Firing Order

[fj1289]

Looked it up today rather than going off of memory ... and I find two different posts where father Pat mentions 1-2-4-3....that just doesn't sound right to me...

Scratch my head - google 4 cylinder firing order and find 1-3-4-2.  I think that sounds more like it (what I've been using on the race bike in the setup files).  Then wonder why Pat is so hung up on the 1-2-4-3 order. 

Look at a Haynes manual and see the order they go thru for valve adjustment - what?  Go out and dig an intake cam out of a spares box — sure enough cylinder 2 follows cylinder 1. 

WTF - I've always used the 1-3-4-2 order on the racebike setup - but I guess it really doesn't matter with batch fuel and wasted spark!  Learning more again today!

Wonder why Yamaha went away from the "universal" 1-3-4-2 firing order?  I would guess it has to do with the center cam drive vice end cam drive on most 4 cylinder engines?

[FJ_Hooligan]

1243

Depends on the cam grind.  1 and 4 are paired and 2 and 3.  Doesn't matter whether 3 fires first or 2.

[Pat Conlon]

Wonder why Yamaha went away from the "universal" 1-3-4-2 firing order?  I would guess it has to do with the center cam drive vice end cam drive on most 4 cylinder engines?

Chris, I never gave it a second thought.
My previous bikes were the Honda CB500 and CB750 with the same wasted spark firing order as the FJ.

[racerrad8]

I wire my race cars 4213.

People look at the spark plug wires and tell us we have it wired wrong. I make us some cock & bull story or reworking the ignition system for better power delivery and performance.

We then go and beat them.

The best part of racing is getting into the other guys head...

Kind of like a clown car mechanic setting up a real race car

Randy - RPM

[ZOA NOM]

A real race CAR doesn't have a motorcycle motor. Duh.   

[racerrad8]

A real race CAR doesn't have a motorcycle motor. Duh.  

What's the difference?

Both air & oil cooled...

The Japanese design is in inline like performance engines should be.  The German version is designed opposed after tractor engines...

Randy  - RPM

[big r]

 

[ZOA NOM]

A real race CAR doesn't have a motorcycle motor. Duh.   

What's the difference?

Both air & oil cooled...

The Japanese design is in inline like performance engines should be.  The German version is designed opposed after tractor engines...

Randy  - RPM

Yeah, yeah, how many CAR racing championships Yamaha vs Porsche?

[racerrad8]

Yeah, yeah, how many CAR racing championships Yamaha vs Porsche?

Well,  I know there have been many Yamaha powered cars over the last twenty years just from RPM.

Let's switch it around...

How many MOTORCYCLE championships porshe Vs Yamaha?

Unfortunately,  I don't think porshe has the ability to cross over.  

Randy - RPM

[FJ_Hooligan]

The Ford SHO motor dominated racing in Japan.  It was a Yamaha engine

[ZOA NOM]

Yeah, yeah, how many CAR racing championships Yamaha vs Porsche?

Well,  I know there have been many Yamaha powered cars over the last twenty years just from RPM.

Let's switch it around...

How many MOTORCYCLE championships porshe Vs Yamaha?

Unfortunately,  I don't think porshe has the ability to cross over. 

Randy - RPM

Whatever. *eyeroll*

[Millietant]

In Rick's defence, isn't a flat six really a Helicopter engine  .......(as in a Robbie R44).

Mind you, most rotary people will tell you that the flat sixes and fours that power Helicopters are just glorified tractor engines anyway (with their 2,700 rpm red lines ).

[racerrad8]

The Ford SHO motor dominated racing in Japan.  It was a Yamaha engine

This looks like the one: https://www.rideapart.com/articles/264846/that-time-yamaha-built-ford-an-engine-and-changed-the-world/

Randy - RPM

[bigbore2]

so the smoothest AND most power producing order is 4213?

[Pat Conlon]

You rascal Randy...see how this starts?