ever seen a header like this?

[jed.only]

now granted, its a cb, but doesnt look too far off. i like the look, and thats all im in it for, honestly.


maybe ill buy one and hack it up. id like to do a custom 4-2 with this style header.

[spchips]

Could make a 4-2 more effective at scavenging, assuming that the stock pipe didn't have a crossover either. In a left - right arrangement, the "pops" are 180-540 degrees apart alternating.

In this arrangement, they would always be 360 degrees apart.

[80GS750]

wow thats actually really good thinking....

looks kind of cool

i wonder what it would sound like

[jed.only]

that bike is a 1969 CB750. ill do some digging and see if i can make it work with minimal effort. i just like the look, but im sure it would perform well.

[PAULYBOY]

Okay, Kinda Dumb Question

why not run 1&3 to one side and 2&4 to the other? Wouldn't tha balance out the exhaust much better?

[Steve]

why not run 1&3 to one side and 2&4 to the other? Wouldn't tha balance out the exhaust much better?

No better than the current arrangement of 1&2 to one side and 3&4 to the other. The firing order is 1 - 2 - 4 - 3, so you want to pair the cylinders that are evenly spaced in the order, therefore, 1&4 and 2&3.

Kawasaki did this on some of their bikes back in the late 70s and maybe early 80s. I think they carried the CSR designation.

.

[TheCafeKid]

No better than the current arrangement of 1&2 to one side and 3&4 to the other. The firing order is 1 - 2 - 4 - 3, so you want to pair the cylinders that are evenly spaced in the order, therefore, 1&4 and 2&3.

Kawasaki did this on some of their bikes back in the late 70s and maybe early 80s. I think they carried the CSR designation.

.

I thought the CSRs were all twins?

[highmileage]

I thought the firing order was 1-3-4-2. Maybe it's my truck that I'm thinking of? Either way...

I've seen headers like those many times before. Don't know where to look for them these days except for fleabay...

[jed.only]

I thought the firing order was 1-3-4-2. Maybe it's my truck that I'm thinking of? Either way...

I've seen headers like those many times before. Don't know where to look for them these days except for fleabay...

for a GS suzuki?

[Steve]

I thought the firing order was 1-3-4-2. ...

Most in-line four-cylinder engines are 1-3-4-2. For some reason known only to them, Suzuki changed that to 1-2-4-3. The same cylinders are paired in the firing order, though, it's just a matter of whether #2 or #3 fires 'first'.

.

[makenzie71]

The CB750 firing order is 1-2-4-3 as well. Seperating the headers like that is just for the sake of sound...it'll have a slight "big-twin" note, but it'll be distinguishable by any experienced tinkerer. Your average biker though would think it sounds like every other harley, though.

The firing order is 1-2-4-3 because that's the most logical arrangement. You want think 1-2-3-4 but you can't fire the engine like that...the engine would rock it's self out of the frame in nothing flat. The thought pattern went just like that...let's fire cylinder one, good. cylinder two? good. Three? ****, that didn't work. Let's swap the last two.

The 1-3-4-2 firing order is the same firing order.

[Joe Nardy]

No better than the current arrangement of 1&2 to one side and 3&4 to the other. The firing order is 1 - 2 - 4 - 3, so you want to pair the cylinders that are evenly spaced in the order, therefore, 1&4 and 2&3.

Kawasaki did this on some of their bikes back in the late 70s and maybe early 80s. I think they carried the CSR designation.

.

I thought the CSRs were all twins?

I think the crossover headers were used on the 'SR' models, which I think were 650s only. Google searches for KZ750SR and KZ1000SR got no hits but KZ650SR got a bunch. I had friends with the standard KZ650 and the KZ650SR. The SR had the crossover headers. The CSR models were low-end models with spoked wheels and single disc brakes and came in several displacements, the smallest of which was a 305cc twin. I believe the rest were inline fours.

Thanks,
Joe