Topic: 1 cylinder not registering during sync

[stevenmgrr]

I sync'ed my carbs about 2 months ago and things were running fine.  I removed my carbs yesterday to clean the slow jets and connected my Motion Pro sync gauge.  I noticed that #2 cylinder didn't register at all.  It was almost as if there was no vacuum.  The header for #2 was hot though.  The bike seems to run ok, but I am getting a slow return to idle.

Any ideas?

[kghost]

Set the slides all the same and try again.

[TwoTired]

You've got 4 vacuum tubes, try another on #2.  Check for a plugged manifold tap.

Cheers,

[stevenmgrr]

You've got 4 vacuum tubes, try another on #2.  Check for a plugged manifold tap.

Cheers,

I swapped the vacuum tube and #2 still doesn't register.  I stuck a very small screwdriver in the manifold hole and didn't find any obstructions.   All of the other cylinders register fine.  I am stumped.

[333]

If there's nothing wrong with the gauge, then it could be the intake valve is not opening.  But if the pipe is warm, that doesn't quite jive.

[Soos]

are you 100% sure no air leaks?
Sounds like a plugged vacuum port though.
Have you checked the condition of that intake lobe lately?(hate to even mention that since if it's worn badly... well that would be a bad day at best)




l8r