Firing order

Have been trying to find the above for my bike (see below) can`t find in Haynes, looking at my semi dismantled spare engine it looks like 1/4 fire together and 2/3 fire together.So if thats the way it fires do ya reckon a 4 into 2 exhaust plumbed the same way, would make it sound similar to a twin
cylinder?
Edit: as it now says above, not "1/4 together and 3/4 together" my mistake!

 

So on looking through the forums related to this topic I have found; TIMEtoRIDE says that for a 750 the order is 1 3 4 2 and bosuzoko says that for a550 the order is 1/4 together and 2/3 together, surely it`s one or the other?

 

You rang?

It's both. the 1/4 coil fires on 1. 4 is a "miss" Then the 2/3 coil fires #3. 2 also fires a miss (on the exhaust stroke) Then 4, then 2.

If you ran the 2/3 pipe out the left you'd have to cross the #1 pipe over those 2 without it looking like a backyard job. Neatness counts.
Yes it would sound different than the collector box set-up or a 4 into 1.

But the easier and louder way is to run 1 + 2 out the left and 3 + 4 out the right with no crossover tube.

 

Thanks TIMEtoRIDE its becoming clearer, i get the part about the coils firing every revolution, have seen it called the wasted spark method, its the actual order of combustion that interests me ie, firing order, without the confusion of the wasted spark.

 

Speaking of which.......whatever happened to Bosuzoko....kinda miss that fella.......he had a great avatar.

 

Remember, you are saying FIRING order. So Time is correct, 1/4 and 2/3.

The exhaust idea like I said in the other thread won't do much, because of the fact that only ONE cylinder fires at a time. No matter the combo, it's going to sound basically the same.

The reason for the crankshaft design is that it's more even power.
There are BMW opposing twins out there that the crankshaft makes both cylinders at TDC at the same time. This is because the push left and right in relation to the bike, instead of up and down. If they were one @ TDC and one at BDC, the bike would PUSH itself left and right as the inertia moved over.

I don't think it's possible at all to get an XJ bike to sound like a Vtwin, because, well, it's not a twin. If the center two fired at the same time, and then the outside two, that's a different story. But they don't.
Much more even power with the design we have anyway.
Forget the popcorn sound, it's overrated. Get your bike over 6K and have fun with it

 

So its 1 goes bang 3 goes bang 4 goes bang 2 goes bang then repeat often, and chacal "speaking of which...." confusion you mean? Thanks for comments all.

 

If you had the money to waste on a custom ground cam you could get 1/4 to fire together ( and 2/3) and you wouldn't even need to change the ignition.
All inline 4 CYL engines have the center 2 pistons rise and the outer 2 fall- - it's the smoothest design. There's still a slight vibration that a few car co's made a counter balancer shaft to get rid of the buzz.
Some 2 CYL bikes have one piston up, one down (Honda Rebel) and have a "hit hit miss miss" firing order. My old XS 500 had both rise and fall together and had a counter balancer. It was really smooth.

 

Thanks, i get it now........Can`t wait to save up for the special cam, that will make mine unique. No need to hardtail it.