Unable to sync right side to left

[maleko89]

The right-front sync screw is bottomed so I split the rack and am going over the linkage. When idle thumb screw is all the way down I can still push down on the throttle linkage and the butterflies go down just a tiny bit. Is that normal?

I have tried to sync w/o the throttle cables attached at junction box and it makes no difference. I swapped sync gauge hoses, cleaned the Carbtune and same results. The right side vacuum reads pretty high and is over 5 bars above left side with #4 sync screw bottomed.

 

[tugla]

you do have the vboost valves still right and they are closed? did you have the rack apart before for anything or just now its not syncing?

 

[maleko89]

Vboost is stock and closed. I just finished breaking the carbs apart and cleaning them. I probably screwed up a throttle linkage.

 

[dannymax]

Mark, I had this same problem on Sallymax. Think something got bent in Sal's wreck, but I backed out the adjuster screw and using a pair of needle nosed vice grips, bent the tab back a little. This will give you the additional adjustment needed.

Actually, the tab is quite soft and bends easily. I think they might be built in 'adjustment points' that the factory uses to account for manufacturing variables.

 

[maleko89]

Thanks Dan-o, I'll try that!

I have always had a bit of an issue with that sync screw. Usually the bike goes to perfect sync just as that screw bottoms out but not this time. I did get in an accident with the bike but that was 10 years ago. Thanks again!

 

[tugla]

Mark, I had this same problem on Sallymax. Think something got bent in Sal's wreck, but I backed out the adjuster screw and using a pair of needle nosed vice grips, bent the tab back a little. This will give you the additional adjustment needed.

Actually, the tab is quite soft and bends easily. I think they might be built in 'adjustment points' that the factory uses to account for manufacturing variables.

+1 was thinking a linkage bent and not getting full adjustment.

 

[dannymax]

Thanks Dan-o, I'll try that!

I have always had a bit of an issue with that sync screw. Usually the bike goes to perfect sync just as that screw bottoms out but not this time. I did get in an accident with the bike but that was 10 years ago. Thanks again!

No problem Mark-o, just be sure to back the adjustment screw out so the tab has room to move. You can do this with the rack on the bike.

 

[maleko89]

Dan, sent you an email.

So, you bent the middle tab towards the adjustment screw? The middle tab is the one the screw pushes against.

 

[timax]

You too:confused2: Let me know what you find. I bought a new carbtune have yet to try it out.....

 

[maleko89]

Sorry, forgot to respond on the final outcome. First things I did was lube the butterfly linkages and throttle cables. Then, I took a pliers and bent the tab on the right-front sync screw. It's the one that the last spring sits on. So you have sync screw/spring, tab, spring, tab.