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TB Sync Strategy Question

guzziben47

guzziben47

Cruisin' Guzzisti
Joined
Jun 5, 2010
Messages
191
Do we all sync the TB's at 3000 rpm's? I had a boxer a while back, and the best strategy for that bike was to sync the carbs just off idle. When I hook my Stelvio up to the guage, I notice the synch changes at different rpms. In other words, if you get it in sync at 2000 rpms it will be a little off at 3000, so I think it would run differently, depending upon what sync point you pick. I'm not sure what the rationale is for sync'ing at 3000, but I'm also thinking it may cruise better if I sync at 4000, since that's where I would normally be running at steady throttle. Do you guys sync at 3000, like it says in the manual, or do you do it differently?
 
At idle you sync with the throttle body air bleed screws at 3000 or so with the throttle linkage tb balance screw on the left hand throttle body, The one towards the front of the bike the rear adjusting screw is verboten.
 
Yes. I also apparently needed a new meter. I went out and bought a SyncPro (I guess they don't have Mercury in them anymore). This time I closed the idle screws first, then synched the TB's at 3,000, then synched the screws at idle, then reset the TPS. The bike runs much better now.

Two things I have learned: (1) it is very important to get the bike set up properly; and (2) you have to do the set up yourself (like I said somewhere else on here, I don't think my dealer ever touched the adjusment screw).

My bike still bucks / surges a little at low rpm / small throttle openings, but the effect is much less pronounced, and much less annoying. Between removing the check vavle (I got rid of the tipover valve at the same time) and getting the TB's properly synched, I've got the bike to the point where I can actually enjoy riding it.

Now to put some miles on it (I've only gone about 1,500 miles so far) and see if she smooths out even more!!!
 
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