How To: Make a 2 bottle synch tool

Everyone needs a sync tool to get the bike performing at its best. I have put together this post to assist all in this needed component for making your XJ alll that it can be & not spend a fortune doing it. Hope it helps.

What you need:
1. 2 bottles - I used 8oz glass baby bottles with oz measurements on them.
Purchased at Kmart for $5.95 + tax. You get 3 bottles which is good if
you break one.

2. 2 rubber plugs - bottle opening is 1 1/8"ID so narrow end of plugs need to be 1". Purchased at Lowe's $2 plus

3. Clear tubing - Approx 15', I used 1/8"ID tubing, it was tight fit on carbs
but worked fine. You may want to use 3/16"ID instead.
Purchased at Tractor Supply $3ea plus for 2 10' coils.

4. 1 quart of automatic transmission fluid - ATF


How you put it all together:
1. Drill 2 holes in each plug. Holes size based on OD of tubing used. Mine was 3/16"OD so I used a 3/16" drill bit. Make sure holes do not join or go thru the side of plugs.

2. Cut a length of tubing - Mine is approx 22" long - this will be the syphon tube between bottles that fluid will pass thru to equalize vac in each bottle. Push each end of tube thru one of the holes in each plug - put plugs in bottles & push tubing thru till end is touching bottom in each bottle.
Turn each plug so this tube is on the inside of the setup.

3. Cut 2 more lengths of tubing - I used 5' for each - Push one end of tube thru remaining hole in plug - push tubing thru till end is sticking out of plug. Do same with other tube in remaining plug. These are the lines you will connect to the vac fittings on your carbs for syncing. You may want longer or shorter lines depending on your needs - MO long is better.

4. Pull plugs from bottles, put 3oz of ATF in each bottle - put plugs back in & happy syncing.

5. Rack setup is in was stolen from the guest bathroom, just removed soap & lotion bottles.

Setup works great & is very accurate.

If anyone has questions ask away.

 

lol

that looks like a hooka

 

A hooka for carbs Flash.

 

Nice explanation greg, I love the rack, makes it look very professional!

 

Well, that has to be one of the niftiest tricks I've seen... Definitely going to give this a whirl! Thanks for the tip.

 

Ace, just had to sweet talk the wife out of the soap/loation rack from the guest bathroom.

DianCecht, your welcome. If The ATF gets sucked into your carbs it won't mess anything up. The bottles are graduated so you can see what level each bottle is at. It works really good.

 

greg, I just made one of your rigs, and it works great. I couldn't get rubber stoppers, so I got two bathroom-sink plugs, and used the ring that holds the baby bottle nipple on to hold down on the sink plugs, makes a nice tight seal.

 

Ace, good idea on the sink plugs. They were probably cheaper than the rubber stoppers. Glad you like the setup, I know it worked great for me.
Gregg

 

<--- Sync Noob.

So once built, you sync left two cylinders together, then right two, then both pairs? Correct? (only seen this done with carb stick w/ 4 lines that's why I ask)

 

dpawl, synch #4 to #3 (#3 is not adjustable on xj's) Synch #1 To #2, then syunch #2 to #3. You should be running like the wind after you done.

 

Im going to make this tool, but... what are you looking for while syncing? This is my first time doing this. Are you trying to get the fluid to stop flowing? A little instruction on how to synch would be great for this thread. Thanks, Lou

 

#3 is the "master" carb with the idle, essentially #4 carb adjusts to #3 independently of 1 and 2.
The bottles are hooked to 3 and 4, and you tweak until the levels are the same, but there may be a little back-and-forth even when they are perfect.
Then, connect 1 and 2 up, plug off 3 and 4.sync them together, then sync 2 and 3. As you adjust #2, #1 follows along, as it's connected to #2.
Problem is, if they were all way off, #3 and #4 will be off a little now, so you have to do it all over again, and , as you tweak-in your Pilot screws, the sync changes slightly.

Which is why I built the 4 tube set-up.
I can tweak the 4 Pilots and the 3 sync screws in any order and any amount without shutting down the bike.

 

Lou, your looking for the fluid leve in each bottle to be the same. If one bottle is higher the carb attached to that bottle is pulling more vac. Once you have the levels the same in each bottle, move to the other set of carbs. Hope that helps.
Gregg

 

I'm definatly gonna have to try this. I'm not gonna have my nieghbors Elec sync forever!
Question though! Where do you attach your vac Line for your petcock during the syncing of 1 and 2 and two and three. My Vac Line is connected to #2

 

SL, just attach it to any of the other vac fittings. The fuel valve doesn't care where the vac comes from as long asa it is getting vac.
Gregg

 

Either that or just set the petcock to PRI.

 

Brilliant! Didnt even think about that. Pri got me in trouble once so I'm tryin to steer away from it lol!

 

So I'm sync my carbs right now and have a question so I'm perfectly clear: I see a few people above mention the fluid should the same in both bottles BUT I'm thinkin it just needs to be Not Moving. whadayathink?

 

awsome, i've got tons of baby bottles laying around. the wife loves when i spend money on stuff for the bike, well maybe not but i do anyways. lol

 

DOLLAR each at dollar store/family dollar