right cylinder wont fire,

My right cylinder won't fire,ive replaced old crabs with Mikuni vm 30s,new ignition coil.The motor has Benn completely rebuilt.... any advice is much needed

Depends on whether this is on a BMW boxer or a BSA Victor. One uses metric crabs, the other uses Whitworth crabs

This motor has been rebuilt, new carbs, ignition coil, wiring harness,etc...and now the aright cylinder isn't firing...... any help much needed

Including information about bike year and model is helpful to viewers.

An easy way to do this is to create a signature, which shows in all posted messages, past and future, and which may changed whenever and as often as desired.

If wanting a signature showing information about the bike in posted messages, it's simple to do. Here's how:



Good Fortune!

44082,
If you are serious about wanting help, you need to provide some specific information about your motorcycle. For all we know, it may not even be a Kawasaki, much lees one of the KZ family. Even if we assume it is a KZ, that is not enough. The KZ family includes --
1, 2, 4, and 6 cylinder models
early models had mechanical carburetors, later ones used constant velocity carbs, and there are some with fuel injection
there are points ignitions and solid state ignitions
There are single phase and three phase charging systems
drum brakes, disc brakes and some with both
chain drive, shaft drive and belt drive
The list of factory differences goes on and on, and this does not even address they myriad of aftermarket equipment that may be fitted.

There are a bunch of helpful, knowledgeable members here, but to get useful help from them, you need to tell us exactly which model and year of motorcycle you are working on and provide any pertinent modifications that have been made to it.

Thought it was in my profile,I'm new to this... its a 82 kz440

Perhaps the member name 44082 is intended to suggest 1982 KZ440.
Am thinking various models of 1982 KZ440 all came with the same engine.

To the non-firing issue at hand --- Does the right side spark plug have fat blue sparks? This can be determined by removing the plug, attaching the lead, holding the plug base in contact with the engine, and spinning or kicking over the engine while viewing the business end of the plug.

If there's ample plug spark, the issue is likely with either compression (usually entails need to check and adjust valve clearances) or fuel mixture (entails all the various carb stuff).

Or maybe there's a nice mouse nest inside the muffler that's blocking the exhaust.

Is the stock air-box fitted along with a fresh filter?

Good Fortune!