DIY Carb Sync Tool motorcycle car
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- Опубліковано 23 сер 2024
- How I made a Carb Sync Manometer at home for cheap $. Review of tool in my previous video that shows how it works. Hoses hook up to vacuum ports on carbs. With engine running, adjust carbs until liquid levels out on all four. Be careful not to suck ATF into carbs.
Restrictors---Dorman part# 493-021
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Or you could buy one through my affiliate link...amzn.to/2WwaTxq
I've used this with just a clear tube, no restrictors or connectors, just zip ties and cardboard, though it was this video I got the idea from (thanks). My bike was a twin andas long as your tubing is long enough and you're careful it doesn't suck up any fluid. Works great though and if I make another I will use the tips from the video. At the time I had the stuff on hand and was a long ride to the store so I made do, but it worked fine.
Cool !
thanks for this.
got some 1/4 clear tubing from home depot, had everything else. only needed a loop since only 2 carbs on the v-twin. no restrictor here but the ATF is heavy enough and I used a lot of tubing length and fluid, I think that helps the bouncing.
Thank you for taking the time to make this I didn't want to have to buy one and wait for it. The synch tool
Nice. Easy build. Good luck 👍
Hahaha! I'm thinking of making one myself. Currently owns a Yamaha FZR400R. The most horrible experience I ever had in riding:
Just cruising at about 60 mph when there was a truck that is crossing the street. I pulled to a stop to let the vehicle cross the road when my bike just died. Dead!
Did my best to run the engine but the revs are not rising. Revved the engine enough to get back idling, then tried to go back to my house. And it was running on just three, or even two cylinders. Every time there was something that would cross the roads I would feel like the end of the world...after all, I was 30 miles or so from my place!
For making the sync tool, I would use 3/8 or 1/2 acrylic tubes and the restrictors on the tubes directly, in order to reduce inconsistencies. Would use five-feet 1/4 hoses as well, just add an adaptor for certain vacuum plug sizes(they say 6mm on my bike). Because of the tube size, I would use general-purpose oil or a suitable light-weight lubricant that would not hurt the engine if it sucks some(2-stroke oil becomes sludgy when cold). I would add restrictors on the self-balancing part of the tool if needed.
What I wanted is to make a single tool to do meet the needs not only for me, but for all my buddies who ride with more than a single cylinder. And since the tubes are acrylic, I can also fuse them together and add a stand!
And, about FI-equipped bikes, you still need to synchronize them 'every six months' as the R6 service manual says. You would not notice the difference, but every last adjustment should count into something great. And valve clearances affect the synchronization too, so watch out. For carburetor-equipped engines, you do not really need to follow the specified 'vacuum pressure' specified by the service manual. This is due to the fact that balancing everyone(the carburetors) would turn your idle speed higher or lower. You just adjust the idle speed adjustment screw and you are done, making sure the levels are same. You would love to check synchronization from idle, to mid-redline, then at maximum power, and check if the levels are still the same. Now if all is good, hooray! Do NOT forget to put the blanking plugs/bungs/screws back on the vacuum check holes.
Thanks for sharing the information.
ルイ02
Great plan ! My worst.... Clutch cable end breaks off in a not-so-nice part of town. Rigged it enough to get home. I now carry a cable kit.
desrecording Also happened to me. But still can do clutchless but run below 4000 rpm. Horribly slow, but the only way to run it without turning the transmission into scrap metal. Heeeh!
I'm literally watching this video to sync the carbs on my fzr400!
Can i put petrol instead of transmission oil like you did ? I think that would be the safest option and petrol is liquid enough, i am tuning carbs on gsxr 750
syncing a fi bike is the same ;p
you can still use your tool to sync the throttlebodys vacuum
It is not just 'you can'. Because the synchronization tool is the same for both FI and carb. Even service manuals says that
What is FI?
@@carlosagua1666 fuel injection
Tried but the manifold sucked in all the liquid ıts why
Brilliant. Thanks for sharing. What's the diameter of the clear tubing, Desrecording? I'm looking at doing this for my Triumph Thunderbird Sport 900.
Dorman part# 493-021
I had a hard time finding that part # at my local stores, but it seems Dorman # 47311 is the same part, but in a single package instead of a package of 10 like 493-021. Thanks for the video.
@@shanefrank3281 cool.
Thanks man.. Everybody hit the like button.
I would like to see how this works...
ua-cam.com/video/RxkwZ-NDsVs/v-deo.html
Brother, if you set the air screw of the throttle, then the rpm will also change??

The idea is to set the carburetors at the same vaccuum level, and therefore equal throttle position. You then adjust the idle separately at the linkage.
If you (like me) have two totally independent carburetors with dual cables and no linkage, then it's a whoooole lotta fun getting the idle where you want it. Turning screws and turning screws and turning screws until the fluid level is equal and idle is reasonable.
My XS650 is set at 850 or so right now. Lower idle sounds better, but it's where I had to stop for fear of losing my mind.
I need to borrow it
@@bruceunderhill575 you can have it. (Buffalo NY)
Hey man great video. i'm currently restoring a marauder 800 and need a sync but the tools cost too much, going to make one of these, but do you know where i have te most chance of finding one those restrictors? dont think my local auto store has them.
Part # is in description. Check online
Dear man,i cant bleed hoses,how i can bleed?tnx
The problem wont be if it burns or not.. the problem is that any liquid that enters cylinder will exceed compression and break the engine (piston rod, or valves, etc)
I made one on a 19inch tall board with fluids filled up to about 6 inches high and extra amount of tubing to run to the bike. does it matter how high I have it?
I don't think it matters. Level with bike I would think
@@desrecording it was a complete an utter fail. I got soo annoyed with how jumpy the fluids were, I went out n bought 4 vacuum gauges and with valves to open and 0 each gauge out. I would never recommend anyone do it the fluid way. But I’m glad it worked for those who have done it.
Dear man,can i use tube 0.4mm diameter?
Any size should work. (With restrictors installed)
Im try it suck oil all intake manifold its why help me
I can not seem to find the restrictor as well. Where did you get them?
is call Vacuum reducer and you will find it at any auto parts
Where did you get the restrictors from? I tried doing it without but its impossible.
Vacuum Reducers and you will find them at any Auto Parts
what is the red fluid
Transmission fluid
@@desrecording can i replace it with engine oil 20w50
Would this same principle work with 6 carbs?
Probably. Just need more tubing
what size hole do the restricrors have?
Not sure. Dorman #493-021
Dear man.How mach hose need for all?
30 ft.
@@desrecording thanks man,Best regard
hi do I have to cut the tubes same length
I did. To keep pressure uniform.
@desrecording i thought about that. But at the same time, the vacuum tubes on my bike are different lengths, so either it doesn't matter, or I'm SOL
What are those at the end of each hose?
Explained in the video
@@desrecording I don't understand, I don't know English.
5/8 od 5/16 id