How to synchronize your throttle bodies.

[defkon99]

got me on the last one! great video!

[serchmarc]

how do you know the 1st vaccum you have from your syncros is the correct 1,you are just matching each other ,you dont have a value?or you have to have the manual to chek the nominal value from the factory and then regulate the carbs..and is pretty interesting how 1 and 4 has more vac and 2 and 3 less but match eachother at 4000rpm thats defenitly a factory manual recomendation.i man do you have some zx7r on sell or a friend thats sell 1

[TroyaE117]

You are right about synchronising at highway revs. Better still is to do it on a dyno, so that you are at highway revs AND under load. Not may of us have a dyno though.

I tried recently to balance the carbs on a two cycle Suzuki GT 500A. It was very difficult. The vacuum was so low that I had to rev it like crazy 6000 rpm, to get a reading on the Morgan carbtune system.

[oboi2104]

"The red bikes are faster" : HONDA FTW

[3ald3eaver]

@oboi2104 +1

[blunt2544]

It should be against the law to not have your carb synced i just did mine for the first time in about a year and my god its a new bike to me

[carsnwomen91]

where did u get the 4 cyl sunc tool? and u were adjusting on the fz6 that was FI or carb?

[lvizzle5150]

why would he use carb tune on FI? seriously dude c'mon

[carsnwomen91]

seriously? ur telling me? have u even seen my videos before u judge u don't even know what the tool is called. its called a manometer and it measures vaccum irregular to what kind of fuel delivery system. by sync'ing the throttle bodies ur essantially making sure that that each throttle plate/butterfly is opening at the exact same time equally. its the same on a carb. they too have butterflies or slides). ur lesson for the day. either learn something or ask or keep ur mouth shut. :)

[redoctoberz]

You don't adjust the throttle plate position on the FI FZ6. The screws adjusted in the video do not touch the throttle plates. You only adjust the idle air circuit- that is why Yamaha says to only adjust it idle.

[patkawasaki]

Great video. I'm gonna do the same with one of my bikes, but the only thing I'm not sure about is - waht do you set them to? As there is no scale on the marks, do you set then to number one cylinder?

Hope this question isn't too stupid.

[pacestick303]

I have an alfa romeo carbie sync tool that requires mercury...can i use alcohol instead? since mercury is no longer available. ive even been told to use brake fluid

[musiclovr2]

carb tunr pro (uk), go to the site its around 100 US dollars,ebay is higher than they are so stay away from ebay on that one

you need to sync the tool first!! ppl, the directions tell you how

[whynot9899]

sweet.

[CrustyBiker]

Wow, that liquid looks much smoother than the steel rods in the Morgan Carbtune Pro, How often do they need syncronizing?, is it worth a bike owner getting one. My ZX9r runs real rough at low revs, I think carbs are tuned for racecan it no longer has?, could it be that or valve clearances and carbs need syncing?

[vector6977]

steel rods? More like mercury. new carb sync bars use alcohol with food coloring. old ones used mercury.

[CrustyBiker]

No apparently it is steel rods in the Morgan ones, see the website, They are suppossed to be better for the reason that the gauges can be led down in a drawer or used upside down for low compression bikes like BMWs etc, they are not allowed to use Mercury anymore I believe, but I think the alcohol ones that you speak of do look more acurate and smoother..

[stogierogy]

Im new to this and want to try. How do you know what hose goes to which hose on the bike? I realize you said the pink band is for cylinders 1 and 4 but how do you know where all 4 individual hoses go? I have an FZ6 as well.

Thanks and great video.

[ElQuesoGuapo]

The cylinders are numbered 1-2-3-4 from left to right as you're sitting on the bike. Hoses 1 and 2 are on the left, 3 and 4 are on the right.

Connecting them in order is mainly important to prevent your confusion. If you hook them up in 4,1,3,2 or whatever order you want, you can still get a good synch, so long as you remember which is which when making adjustments.

My memory sucks, so I hook them up in order.

[stogierogy]

Great thanks. I guess if i bought the motion pro id have to get the 6mm adapter kit, no? Silly that its not included. At least it comes with the morgan carbtune but i like how you can adjust the levels on this before hand.

