Topic: 1980 Honda CB 750 DOHC Firing Order???

[ElCheapo]

Ok I got this bike in and cleaned the carbs and I guess I never verified that customer installed the replacement coils correctly. When it came to me it was running on 2 cylinders. Because of the coils failing (cracked), it looks like the ignitors were seriously overheated to the point that the black sealant melted out the back and made a mess. All I can verify is that I have spark on two cylinders. I know one of the ignitors is dead as when I swap them I have spark in the opposite coil and not in the other. But none the less...

I NEED A FIRING ORDER -- HELP

[GroovieGhoulie]

I thought these puppies fired 1-2-4-3.  I know that the most common firing order for 4-cylinder engines in cars is 1-3-4-2, why Honda went the other way on that one, I dunno.

[ElCheapo]

I thought these puppies fired 1-2-4-3.  I know that the most common firing order for 4-cylinder engines in cars is 1-3-4-2, why Honda went the other way on that one, I dunno.

What I am looking for in order is left coil is whatever cylinders and right is whatever

[crazypj]

 coil  (1-2) goes to cylinders 2-3. Coil 3-4 goes to cylinders 1-4, Two of the leads should be almost the same length and the other coil should have one long and one short lead, Short is no. one cyl. ( I'll check when I find the book.)
PJ

[ofreen]

Here's a link to the Honda manual -

http://cb1100f.net/modules.php?name=Forums&file=viewtopic&t=955

Here's a link to the specifications, has electrical and ignition info among other things -

http://www.cb1100f.net/Other/CB750FManual/Honda%201979%20thru%2083%20CB750%20Service%20Manual%20Chapter%2001%20General%20Information.pdf

[ElCheapo]

Here's a link to the Honda manual -

http://cb1100f.net/modules.php?name=Forums&file=viewtopic&t=955

Here's a link to the specifications, has electrical and ignition info among other things -

http://www.cb1100f.net/Other/CB750FManual/Honda%201979%20thru%2083%20CB750%20Service%20Manual%20Chapter%2001%20General%20Information.pdf

This was of great help. Thanks for the help guys. With any luck and a different set of ignitors it will be running by monday morning.