1,4,2,3?

  • lemo32
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1,4,2,3?

17 Mar 2006 16:00
#32041
if im sitting on the bike would no. 1 cylinder be far left, 4 next and 2 then 3. getting ready to set cams and the book says make sure 1 and 4 are top dead center but didnt say how they are numbered.
1979 kz 1000 06 katana 750

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  • Duck
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Re: 1, 2, 3, 4

17 Mar 2006 16:12
#32042
Front


1, 2, 3, 4


Rear


Right side up

Post edited by: Duck, at: 2006/03/17 19:12

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  • N0NB
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Re: 1,4,2,3?

17 Mar 2006 17:31
#32067
1 & 4 are the outside cylinders and 2 & 3 are the middle two. 1 is on the left side of the bike.

1 & 4 rise and fall together and 2 & 3 rise and fall together. When 1 is at TDC, 4 is also (unless the crankshaft is bent or twisted) while 2 & 3 are at BDC (180 degrees offset).

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  • rstnick
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Re: 1,4,2,3?

17 Mar 2006 17:45
#32070
What is the firing order?

1342?

Or are 1 and 4 at TDC on the compression stroke at the same time, and 2 and 3 ? In which case the firing order will be 1&4 at the same time then 2&3?
Rob
CANADA

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1978 KZ650 C2, 130K kms, Delkevic ex, EI, CVK32, PMC easy clutch, ATK fork brace, steering damper, braced swingarm, ZRX shocks, 18" Z1R front wheel.
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  • hydrolazer
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Re: 1,4,2,3?

17 Mar 2006 18:15
#32077
even though the pistons are both up at the same time, the valve timing is 180 degrees away from each other. if number one cylinder is on the compression stroke getting ready to fire the air/fuel mixture, number four cylinder is on the exhaust stroke. you will get spark to both plugs at the same time but the exhaust valve will be open and is pretty much a wasted spark but that is normal
\'79 kaw 1000 ltd

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  • The Milkman
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Re: 1,4,2,3?

17 Mar 2006 22:11
#32124
rstnick,,, I have always thought that the firing order for these was 1342 also, as any 4 cylinder I have ever worked on was. But I was corrected and had to check for myself.
If you look at the camshaft the order is 1243. Don't know why they did it that way, but they did.
Les
78 650-C2, Stock engine, Jardine 4-2 Exh., 17-38 sprockets, dyna ignition and coils, coil wiring mod, carb mod.

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Re: 1,4,2,3?

17 Mar 2006 23:38
#32130
with 2 seperate coils 1,4 fire at the same time at every revolution and the same for 2,3 if you switch the plugs between 1,4 or 2,3 it will still run
Terry Meyer / Wichita KS
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  • ltdrider
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Re: 1,4,2,3?

18 Mar 2006 10:25
#32213
Milkman's right.
1, 2, 4, 3 is the firing order.
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