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Firing Order

Started by fj1289, April 22, 2019, 08:25:34 PM

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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.
DavidR.

Pat Conlon

Quote from: fj1289 on April 22, 2019, 08:25:34 PM
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.
1) Free Owners Manual download: https://tinyurl.com/fmsz7hk9
2) Don't store your FJ with E10 fuel https://tinyurl.com/3cjrfct5
3) Replace your old stock rubber brake lines.
4) Important items for the '84-87 FJ's:
Safety wire: https://tinyurl.com/99zp8ufh
Fuel line: https://tinyurl.com/bdff9bf3

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 :bomb:

Randy - RPM
Randy - RPM

ZOA NOM

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

Current:
2010 Honda VFR1200 DCT (Full Auto!)
1993 FJ/GSXR 1200 (-ABS)
1987 Porsche 911 Carrera (Race)
1988 Porsche Carrera (Street)
Previous:
1993 FJ1200 (FIREBALL)
1993 FJ1200ABS (RIP my collar bone)
1986 FZ750
1984 FJ600
1982 Seca

racerrad8

Quote from: ZOA NOM on April 23, 2019, 01:49:30 PM
A real race CAR doesn't have a motorcycle motor. Duh.   :bomb:

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
Randy - RPM

big r


ZOA NOM

Quote from: racerrad8 on April 23, 2019, 01:53:33 PM
Quote from: ZOA NOM on April 23, 2019, 01:49:30 PM
A real race CAR doesn't have a motorcycle motor. Duh.   :bomb:

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?
Rick

Current:
2010 Honda VFR1200 DCT (Full Auto!)
1993 FJ/GSXR 1200 (-ABS)
1987 Porsche 911 Carrera (Race)
1988 Porsche Carrera (Street)
Previous:
1993 FJ1200 (FIREBALL)
1993 FJ1200ABS (RIP my collar bone)
1986 FZ750
1984 FJ600
1982 Seca

racerrad8

Quote from: ZOA NOM on April 23, 2019, 09:42:34 PM
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.  :shok:

Randy - RPM
Randy - RPM

FJ_Hooligan

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

ZOA NOM

Quote from: racerrad8 on April 23, 2019, 10:32:10 PM
Quote from: ZOA NOM on April 23, 2019, 09:42:34 PM
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.  :shok:

Randy - RPM

Whatever. *eyeroll*
Rick

Current:
2010 Honda VFR1200 DCT (Full Auto!)
1993 FJ/GSXR 1200 (-ABS)
1987 Porsche 911 Carrera (Race)
1988 Porsche Carrera (Street)
Previous:
1993 FJ1200 (FIREBALL)
1993 FJ1200ABS (RIP my collar bone)
1986 FZ750
1984 FJ600
1982 Seca

Millietant

In Rick's defence, isn't a flat six really a Helicopter engine  :good2:.......(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 :sarcastic:).
Dean

'89 FJ 1200 3CV - owned from new.
'89 FJ 1200 3CV - no engine, tank, seat....parts bike for the future.
'88 FJ 1200 3CV - complete runner 2024 resto project
'88 FJ 1200 3CV - became a race bike, no longer with us.
'86 FJ 1200 1TX - sold to my boss to finance the '89 3CV I still own.

racerrad8

Randy - RPM

bigbore2

so the smoothest AND most power producing order is 4213?


Pat Conlon

You rascal Randy...see how this starts?

1) Free Owners Manual download: https://tinyurl.com/fmsz7hk9
2) Don't store your FJ with E10 fuel https://tinyurl.com/3cjrfct5
3) Replace your old stock rubber brake lines.
4) Important items for the '84-87 FJ's:
Safety wire: https://tinyurl.com/99zp8ufh
Fuel line: https://tinyurl.com/bdff9bf3