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Carb Sync Tool

 
    
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grizztracks
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Joined: 24 Feb 2005
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Location: Scio, NY

PostPosted: Sun Jan 22, 2012 8:46 pm    Post subject: Carb Sync Tool Reply with quote

I made my own sync tool out of 12' of 5/16" vinyl tube filled with a little transmission fluid. I mounted the tube in a "U" shape on a 4' 1X4 pine board and filled it so I had around 22" of fluid in each side of the "U". You can only sync two carbs at a time but I've had good results with it. #3 carb (stator side) is preset so you sync 1 and 2 to it. There are only two screws to adjust (3 screws on 4 cylinder engines) which are located between 1-2 and 2-3. It's an easy adjustment that can make a big difference in performance.

Here are a few pictures of my Carb Sync Tool and it being used to sync the carbs on a Vector.
Note: never run the engine with only one side of the sync tool connected or you'll suck the oil out of the tube.



Carb sync (tool connected for #2 adjustment)


Carb #2 out of sync


Carb #1 slightly out of sync


Sync'd carb

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08 Nytro RTX:: DDM HID's>Trailtank>MTX cooler>GrizzGusset>CurveXS>Steering relocate>MtnTech 43" A-arms>MtnTech skid plate>Schmidt Bros Stage II>Ohlins rear shock>Fox EVOL>136" Ice Attack w/relocate
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TOMBOB
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Location: Saranac,Michigan

PostPosted: Fri Jan 27, 2012 11:45 am    Post subject: Reply with quote

GRIZZTRACKS,
quesstions
1. is 12 ft of hose total or for one side or booth

2. at what speed do you test idle /wot

3.do you fill the tube up to 22" +/-

4. sync two carb's to 3rd at the all same height

5. 5/16 hose o.s.----?

thanks for all infor you give for this site

TOMBOB

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TOMBOB
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Location: Saranac,Michigan

PostPosted: Fri Jan 27, 2012 3:06 pm    Post subject: Reply with quote

GRIZZTRACKS,
43 degrees in michigan today so made your sync tool. less than twenty buck. booth 1&2 carb were out of sync. very simple idea but very effective.

thank again, very helpful

TOMBOB

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Ulmer clutch kit,HyGear twisted spring on the mono,Starter Saver,prosport digital temp gauge,open windows on the track,belt removal tool,PP wheel extenders
25 years riding 30,000+ miles ROCO on yamaha
"SUMER SUCKS SNOWMOBILE TOURS"
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aVenture
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Joined: 14 Mar 2005
Posts: 363
Location: Quebec

PostPosted: Fri Jan 27, 2012 4:10 pm    Post subject: Reply with quote

This differential type of guage always worked good for me, compared to the absolute type sold on the market. It is very sensitive, and contrary to a absolute connection, you can give it some gas after equalizing carbs so to have a feel how close the slides are opening together. All in all, this is not an absolute reading you need but the difference between cylinders, and it does it more precisely. The industrial one i bought for my bike has been collecting dust.

Oh.... i use antifreeze..
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grizztracks
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Joined: 24 Feb 2005
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Location: Scio, NY

PostPosted: Wed Feb 01, 2012 4:45 pm    Post subject: Reply with quote

TOMBOB wrote:
GRIZZTRACKS,
43 degrees in michigan today so made your sync tool. less than twenty buck. booth 1&2 carb were out of sync. very simple idea but very effective.

thank again, very helpful

TOMBOB


Sorry I didn't get a chance to answer your questions before you put together the sync tool.

I used 12' total of 5/16 O.D. tubing which is just enough to mount it on the board and still reach the carb's. I cut about 4-5" off one end of the tube and inserted a tee for the fuel pump hose which is removed from the carb being sync'd.

I filled the tube with transmission fluid so that both sides have about 22" of fluid measured from the bottom of the "U". I found it easier to actually suck the transmission fluid into the line rather than trying to pour it in.

Syncing the carb's should be done at an idle with the engine at operating temperature (1350-1400 rpm). After each carb adjustment bring the engine rpm up then allow it to return to idle so that the carb settles. This is a differential type sync tool so all that matters when making an adjustment is that the fluid is level in both sides of the tube which indicates that the two carbs are balanced.

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08 Nytro RTX:: DDM HID's>Trailtank>MTX cooler>GrizzGusset>CurveXS>Steering relocate>MtnTech 43" A-arms>MtnTech skid plate>Schmidt Bros Stage II>Ohlins rear shock>Fox EVOL>136" Ice Attack w/relocate
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11 Yamaha Stryker
---------------


Last edited by grizztracks on Sat Dec 22, 2012 8:35 pm; edited 1 time in total
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4strokeluvr111
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Joined: 27 Aug 2011
Posts: 366
Location: NW Wisc.

PostPosted: Mon Feb 06, 2012 5:26 pm    Post subject: Reply with quote

IMO....anybody with a carb'd Vector (any carb'd Yamaha 4S???) that likes to tinker even a little bit on their sled should build one of these!

Easy to build and use. The hardest thing was getting the right amount of tranny fluid in! Head Bang

Thumbs Up Thanks Grizz! Thumbs Up
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Horizonls
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Joined: 23 Feb 2012
Posts: 3

PostPosted: Thu Feb 23, 2012 8:50 pm    Post subject: Reply with quote

How would you proceed to syn an Rx-1 with 4 carbs, only two carbs have the vac lines attached to them and the other two are capped off?
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grizztracks
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Location: Scio, NY

PostPosted: Thu Feb 23, 2012 9:43 pm    Post subject: Reply with quote

If a carb has a vacuum line for the fuel pump pull it and reconnect it to the tee in the sync tool line. If their is no vacuum line then pull the cap off, connect the sync tool and then use the cap to plug the tee in the sync tool line.
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08 Nytro RTX:: DDM HID's>Trailtank>MTX cooler>GrizzGusset>CurveXS>Steering relocate>MtnTech 43" A-arms>MtnTech skid plate>Schmidt Bros Stage II>Ohlins rear shock>Fox EVOL>136" Ice Attack w/relocate
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05 RS Vector ER
11 Yamaha Stryker
---------------
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theewarrior
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Joined: 17 Apr 2011
Posts: 121
Location: Canada, Cape Breton

PostPosted: Fri Jan 11, 2013 9:14 pm    Post subject: Reply with quote

All I can say is this works ....thank you!!!
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gosnek
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Joined: 02 Jan 2011
Posts: 12
Location: Arkona,Ont,Canada

PostPosted: Sat Jan 12, 2013 7:44 pm    Post subject: Reply with quote

Made one of these today,did a super clean on carbs was still having some issue, warmed up sled and hooked it up carbs where out of sync man what a difference after the sync. This site rocks This Site Rocks
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grizztracks
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PostPosted: Sun Jan 13, 2013 7:17 pm    Post subject: Reply with quote

Glad I could help Thumbs Up
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---------------
05 RS Vector ER
11 Yamaha Stryker
---------------
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Bradford
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Joined: 07 Jan 2007
Posts: 367
Location: NB Canada

PostPosted: Wed Feb 06, 2013 4:31 pm    Post subject: Reply with quote

I built one of these too. The only differnece is I used 2-smoke oil instead of transmission fluid. Finally found a use for that oil!
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