Motion Pro: How-To Video: 08-0411 Sync Pro Carb Tuner

In this detailed step-by-step video, Motion Pro's Chris Van Andel walks us through the proper calibration techniques and usage of one of our most popular tools.

[t.s.racing]

M.P., excellent well done video !!
Sadly a lot of negative comments from well meaning people who unfortunately didn't watch carefully and or read the directions. Perhaps they shouldn't even be working on their own motorcycle at this level. I have been Certified by HONDA as one of the first ever Pro-Technicians in the country back in the 70z. My career went on to Engine Building winning championships in NHRA, IHRA, as well as others in Automotive, Harley Davidson, and Honda/Kawasaki/Suzuki categories. I purchased this with confidence for tuning both my GSX-R 1100 Street bike as well as my Nitrous MANCUP PRO E.T. GS SUZUKI.

For those WILLING to listen, you should NEVER try to sync carbs UNLESS all of the other engine tune issues have been addressed!

If you question the engine sealing ability ie, low compression/poor leak-down, you're waising your time with the carbs. Valve lash/adjustment EQUALLY important PRIOR to carb sync. Older bikes pay particular attention to cam chain adjustments as well as point ignition dwell/gap, and timing. Idle Air mixture and individual throttle cables as well as idle stops. Clean air filter/filters EQUALLY important too. Thanks for listening, all the very best to all.

I wanted to add that I am so NOT trying to be Mr. Know it all, internet bully or etcetera, just trying to shed some light. Engine VACUUM will FOREVER be a excellent tool for tuning the internal combustion engine, its Physics. No matter how elaborate computers/engine management systems become, no matter how many valves, variable valve timing, etc., etc., vacuum will always be a CRITICAL factor in a internal combustion engine.

RIDE SAFE AND RIDE FREE !!!

[benficacm]

Just funny. So many commenters obviously never read the instructions, Fkd up, then blame the tool. This tool works flawlessly.

[harryohanson]

Best and the most reliable sync tool out there. Thank you guys for making awesome tools. This moto tech is always a fan!

[KFLY]

Update: I just used the synchronizer on both my Hondas cb350f and cb400f and man am I glad I bought these they just made my life a whole lot better... This tool rocks! 2 thumbs up!

[brunobullit]

bought the tool, watched the video and it worked perfect, thanks guys great product

[Chrisrx]

I learn something new. Awesome video! I took my carbs apart on my ninja 500, cleaned the jets and then put it all back together. Bike wasn't warmed up or anything like that. Turned the bike and the bike ran for like 15 seconds then shut off. Since then it wouldn't fire back up all. It was my first time dealing with carbs obviously. Didn't think much of it being out of sync and getting it warmed up good first. Didn't even have this tool im just turning and turning. I need another motor also lol.

[MotionPro]

Hi trido1986,


The master carburetor is generally the one that has the cables and the idle adjuster directly attached to it, but there are other configurations. Refer to your factory service manual for more detailed information.

An unstable idle is sometimes caused by fuel mixture problems, or possibly sticky throttle shafts. Extremely imbalanced carburetors can also contribute to this problem.

Please let us know if you have any further questions, -MP

[BTang]

Great how-to video. Thanks for taking the time to make it

[MotionPro]

In addition to the message below,

The vacuum range is also dependent on the fluid level in the tool, a low fluid level will reduce the vacuum limit, so that you may have yet another indication. This is the reason for the calibration screws, to accomodate for different vacuum levels, and also for small differences in the fill levels between each channel. This is also the reason that the scale is not marked with any units, as a mercury manometer would be.

[keving]

another thing is the tool had all sync screws counter clockwise out of the box i didnt know it untill i used it . so it sat in the box for a year before i even used it. never the less it did help out greatly for what i was doing.

[KFLY]

Just bought one of these going to give it a shot with my 1974 honda cb350 four thanks for the help!

[paulstaf]

Awesome video, thanks for doing it! Ordering one of these today!

[MotionPro]

So glad you're liking the video, estrelladelnorte1308 and Millionz27! We hope it's helpful to you :-)

[MotionPro]

Model specific information needs to be looked up in the service manual for each motorcycle.
With that said, with MOST inline 4 motorcycles, the carburetor or throttle body that has the throttle cables and idle adjuster connected directly to it, is the master. Again, the service manual has the final say.

[ProPotato]

Do all you guys complaining about this product even read the damn manual? Some of the complaints here are just stupid!
I just tuned my gixxer with this tool without a hitch and found cylinder 3 vacuum was less than half the others. Fixed them all up with this tool and my bikes purr is a lot smoother now and response has improved.
Great product! I will be doing all my mates bikes with this tool.

[shortbed]

Well I just used this method on my 93 zx7. The master carb is the one the main throttle cables go to usually. As far as another question, can it be done with the airbox off, yes, I have to with mine also. It helped my idle quality a bunch and it runs better but still has a weird issue when you foot take off its almost like it floods out...

[Videoboat]

Hello, I just got my MotionPro Sync Pro. I had to add some fluid to get it to 1/4 inch on each reservoir. Question, Manual, it states, that you're put a restrictor at the end of each hose. Then it says put a restrictor on the 6 port barb adapter then insert that into the short hose. If my math is correct, that means 4 restrictors for the long rubber tubes and one for the short tube. My bag is still sealed but I only see 4 restrictors. Is that correct? If so, how do you follow step 2?

[nancybazan]

hola retrictores van puestos en la parte superior o inferior de las mangueras?

Hello the retrictors are placed on the top or bottom of the hoses?

[ironcitymotorsports]

My rpm is set at x amount and I calibrate the tool just as you show here, then I twist the throttle on the bike a little and then let go of the throttle returning the rpm back to x amount. The calibration never lands in the same spot it appears to need re-calibrated, it's always out of calibration after the rpm changes (adjusting the synchronization on a bike will change the rpm just like it does in this video) I see that people including you... are setting the calibration and then removing the supplied mani, hooking up the lines to each intake port without ever checking to see if it lands in the same spot (calibrated) they just disconnect and hook up to the ports assuming it will stay true. If at x rpm the gauge is calibrated and then the throttle is changed of course without sucking the fluid out of the metering tubes then the gauge should still be calibrated when the throttle is returned back to the original rpm correct? mine does not. I wonder how many other syncpro gauges do not stay calibrated also and they just aren't realizing it because they do not vary the throttle after calibrating??? Thanks

[rrplz]

mine has a similar problem. The screws were all the way out and I was calibrating it. the 1st column went ok but when I turned the 2nd screw a tiny the fluid went straight to the top. I disconnected straight away but now it wont drop back down again.