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Author: Subject: Firing Order
Darryl752
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[*] posted on 25-2-2005 at 04:09
Firing Order



OK, I will finally swallow my pride and ask this question. I had my coils off for valve cover polishing/seal replacement. Must have had a couple beers because I cannot remember if #1 plug wire is on the left/shifter side or the right/brake peddle side.
Thank-you,
Darryl (red faced)




1978 KZ 650 C
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N0NB
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[*] posted on 25-2-2005 at 04:21


1 and 4 fire from the left coil and 2 and 3 from the right coil. It pays to label things when taken apart. :D

- Nate >>




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Salvy
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[*] posted on 25-2-2005 at 04:21


Don't sweat it. There's no such thing as a dumb question!

On my 550, #1 is on the left side. I'm sure some 650ers will chime in to confirm.




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jarhead
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[*] posted on 25-2-2005 at 05:42


From left to right as you are sitting on the bike:1,2,3,4.



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'77 KZ650B, '81 H engine, cafe project

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Corith
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[*] posted on 25-2-2005 at 06:12


The left (shifter side) should fire 1 and 4. Right (brake side) whould fire 2 and 3.

This gives you a fire order of (1 4), (2 3)

-- Craig




1978 KZ650B2.
Dyna S DS2-1 with Dyna DC1-1 Coils
HD Sportster 13" rear shocks, Oil Cooler, Red Rear Turn Signals, Kick-ass attitude
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wiredgeorge
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[*] posted on 25-2-2005 at 06:27


The safest way to determine where your plugs go is to look at the wires that feed the coils. There will be a dark green on one and a black on the other. The dark green feeds the 2&3 coil and the black the 1&4. The 2&3 coil will have plug wires that go to 2&3 cylinder/plug and the 1&4 coil to the 1&4 cylinders/plugs. As has been noted, the cylinders are counted left to right as you sit on the bike, 1,2,3,4. I bring this up because there is no reason that one coil has to be the 1&4 or 2&3... the coil can be mounted on either side and if someone in the past didn't know it was common to mount 1&4 on left, they might have connected the green and black wires backwards and still things work perfect.

[Edited on 25-2-2005 by wiredgeorge]




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scary harry
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[*] posted on 25-2-2005 at 11:41


RE: Firing order.

Sorry to disagree but the firing order is:

1-2-4-3 not (1 4), (2 3).

I realize that is the way the coils are set up but plugs do not fire in that order.

[Edited on 25-2-2005 by scary harry]




Harry Williams
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jarhead
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[*] posted on 25-2-2005 at 12:02


Scary Harry, how can it fire each separately when there are only two point and two condensors or two trigger coils on the plate? The only way would be to have each journal on the crank 90 degrees apart. If that's the case(which it isn't) the timing marks wouldn't be 1/4 and 2/3.



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'77 KZ650B, '81 H engine, cafe project

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ShovelFred
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[*] posted on 25-2-2005 at 12:25


Hi Boys
the stupid motherfucker swed
had to interfere
you're right 'bout the order of spark
we had the classic japanese waste spark
system 1-4 share coil and 2-3 share coil
if you had a system of 4 coils 1 for each cylinder it would be optimum i use 2 coils
for both my Harley and Ducati and i have
single fire but on inline 4s you have wastespark when #:1 fire, #:4 exhaust
and so on #:4 fire, #:1 exhaust and likewise with, #:2, #:3 conclusion you waste a spark for nothing = wastesparksystem yeah that's true
but it's working and still is to this day with
the new japcrapers, ride on,ride hard,ride safe

SeeYa

[Edited on 25-2-05 by ShovelFred]




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scary harry
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[*] posted on 25-2-2005 at 12:37


It is true that each coil fires two plugs. However, one plug is fired on the power stroke and the other is fired on the exhust stroke.
Only one cylinder is on a power stroke at one time.

scary harry has attached this image:
img-1109363876.jpg - 0.00 B




Harry Williams
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ShovelFred
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[*] posted on 25-2-2005 at 18:02


Sir Harry!
Thanks for the pic
it's a bit strange that the japper fiddlin'
with the firing order they have 1,4,3,2
or 1,3,4,2 and kawi 1,2,4,3

fyi euro cars with inline4s have 1,4,3,2




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[*] posted on 25-2-2005 at 18:25


Well, I was wrong in my thinking, but technically I was right. The firing order is (1 4), (2 3), it's just that it is more like:

(1 4), (2 3), (4 1), (3 2)

Where the second chamber is on the exhaust stroke.

But that is interesting. I had assumed that each piston went down at the same time (1 and 4 together, than 2 and 3). But I guess they don't? Wait, so now I'm really confused. What does this look like?

Are 1 and 4 at TDC at the same time? or are they 180 degrees off? What about 2 and 3?

-- Craig




1978 KZ650B2.
Dyna S DS2-1 with Dyna DC1-1 Coils
HD Sportster 13" rear shocks, Oil Cooler, Red Rear Turn Signals, Kick-ass attitude
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ShovelFred
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[*] posted on 25-2-2005 at 19:19


Here you have a Kawasaki crank from Falicon
from left to right #4,#3,#2,#1
1-4 tdc at the same time
2-3 tdc at the same time

ShovelFred has attached this image:
img-1109387948.jpg - 0.00 B




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KZJohn
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[*] posted on 25-2-2005 at 19:40


When # 1 is on TDC compression #4 is on TDC exhaust, and vise-versa. When a coil fires, one of the plugs is on compression,( if everything is timed properly!).



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Darryl752
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[*] posted on 26-2-2005 at 03:14


ok, so #1 wire goes on the shifter side, 50/50 chance and I get it wrong.Swap them around today I guess., probably after I pull the insrument cluster out of my wife's '02 Jimmy to check why the tach is noisy. lol, just wait untill I ask you guys how to hook the wires back up to that. Thank-you for all the input.
Darryl




1978 KZ 650 C
Rigid Shovel WG
1976 17.5 foot Campion SBC 305
2001 Silverado SWB 4X4 Black
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[*] posted on 26-2-2005 at 08:36


[quote][i]Originally posted by Salvy[/i]
Don't sweat it. There's no such thing as a dumb question!...[/quote]

"Can I get taste loss from a foosball table?"
"Ok that was a dumb question"




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