Hello everyone I have a 94 cbr 900rr that I want to sync the carbs. I made a homemade carb sync tool and need to know where to connect the hoses. In the engine I have some vacuum lines that have been plugged and suspect that this is where I sync them. The lines come from the intake manifold right below the carbs on the back side of the engine(side closest to the seat) are these the lines? Or do they connect to the carbs? If any one can help please or post a pic. I have a petcock that has no vacuum hose

 

On the back side of the head where the carbs attach via the rubber boots(1 per carb, per cylinder) You'll see a small rubber plugged off hole on the underside of the intake ports. This is the point where you connect the lines. You'll need I think a 5mm threaded nipple to connect your sync gauge lines.

 

Ok thanks that's what I was talking about but I wasn't sure thanks again

 

The easiest way is to buy a mercury sync for about $50, Or find someone who has one. Or 4 vacuum gauges work, Where are you located? I am in NorCal and have a set if you are close
Jim

 

Where can I get a mercury sync for 50 bucks

 

Not sure what they cost nowadays, but I have a MotionPro merc. set.

 

Motion pro makes them, Try denniskirk.com or maybe motosport.com