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Messages - RainCityRider

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CB750 / Re: How do I know were to put the different rocker arms????
« on: September 17, 2009, 03:05:20 AM »
"ok, so this is a simple question for any one that has taken the head off the top of the engine........the two outside pistons move at the same time with each other.....the two inside pistons move at the same time opposite the outside......."now"........if you look at your points plate you will see that the points fire at the same time for 1and 4 and opposite for 2 and 3....so you would think the firing order was 1-4 and then 2-3...back and forth like that......."but"........"nope"......... if you really dig deep, take out your plugs to watch the rise and fall of the pistons....remove the valve cover to watch the movement of the valves.....you will see that the firing order is not...."why" because if you watch your point as the engine is turned over slow you will see that the spark plugs fire during the "compression and exhaust" phase........."Why"...........because its just easier in the design of the engine, you have 4 cylinders and only two sets of point!

The Winner is.................................................................Houndog 1 2 4 3

To be honest........I never really thougt about it, just not a big deal......get a cb750 shop manual and you will be fine and yes...your coils are working twice as hard"

found on: http://www.hondachopper.yuku.com/topic/7651

Is the 750sergant right is the firing order 1234? Does that mean both 1&4 fire but only say 1 has gas in it?

Or is it 1-2-4-3 as found here, http://www.salocal.com/sohc/tech/fire4-lcnt.gif

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CB750 / How do I know were to put the different rocker arms????
« on: September 17, 2009, 02:53:15 AM »
I am rebuilding my 78 CB750 and didn't mark the rocker arms when I took them out. So it seems like they aren't hitting right on the cam shaft.

Is the an order for the A & B rocker arms?

There are different numbers on some of them:
3 X A 61
1 X A 82
2 X B 36
1 X B 37
1 X B 68

 ???

I'm lost?

Also what is the firing order for the engine? Do 1&4 and 2&3 fire at the same time?

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