Right cylinder sucking air

[Sn34ky]

Got a probleme... just found that my right cylinder is sucking air...

Hard to find something on that here... What can it be...

Cam?
Timing?
Leak?

Why the right is sucking and the left one farting really nice??

I don't have too much experience in twins, but I know that air sucking can come from a inverted camshaft... but what about this motor?

thanks

 

[weekendrider]

You have a vacuum leak? If you have the barbs in the intake manifolds check the blind plug. They will crack on the ends.

 

[Sn34ky]

You have a vacuum leak? If you have the barbs in the intake manifolds check the blind plug. They will crack on the ends.

I had check for intake leak and found nothing and have a new blind plug on it...

Idle is the worts part... when I give it some gaz it seem to pushing air, but the time I let the throttle go, it's sucking...

If I have a leak, maybe it's the intake itself... is it not suppose to run lean? And start popping ??

Can it be a bad valve seal?

thanks

 

[weekendrider]

Valve timing? The valves should be shut or not pushing air out anyway.