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Which Vacuum Synchronizer Do You Recommend?

  • Thread starter Thread starter ddaum
  • Start date Start date
D

ddaum

Guest
My 1980 GS550L is sucking gas like it's going out of style (which it is). I performed a full carb rebuild a couple months ago and I am getting by alright with my bench sync, but I still need to adjust the air screws and vacuum sync the carbs. Right now, my plug readings are fine, but I'm trying to increase gas mileage. I currently get about 30-35 mpg. I have a MAC 4-1 pipe, stock air filter, and stock jetting. The bike runs and idles great, just eats a little too much gas. So I'm in the market to finish the job.

Can anyone recommend a synchronizer AND where to get one on-line?

PS - I'm a big guy (260 lbs) so I'm not expecting miracles from my 550, just want to tune those carbies for the best efficiency.

Thanks a bunch
 
Morgan Carbtune

Morgan Carbtune

I was in the same situation as you not too long ago, and from doing a bit of research I came to a simple conclusion.

Morgan Carbtune is the best on the market for regular consumers. Perhaps professional garages/service stations may use something more sophisticated, but it will also cost MUCH more...

http://www.carbtune.com/

I would also like to highly recommend getting the "Carbtool" if you end up getting the Carbtune from them, it makes the tuning process a bit easier with the 2-in-one tool...

Its going to be a bit more than the one you posted, but from my research, i found many reviews that stated the "dial" type synchronizers are not as accurate for some reason.

I figured I'm going to guy this tool ONCE, so its worth the extra money no questions asked as it more than pays for itself the first time if you wanted to have the carbs synchronized by your dealer/shop.
==================================================
1979 GS1000E

"NEVER MESS WITH A GS"
"The less you know, the more you believe."
"We thought that we had the answers, it was the questions we had wrong."
 
Motion Pro

Motion Pro

well I just bought a motion pro mercury stick-type so it's the best I hope (haven't used it yet).

Search "carb balancer" on ebay and they can be got on line there.
 
Just a quick vote for the Carbtune II. Its spendy but I found it ver easy to use and accurate when compared against a known value, and tube to tube.

The mercury may be cheaper but A: You've got to work with Mercury and B: you'll spill or break it sooner or later.

The Carbtune looks like it could take quite a few drops from the bars with no problem.

/\/\ac
 
The pressure gauge (manometer) type you saw on ebay is a piece of cake to constuct for yourself.

Just get yourself 4 gauges going from -2 up to 0 bar. This will mostly do the trick. Fix them onto some piece of rail or strip and attatch fuel hoses. Some tweaking with hose clamps will get you a good connection to the carbs.

Set i've built cost under 20 Euros, not quite penny tech, but cheap enough for me :-D
 
I have used both the Merc type and the Morgan Carb tune and I would say both do a great job for the intended function. I will add this though, I don't like the fact that one little accidental flick a bit to hard on the throttle and you can suck Mercury into your engine. :shock: As a result of that, I prefer my Carbtune. For me, it is fool proof 8-[
 
rkubik said:
well I just bought a motion pro mercury stick-type so it's the best I hope (haven't used it yet).

Search "carb balancer" on ebay and they can be got on line there.
Click to expand...

I use that one. It's not been a problem but as Hoomgar said, don't whack the throttle open or closed, or you may suck liquid metal into your precious engine! It's as accurate as any gauge becuase it's liquid, which is the most accurate method to test vaccum. You'll need to store it upright and keep it away from kids. Mercury is nasty stuff. I remeber playing around with a big ball of the stuff in my palm as a kid.
 
XJeRge said:
The pressure gauge (manometer) type you saw on ebay is a piece of cake to constuct for yourself.

Just get yourself 4 gauges going from -2 up to 0 bar. This will mostly do the trick. Fix them onto some piece of rail or strip and attatch fuel hoses. Some tweaking with hose clamps will get you a good connection to the carbs.

Set i've built cost under 20 Euros, not quite penny tech, but cheap enough for me :-D
Click to expand...
Here's another take on that idea....this one qualifies for 'penny-tech' I think ;)...

http://www.xs11.com/forum/showthread.php?postid=4652#post4652


Tony.
 
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