HELP: Throttle Body Adjustment Screw Specs
I have a 2005 R6 and I'm trying to sync the throttle bodies. Problem I'm having is that TB1 has considerably less vacuum than TB2, TB3, and TB4. I was able to get 2 and 4 pretty close to 3, as the service manual states TB3's air screw should not be touched and used as a standard reference point. The issue is that now I have TB1's adjustment air screw screwed all the way in(creating the most vacuum possible) and it is still out of sync. It's as if I need more adjustment room, to create more vacuum in TB1 to get it to equal TB3. The service manual states that each TB should have a vacuum pressure of 180mmHg at idle, and that the difference in vacuum pressure between any two TB's should not be greater than 10mmHG. I don't have an accurate vacuum gauge but I measured how many turns out my TB3 air screw was; 1 5/8 turns out. I bought the bike used so I don't know if anybody has messed with TB3's air adjustment screw.
Does anybody know how many turns out Throttle body #3's air adjustment screw is on a 2003-2005 R6, or any R6S straight from the factory?
I know there is a lot of variability in the TB's vacuum pressures overtime due to wear in parts, but according to the manual, TB3 is the standard and is never to be adjusted. All other TB's are to be synced to #3. So what I figure is that TB3's air screw should always be the same, or at least close to it's factory setting. Valve clearances were adjusted on my bike at 25,800 miles about a month ago. Now it has 26,400 miles, idle RPM when warm is about 1,400-1,350, and she's all stock except for a Akroprovic slip on. The bike has been running OK, except for cylinder 1 being more rich than the others(darker plug) and the idle loping a little(which I've heard is common and normal for the R6) which I think may be attributed to the lower vacuum pressure.
If anybody knows or could check how many turns out there TB3 air screw is, it would be greatly appreciated. Just thought I'd ask before investing in a quality vacuum gauge. I just need to rule out if my reference TB has been messed with or not before I start looking for vacuum leaks.
"Never sad, because I ride blue."
Last edited by Dr.smr; 01-07-2017 at 12:43 PM.