Topic: Carburetor Synchronizer

[mycb750k6]

OK I got it this time. I had the K&L gauge type and the Morgan carbtune mixed up.

[mycb750k6]

I started this thread a couple of weeks ago and ended up buying the Morgan. Arrived a couple of days ago. Very nice and simple to use (but those carb screws are hard to get at). Anyway I didn't adjust anything because of the wild spread, 14, 18, 18 and 20 reading 1-4. So I figure I'll go back and tune everything before attempting the sync. I just wanted to see how they compared to each other.

[HedNut]

On this topic.... did anybody mention that they had one of these Sync's from ebay?  I am very interested in buying them...but looking for some "reviews" from fellow SOHC'r's
Cheers

[mycb750k6]

That's what I was going to get before everyone here convinced me the Morgan was the way to go. No synching of gauges required plus, and I guess it's a big plus, the four tubes of stainless right next to each other are easier to compare than looking at four gauges.

[westondc]

On this topic.... did anybody mention that they had one of these Sync's from ebay?  I am very interested in buying them...but looking for some "reviews" from fellow SOHC'r's
Cheers

i've got one. works great for me, but you have to remove the plastic lenses on each gauge to calibrate it first (didnt mention this in the instructions). its a little awkward holding the gauges while your syncing but the mount has holes on either end. i connected a small bungee cord and hung them on my handle bars. after reading about the Morgan Carbtune i'm wondering if i should have went with that option, seems a bit simpler to work with.

[SHELLFISH]

I have a Sonco model 364 4 guage set up. It's an old unit and I should probably sync the gauges!

[ron.cieri.313]

Another Morgan fan and user!

[westondc]

here's a vid of the type of sync gauges i have

but the guy in the video didn't use the damper valves on the tubes. this keeps the needles from bouncing around.

[dave500]

you have to use the damper valves or itll damage the guages!hes asking for trouble with the tank propped up like that aswell.,rig up a lawn mower or weed eater tank.

[Tnutz]

On this topic.... did anybody mention that they had one of these Sync's from ebay?  I am very interested in buying them...but looking for some "reviews" from fellow SOHC'r's
Cheers

i have one too. works great.

[secondhandcash]

I actually came across this thread from google, but please don't lynch me for it   I am the in-house Ebay associate for a second-hand store.  Recently we had a mechanic bring in a few things, with which we have no idea what to do.  We have researched and figured out the others, but the one I am stuck on is an original Honda (Made in the US by Honda America) vacuum gauge kit/ "Carburetor Syncronizer" (as it says on the gauge faces).  The interesting part is that it is in the original box and looks completely unused.  The instruction sheet (one page) is dated December 1977 and it has a signature and date of 5/17/78 on the front as if that was the purchase date. 

So my question is- Who would want this?  I know you can probably buy carb syncs cheaper and probably even better quality, but there has to be someone with a preference for nostalgia.  Any help just pointing me in the general direction would help immensly, and I apologize for interrupting your forum.

-Patrick

[MickeyX]

My guess is... since you are an feebay seller... sell it there. Not here. 

[von_Wanderlust]

Wow, an Ebay associate?

You are correct about it not being accurate now that it is over 30 years old. The pneumatic air calibrations that were originally made in the place of manufacture will be different with any unit produced today - basically, changes over the years in the gas makeup of the air environment will provide incongruent readings when used in todays atmosphere (for both sea levels and at altitude!). Also, as you note, it is a vacuum gauge, and there is no guarantee that the vacuum in each individual gauge (or tubing!) hasn't degraded in the past three decades through incorrect storage and handling procedures which may have caused the componentry (seals/valves/valve guides) to dry out and become brittle. I think your best bet would be to take it into your local Honda technician, ask them to use their flux capacitor to check and possibly recalibrate the unit before progressing any further.

Good luck! 

[secondhandcash]

Cool, I think we might have a flux capacitor in one of our stores.  I can save time and just recalibrate it myself.  Thank you for the helpful hints.  It's going to take some work but I think I would rather know if it is in proper working order before selling.  I know one guy with a digital vac gauge, and I'm thinking the only was to figure out if it can still be accurate it to test it next to/ calibrate it alongside 2 different known correct readings. I can use an engine for one but I am trying to figure out where/ how I could set up a constant vacuum in the higher end of the gauge (20+ in/Hg).  In any case thanks for the tips, I'm gonna go try to find a flux capacitor now.

[westondc]

... I'm gonna go try to find a flux capacitor now.

you might locate one in a DeLorean DMC-12 

[secondhandcash]

Yea I probably should have been a little more blatant now that I'm reading over my last post  . Frankly the only thing I'd bet on finding on a DMC-12 is too much useless steel and a leftover coke stash from Delo's "Emergency Capital Fund".

[Yoshi823]

you have to use the damper valves or itll damage the guages!hes asking for trouble with the tank propped up like that aswell.,rig up a lawn mower or weed eater tank.

I use one of these...http://www.motionpro.com/motorcycle/partno/08-0032/

As far as gauges are concerned, i've always used this style...http://www.davida.co.uk/type.php?id=gauges

It should be noted that this operation should only be performed after everything else has been done ie.plugs,tappets,air filter,air screw adjustment etc.

On my old CB750F2, the adjuster on #2 was fixed. #1/3/4 were then synced to match the fixed one. But on my Exup1000 the adjusters are between the carbs, so #1/2 were synced, then #3/4, then the adjuster in the middle synced #1/2 to #3/4. The carbs on a friends CBX1000/6 were more difficult to get right, but I borrowed a friends set of four gauges & then synced the carbs using 2 of the set of four & my set. But on a friends ZZR1100 the carb syncing was even easier & made such a differance it was surprising...you could stand a shaped coin on the tank without it falling once the job was done.

[mycb750k6]

Yay! Here are my results:

[dave500]

mine are italian and look similar yoshi,on a red angle steel holder,and came with a great selection of brass screw in adaptors and nylon tee and y pieces for fuel lines           

[Yoshi823]

Those are very similar to the ones that I have...but the damper knobs in the picture are far more useful.
I seem to remember that the blanking screws on #2/3 on my 750F2 were always difficult to get to, especially with a hot engine to work around. Back in the day that I had my 750, it would have been useful to have a system like they have/had on Kawasaki bikes, where there was a spigot that was blanked off when the spigot wasn't needed for connecting to the gauges. On my Exup1000 and my R1 I now have some adapters permanently in place for quick connection to the gauges, as burning my hands is not on my list when servicing an engine. These adapter kits I bought from Morgans in Ireland as they were too cheap to replicate myself.