up on an earlier thread. I am going to try this on my 550.

 

[omaharj]

Almost every BMW airhead owner has made one of those. Homemade engineering at it's best!

 

[spyug]

These work well on twins as mentioned. On the XS forum a lot of the guys put some form of restrictor in each end of the tube to limit the fluid bouncing and being sucked into the carb. The fluid of choice is usually ATF tranny juice. That's what I have in mine.

I would like to fab something like this ( i.e. double it) for synching the 750 but I can't see how it would work properly as txironhead as already noted.

If anyone has an idea for something similar capable of doing 4 carbs then I, among many others, would like to know.

Cheers,
Spyug.

 

[LeeGS550E]

For a four carb setup, could you use a 4-way tee? It seems that when all of the carbs are balanced, it would effectively be the same as the two-way setup....balanced carbs mean level fluid. Maybe I'll give it a shot, as I'm coming up on a carb synching soon.

 

[80GS750]

why not try making one with 4 tubes and a couple "t" fittings at the bottom. as long as oil seperates all the vacuum's wouldnt it work? you would just have to keep the oil and "t"s at the bottom so as to insure they all are pulling equally.....

if im wrong tell me, i really have no idea what im talking about.

 

[LeeGS550E]

why not try making one with 4 tubes and a couple "t" fittings at the bottom. as long as oil seperates all the vacuum's wouldnt it work? you would just have to keep the oil and "t"s at the bottom so as to insure they all are pulling equally.....

if im wrong tell me, i really have no idea what im talking about.

For a four carb setup, could you use a 4-way tee? It seems that when all of the carbs are balanced, it would effectively be the same as the two-way setup....balanced carbs mean level fluid.

Jinx! Somebody owes somebody a pop!

 

[80GS750]

yea we posted at almost the exact same time....

 

[ccoale]

i made one for my goldwing. it worked fine, synced up one side and then the other. i haven't attempted to use it on the GS yet. i used ATF for the fluid. if you make one, make it pretty tall if you use ATF....cc

 

[Guest]

This should work for a four-carb engine:

Actual implementation is left as an exercise for the reader.

Just blank off any legs that aren't going to be used, and make the vertical scale tall enough to account for any possible vacuum difference between cylinders.

Any ideas for a dense, engine friendly fluid?

 

[UTCiv]

Are the Suzuki 4 carb engines ment to be tuned as a foursome?

My XJ Yamahopper had four carbs, but the adjustment was bridged to create two sets of two. You sync'd the 1&2 then the 3&4 then the pairs were sync'd together to eliminate the see-saw effect of trying to adjust one and have all of the others change. Just wondering, my GS had this completed just prior to my purchase.

To help with the possibility of ingestion, could small "catch can's" be utilized similar to a brake bleeder vacuum setup, or do you guys think it would cause too much disturbance to provide a quick, accurate reading?

Run the tubing from a reserviour to the long vertical measuring section, then to an intermediate catch can prior to the length which attached to the measurement point.

 

[txironhead]

I'm all for making my own tools (I made my belt sander out of $3 worth of junkyard parts), but if I've got to go to all the trouble of tees, catch cans, regulators, etc. I'll just buy a professional set.

 

[Schweisshund]

I am thinking about doing this carb sync in the a.m. I am going to use brake bleeders in the carb vacuum port and attach the clear tubing to them to get an air tight seal.