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Discussion Starter #1
Planning on checking my tb sync
The book says you need a special extension fuel line and harness to get the tank out of the way. Can it be done without those?
Also I have carb sticks but not gauges with actual numbers on them. What gauges have others used?
Input is appreciated!
 

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No one has synchronized their own throttle bodies??


I have... well, I tried.

You have can rest the back of the tank on the moto with the fuel line plugged and the front of the tank on a table or other sturdy surface next to the bike. No need for fuel line extension.

The part about checking the actual pressure is where I’m sure I did it wrong. I do not have a device to set my RPMs to what is specified in the manual (says not to trust the reading on the moto gauges) and when I hooked up two pressure gauges they were bouncing all over the place. I wasn’t able to get a steady reading.

At the end I just eye-balled it on the center of where the dials were going back and forth for both of the TBs.

I hope at least the tank info is of some help. Please do share if you manage to find a good way to set the right RPM and get an accurate pressure reading!

Edit: I used the pressure gauges from harbor freight. Not sure if they are terrible or I’m just an idiot. Could be both


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Something tells me that most Ninja 300s go through their whole life without a throttle body sync.
(I hadn't even heard of such thing! :()
 

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Discussion Starter #6
Thanks for the replies. I dont have a tach that will work for this application. After evaluating the procedure it seems that the need for accurate rpm and accurate vacuum readings go hand in hand. Since the fi system is pretty primitive I'm sure it relies on those adjustments being within a specific range to have the correct mixture (especially at idle).
My theory is that as long as the throttle bodies are close to begin with they can be brought into sync with just carb sticks or and manometer (I'll probably use a manometer as its easier to see small differences)
The way to avoid vacuum gauges bouncing all over is to add restriction to the vacuum hoses. This smooths out the pulses coming from the intake runners.

I've found that (in carbureted engines. I don't see why this one would be any different) small changes in synchronization can make decent changes to part throttle vibration etc.

I will see how far apart mine are. If a small adjustment will bring them into sync I'll split the difference between the two adjusters and call it good. If they are way out I'll have to come up with something better.

Thanks for the input!
 

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Thanks for the replies. I dont have a tach that will work for this application. After evaluating the procedure it seems that the need for accurate rpm and accurate vacuum readings go hand in hand. Since the fi system is pretty primitive I'm sure it relies on those adjustments being within a specific range to have the correct mixture (especially at idle).
My theory is that as long as the throttle bodies are close to begin with they can be brought into sync with just carb sticks or and manometer (I'll probably use a manometer as its easier to see small differences)
The way to avoid vacuum gauges bouncing all over is to add restriction to the vacuum hoses. This smooths out the pulses coming from the intake runners.

I've found that (in carbureted engines. I don't see why this one would be any different) small changes in synchronization can make decent changes to part throttle vibration etc.

I will see how far apart mine are. If a small adjustment will bring them into sync I'll split the difference between the two adjusters and call it good. If they are way out I'll have to come up with something better.

Thanks for the input!


Keep us posted. I’d like to know what works for you so that I can try next time I’m doing a major service.

Good luck!


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@Kennylxix Any update on this?

I'm doing the 15k miles service and I saw the 'Engine vacuum synchronization'. It looks like you have to spend a pretty penny between the fuel line extension, the accurate tachometer and the vacuum gauge. I wonder if it's worth.
As Mal said, probably most of the N300 go through their lives without this service. Also, mine rides so well, that I'd really like not to touch it.
 
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