Cheap Carb Sync tool

[portugeezer]

You can make one of these for next to nothing and they work great!

[wjnfirearms]

Inquiring minds want to know P-man. Could you be specific in what you used to build this contraption and how you got it to work. I understand the methodology behind the mercury tubes or gauges, but this intrigues me.

Doesn't syncing the carbs require a specific reading to be obtained on all 4 and how did you get it to equalize at the reading, which I also am unfamiliar with for our bikes.

God, I love McGyvering!!!!

[portugeezer]

Ok, The wood is 1X4 and a 2X2 to keep it from tipping. I have a garage door hinge on there so it folds for storage. The tubing is aquarium tubing but be sure to buy the heavier guage stuff so it doesn't kink or get sucked shut. The staples come with garage door openers for the wires but you can use regular harware store wire staples. The fluid inside is two cycle oil. It's blue so it's easy to see and if you suck some in it just burns off harmlessly. As for accuracy this is more accurate than vaccum guages. Now since the carbs get synced in pairs you don't need 4 ports. You first put the tubing via small brass fittings you will need to buy on carbs #1 and #3. Those are on the right side of the bike. Adjust until the fluid inside is pulling in neither direction. This this is super sensitive and the tiniest adjustment of the screw makes a big difference. Once you get it right tighten the adjuster recheck it swear a few times do it again and then lock it down with locktite. Now do the two on the other side the same way. Once both sides are done you put the tubing on the back ports of the carbs on either side and do it again. This is super accurate and will make a huge difference! There is a how to on the syncing part here. I have never used a factory made guage for this. I had doubts about using it on a 4 cylinder until I did it but I don't anymore. This is the best and most accurate way to sync carbs!

[portugeezer]

Oh, I didn't answer one of your questions. There is no specific setting it is only important the the vaccum be the same on each carb.

[virgilmobile]

It works....I can prove it too....
Mine is a little different but the idea is the same.
One improvement could be done if needed.....If one carb is pulling a much higher vacuum at first run ,it will suck the oil through the tube....I cleared out the mosquitoes once with that.

The add on to your design is a small syringe size container on each tube near the top.
Large enough to hold 2X the oil in the tube.
That way the oil will never get sucked past it and into the cylinder

[WingAdmin]

It works....I can prove it too....
Mine is a little different but the idea is the same.
One improvement could be done if needed.....If one carb is pulling a much higher vacuum at first run ,it will suck the oil through the tube....I cleared out the mosquitoes once with that.

The add on to your design is a small syringe size container on each tube near the top.
Large enough to hold 2X the oil in the tube.
That way the oil will never get sucked past it and into the cylinder

I like your reservoir idea, excellent thinking. It will simply suck bubbles up through the fluid instead of sucking fluid into the engine.

I once had a same experience when running a can of Seafoam through my old 94 Explorer - I pulled a vacuum hose off the intake and stuck it into the can, to allow it to suck the Seafoam into the intake, and through the engine. The engine stumbled a bit when I started, so I reached over and cranked over the throttle bellcrank while holding the hose in the can. It went through that entire can of Seafoam in about 30 seconds. It started to blow an enormous cloud of white smoke out the exhaust, and continued to do so for almost a minute afterward. There was no wind that day to disperse the smoke, so by the time I was finished, I had a huge, towering pillar of white smoke coming from my driveway. I had a police car stop at the foot of my driveway to make sure my house wasn't on fire, I guess he had seen the smoke from some distance away.

[virgilmobile]

I've filled my area with some kind of smoke so many times even the neibours quit asking what's going on

[portugeezer]

I just shut the engine off when it sucks too much on one side then turn the screw and start it again. I keep doing that until it's close. This is the second manometer I made. The first one was the hanging type. I used trans fluid in that one but I like the two cyle oil better! This one works fine for me. It's simple and does the job. No need to fancy it up.

[wjnfirearms]

Great job, guys. I'm going to have to make me one of those.

As to the Seafoam, the smoke like James Bond's Aston Martin is supposed to happen when you suck it into the intake. When I tell customers about doing that, because it does work, I caution them about the smoking mess while it burns off. I mention that if they have close neighbors, they might not be on so good terms after with them. I first learned about the gobs of smoke when I did it to a Subaru and I'm surprised someone didn't call the fire department.

[cmyoch]

I made one of these a couple years ago to sync the carbs on my XS650 twin. Worked like a charm. I made carb adapters out of some brass fittings that I cut threads on and it works just the same as explained. Mine is taped to an old yard stick that I hang from the handlebars. A very cheap and easy tool to make and use!