Firing Order HELP!!! - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
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post #1 of 12 (permalink) Old 03-11-2012, 12:08 AM Thread Starter
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Firing Order HELP!!!

I have my bike completely taken apart and I can't figure out if one cylinder fires, then the other fires almost immediately after.. that it like 45 degrees or whatever, or if one cylinder fires then 315 degrees or whatever after the other fires? I can't figure this out and the manual isn't very clear. I am trying to get the cams adjusted correctly and need to know this.
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post #2 of 12 (permalink) Old 03-11-2012, 01:48 AM
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The manual, either Clymer or Kawasaki, explains how to install the cams. Follow their instructions to the letter.

I am a motorcyclist, NOT a biker.


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post #3 of 12 (permalink) Old 03-11-2012, 10:09 AM
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I stongly suggest you review Roach's video files on engine rebuild.

https://www.vn750.com/forum/showthread.php?t=18289

Part 23 would be good.

~~C8> Ratt
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post #4 of 12 (permalink) Old 03-11-2012, 03:04 PM Thread Starter
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Another Question... Do the spark plugs fire every revolution or every cycle?
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post #5 of 12 (permalink) Old 03-11-2012, 03:22 PM
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The ignition pick-up coils, (or pulse coils I believe Ma Kaw calls them), get a signal on every revolution of the crankshaft from the magnet in the alternator rotor. So there is a waste spark in the exhaust stroke too.

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post #6 of 12 (permalink) Old 03-11-2012, 03:24 PM
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They give off a spark every time that the piston hits the top. And they do fire one right after the other.

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post #7 of 12 (permalink) Old 03-11-2012, 03:25 PM
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It's a 4 stroke.. Each jug once every 4 turns of the crank. Being a twin you you get one firing for each 2 turns.
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post #8 of 12 (permalink) Old 03-11-2012, 03:30 PM
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The plugs spark every time that the piston hits the top;however, you only get a power stroke every other time.

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post #9 of 12 (permalink) Old 03-11-2012, 08:21 PM
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Quote:
Originally Posted by niterider View Post
The plugs spark every time that the piston hits the top;however, you only get a power stroke every other time.
There I go thinking again. You are correct in that it will fire off on the exhaust stroke. My bad....
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post #10 of 12 (permalink) Old 03-11-2012, 08:29 PM
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That is where the big back fire comes from when the battery is low. The fuel builds up and the spark is to weak to ignite on the power stroke, but it will ignite the feul on the exhaust stroke. So bang, out the exhaust valves.

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