Yamaha R3 Forums banner
1 - 19 of 19 Posts

·
Registered
Joined
·
313 Posts
Discussion Starter · #1 ·
there is a carburetor tool in the service manual to adjust the throttle bodies synchronization, along with AU$900 vacuum gauge.

a search of yamaha vacuum gauge, brings up vacuum gauge for carburetor.

isn't r3 using Fuel Injection, why does it use carburetor tools?
 

Attachments

·
Registered
Joined
·
16 Posts
measure engine vacuum at each throttle body to ensure they are balanced correctly, the old day you would use a dual vac gauge to balance the carbys on a multi cylinder bike, now we use the same type of gauge to balance FI throttle bodys,
 

·
Registered
Joined
·
313 Posts
Discussion Starter · #6 ·
What do you plug it with?

How easy is it to adjust using the motion pro?

What are signs for unsynchronised throttle bodies? Is it really important to sync?
 

·
Registered
Joined
·
717 Posts
What are signs for unsynchronised throttle bodies? Is it really important to sync?
Hard starting, not starting, rough idle, poor acceleration, rough running (exceptional vibrations) throughout the rev range... to name a few. Note that ALL of these symptoms can be caused by other things as well.
 

·
Registered
Joined
·
123 Posts
What do you plug it with?

How easy is it to adjust using the motion pro?

What are signs for unsynchronised throttle bodies? Is it really important to sync?
Both throttle bodies have a rubber cap that covers the vacuum hose. Remove the caps, plug two of the tool's four hoses onto them, start the engine and measure.

The expensive Yamaha tool is probably digital and tells you the actual pressure at each. The Motion Pro tool has four tubes with liquid, like thermometers, that give you a visual representation of the pressure difference. It's the same procedure with either tool. If the throttle bodies are off by 2 kPa, you need to adjust. Only adjust throttle body #1 and use #2 as the standard. All of this info starts on page 3-8 of your service manual.

Yamaha recommends you sync the TB's at 4000 mi (6000 km), then every 3000 mi (5000 km) after that.
 

·
Registered
Joined
·
313 Posts
Discussion Starter · #9 ·
Both throttle bodies have a rubber cap that covers the vacuum hose. Remove the caps, plug two of the tool's four hoses onto them, start the engine and measure.

The expensive Yamaha tool is probably digital and tells you the actual pressure at each. The Motion Pro tool has four tubes with liquid, like thermometers, that give you a visual representation of the pressure difference. It's the same procedure with either tool. If the throttle bodies are off by 2 kPa, you need to adjust. Only adjust throttle body [URL=http://www.r3-forums.com/forum/usertag.php?do=list&action=hash&hash=1]#1 [/URL] and use #2 as the standard. All of this info starts on page 3-8 of your service manual.

Yamaha recommends you sync the TB's at 4000 mi (6000 km), then every 3000 mi (5000 km) after that.
I dont have my manual at the moment and not sure the location of the adjuster, is the throttle body #1 adjuster on left of tank or right of tank, looking at bike to the front?
 

·
Registered
Joined
·
123 Posts

·
Registered
Joined
·
717 Posts
Avila, when identifying bike cylinder configurations, you always call out the cylinders as if you're sitting on the bike (facing forward). Cylinder #1 is always on the left, then they count up as you move towards the right side of the engine. V-twins cylinder #1 is the front, #2 is the rear. V-fours cylinder #1 is the front left, #2 is the front right, #3 is the rear left, #4 is the rear right.
 

·
Registered
Joined
·
123 Posts
Avila, when identifying bike cylinder configurations, you always call out the cylinders as if you're sitting on the bike (facing forward). Cylinder #1 is always on the left, then they count up as you move towards the right side of the engine.
Then I can't figure out for the life of me what the diagram from the service manual is showing.
 

·
Registered
Joined
·
717 Posts
Then I can't figure out for the life of me what the diagram from the service manual is showing.
Remember, items and orientations are called out as you're sitting on the bike. In the top left pic's view, you're standing next to the LH handlebar looking towards the throttle bodies and airbox (gas tank is removed). In the mid-page right hand pic (A) you're standing on the LH side of the bike looking at the gas tank. Pic (B), you're on the RH side of the bike looking at the gas tank. Notice the airbox in both pix for reference.
 

·
Registered
Joined
·
123 Posts
Remember, items and orientations are called out as you're sitting on the bike. In the top left pic's view, you're standing next to the LH handlebar looking towards the throttle bodies and airbox (gas tank is removed). In the mid-page right hand pic (A) you're standing on the LH side of the bike looking at the gas tank. Pic (B), you're on the RH side of the bike looking at the gas tank. Notice the airbox in both pix for reference.
Oooooh it's two separate pictures. I thought it was one big picture and it was so confusing, thanks for the clarification. You'd think in this day and age they'd put a color picture or hi-res photo in the manual.
 

·
Registered
Joined
·
717 Posts
Oooooh it's two separate pictures. I thought it was one big picture and it was so confusing, thanks for the clarification. You'd think in this day and age they'd put a color picture or hi-res photo in the manual.
I know, right? Wuddaya expect for a [choke] $75 book?
 

·
Registered
Joined
·
29 Posts
Has anyone bought the Motionpro tool? It says you need 6mm adapters for Yamaha's on the site, just wondering if that's the case or not? Wonder if anyone's done the throttle body sync? I watched a couple videos that were done on the R6 and it looks super easy.
I did my throttle sync almost two weeks ago. I posted my DIY tool on the Active topics under the Throttle Body Sync section. Hope that helps. I read a lot of people saying that they didn't think it needed to be done, however, my throttle sync was way off at just shy of 8,000 miles. This was the first time I ever did one and had great success at it. Oh, and BTW, I did not take the gas tank off to do the job. I just lifted it up and on the air box. I am happy I decided to do it.
 
1 - 19 of 19 Posts
This is an older thread, you may not receive a response, and could be reviving an old thread. Please consider creating a new thread.
Top