84 'Ceptor FUEL INJECTED in the Works

For a 500cc bike you would use much smaller carbs.

 

I did NOT chose the cylinders for manifold sharing at random. I looked at many other engines and the firing order was part of that equation.
I chose the VW bug engine for my example since it has the same firing order and cylinder layout. 1-4-3-2 and we know that works. Many VW bugs use two -two barrel carbs. One on each side of the engine. sharing the manifold for cylinders 4 and 3 and 1 and 2.
Only the HONDA VF1100 has a different firing order (1-2-3-4)

 

i just have to comment on that statement about non vacuum carbs stumbling.

When set up right they do not stumble. Many races have been won with "conventional" carbs. They do not stumble. trust me. Do you think Mert Lawill would accept a bike that stumbles on accelerating?

 

Interesting stuff! The 1-4-3-2 order makes sense but on the Kawi image above it looks like the carbs are feeding the 1-2 and 3-4 cylinders not 1-3 & 2-4 as Honda has set up...am I missing something?

 

Got it, thanks!

 

One would like to think so. In reality vac carbs work good for street use for low to mid rpms and small throttle openings are were they shine. For any kind of fast rpms/power they are slow. So they are not really optimum. Racing carbs don't use them. Once your motor starts to get in to it's power band it will/should accept wot. I've always had good results with mechanical carbs when properly setup. If anything, from idle to wot all at once might bring a small stumble at first opening. The fix is to come out of the hole with a little higher rpms. Both vac and mechanical can bog in the wrong rpm.

 

Mert Lawill has won 17 national championships on every kind of motorcycle. One mile dirt track to road racing. Google Mert Lawill.

He designed one of the first suspensions for bicycles. He is also a machinist.