jbrown
Active Member
I use a Harmonizer to sync the throttle bodies at idle. It's easy to take the bike for a drive with the harmonizer attached, so I did.
Unfortunately that alerted me to the fact that the intake vacuum is only balanced at idle, not under acceleration or steady cruise.
Since the throttles share a common shaft, it seems like the only way to affect a change at cruise is via valve clearance adjustments (shims), or fuel mixture adjustments (ECU flash). The air bypass screws make little to no difference at cruise.
I know the difference I see is minimal (only 25 mbar, or 19 mmHg), and I'm not concerned, but the engineer in me needs to know if there is something I've missed and there really is an easy way to balance the throttle bodies at other than idle. I'm just curious. Does anyone here know? (The manual pretty much just says if you look at the throttle bodies wrong, you have to replace them as a unit.
)
Unfortunately that alerted me to the fact that the intake vacuum is only balanced at idle, not under acceleration or steady cruise.
Since the throttles share a common shaft, it seems like the only way to affect a change at cruise is via valve clearance adjustments (shims), or fuel mixture adjustments (ECU flash). The air bypass screws make little to no difference at cruise.
I know the difference I see is minimal (only 25 mbar, or 19 mmHg), and I'm not concerned, but the engineer in me needs to know if there is something I've missed and there really is an easy way to balance the throttle bodies at other than idle. I'm just curious. Does anyone here know? (The manual pretty much just says if you look at the throttle bodies wrong, you have to replace them as a unit.
)