[simonspiers]

Thats a good point. I would rather have a lumpy idle and smooth midrange.

[JooKed]

Is it possible to sync them to the point where idle and 4k are the same? It almost sounds kind of cheap knowing that the bike isn't running 100% at idle but 100% at 4k or vice versa. If its possible to get thole whole range of rpms sync'd then wouldn't that be ideal? or not possible?

[ElQuesoGuapo]

You'd have a hard if not impossible time making them synch at both idle and higher revs. The differences show up because despite the best manufacturing practices, there will differences in parts which add up to differences in the behavior of each air intake. The synchronizing is designed to account for this and other factors such as compression differences, valve differences, and the position of each cylinder's intake in the airbox. All of that makes a difference.

[ElQuesoGuapo]

Don't think of it as the engine not running at 100%. That's not how it works. Think of it as some cylinders pushing harder than others because they're getting more air flow. Synchronizing gets the cylinders working at the same level of effort, which reduces vibrations and makes the bike sound and feel better.

You'll never get the engine synched perfectly at all throttle settings and RPM's. The best you can do is pick the range where you want the best behavior and target that.

[blk600cc]

Great video. My 04 R6 runs perfect but it does have 25K miles on it. the bike is getting the valves adjusted this week and then I plan on synching the throttle bodies. What mileage they should be synched at? Also, from a 1-10 rating (10 being the hardest), how hard is this to do by yourself or with the help of a friend? I do have mechanical experience but I just wanna be sure this is a job someone like myself can do. Appreciate it, look forward to your response.

[ElQuesoGuapo]

It's about a five. If it's your first time, make note of where the synch screws are set now. That way if you decide that you've messed things up, you can easily go back to the old settings.

[starchaser28]

Is this the same thing as syncing the carburetors? I think my 2000 R6 needs to have this done.

[ElQuesoGuapo]

Yeah, it's the same technique. The adjustment screws will be in a different place on carbs, but the theory and tools are the same.

[starchaser28]

After taking my R6 in to the dealer, they ended up syncing the throttle bodies and it made a huge difference! It idles much smoother and quiter (and the ticking sound is gone!). They used this same method for balancing at idle speed and around 4k RPMs

[captain150]

Awesome video. Looks like a fairly basic manometer. I'm sure a regular manometer would work fine.

But where did you get that one, is their a special name for it and how much was it?

Thanks.

[ElQuesoGuapo]

Thanks! The carb synchronizer is made by Motion Pro. But you're right, any manometer will do the job.

[Daniel508]

Great video man =) What is the measuring thing called? Where can I buy such a thing?

[newcomer9747]

How about placing the rear wheel on a threadmill? Lol just a crazy idea.

Then again even if you synched in on a dynamo it still doesn't account for the ram air intake. Am I right to say that?

[ElQuesoGuapo]

A dynamometer is pretty much a treadmill for the rear wheel, but it costs a few thousand dollars more. The main thing is to have the engine pushing against something.

I suppose that you could synch the throttle bodies while doing a burnout...

You're right about the ram air effect. It won't be there on a stationary bike. But the FZ6 doesn't have ram air anyway, so it's not a problem.

Besides, ram air doesn't really start to do anything until you're doing 100mph or more.

[newcomer9747]

Found some interesting stuffs.

w w w[dot]analogzone[dot]com/col_0­327[dot]pdf

[newcomer9747]

if you synced them at idle would they still be syncing at high rpm?

[ElQuesoGuapo]

It's not about RPM as much as it is about throttle opening. No two throttle bodies are alike, so they flow differently at different throttle openings. By synching with the throttles opened somewhat, you can better simulate the conditions that you'd get while riding on the road.

In the video the bike is on the stand, so the engine isn't having to work that hard. So it's not a perfect setup. Ideally, you could synch the bike on a dynamometer. But who can afford that? Not me!

[yellowbusguy]

Very nice video. I'm planning on synching my ZRX soon and this will be the 2nd time for this bike. I think I'll give the high rpm setting a try. Makes wonderful sense that you'd tune to where the machine is spending the majority of the time runnig.

[jeeperscreatures]

That`s great man. Thanks for posting. I`ll get a synch from motion pro and do it myself.

awesome!