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ZX-10 Carbs work well on the FJ?

Started by craigo, January 27, 2011, 06:40:31 PM

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craigo

Hey all,

I was told by a mechanic at Poway Bikes, known for their work on FJ's, that the Kawasaki ZX10 carbs will increase power on our FJs.  Anyone know anything about that?  Is this a viable bolt on upgrade to increase power on our bikes?

Inquiring minds want to know,

CraigO
90FJ1200
CraigO
90FJ1200

Pat Conlon

Craig, there was a web site I recall, where you could get the spacing of the carbs based on the bike's make and model.  I can't find it.
So, a couple of questions
1) Is the carb spacing the same?
2) What mm diameter are the ZX-10 carbs?
3) Did the ZX-10 have a fuel pump?
4) ZX-10 have choke linkage?
5) ZX-10 have center pull (between 2&3) for the push/pull throttle cables?

If the ZX10 carbs work out, it's got be a lot cheaper than a $1250 rack of Keihin FCR39's 
http://www.motorcyclecarbs.com/Keihin_FCR_Horizontal_-_Yamaha_C627.cfm
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

craigo

Pat,

Here is the link to Poway Bike.  This is of a FJ1200 that they modified for a customer.

http://www.powaymotorcycle.com/gallery/yamaha/YamahaFJ1314.html

In one of the pics they show the ZX1000 carbs mounted to the FJ's intakes.  No mention of any mods done to accommodate them.  Here is the quote: "We used ZX1000 Kawasaki 36 mm Flat Slide Side Draft carburetors for the fuel delivery."

When the time comes to pull the trigger on my FJ's motor, I think I will have them do the engine work.

Cheers,

CraigO
90FJ1200
CraigO
90FJ1200

billwest

And no heat shield on the carbs, by the looks of it.

I have the same oil cooler, but his is upside down, compared to mine.


Bill.

Sold it!

racerrad8

Quote from: billwest on January 28, 2011, 07:19:35 PM
I have the same oil cooler, but his is upside down, compared to mine.
Bill.

I noticed that as well; pretty hard to drain the dirty oil that way...

Randy - RPM
Randy - RPM

JMR

Quote from: Pat Conlon on January 28, 2011, 03:25:43 AM
Craig, there was a web site I recall, where you could get the spacing of the carbs based on the bike's make and model.  I can't find it.
So, a couple of questions
1) Is the carb spacing the same?
2) What mm diameter are the ZX-10 carbs?
3) Did the ZX-10 have a fuel pump?
4) ZX-10 have choke linkage?
5) ZX-10 have center pull (between 2&3) for the push/pull throttle cables?

If the ZX10 carbs work out, it's got be a lot cheaper than a $1250 rack of Keihin FCR39's 

http://www.motorcyclecarbs.com/Keihin_FCR_Horizontal_-_Yamaha_C627.cfm
The 39's work very well if you modify the throttle cable mount and use Motion Pro cables. I have used them for years. The Mikuni 40 or 36 RS's work very well if you take some throttle spring out of them (not hard to do). They are very easy to tune too.

craigo

QuoteThe 39's work very well if you modify the throttle cable mount and use Motion Pro cables. I have used them for years. The Mikuni 40 or 36 RS's work very well if you take some throttle spring out of them (not hard to do). They are very easy to tune too.

Wow, a voice out of the blue.  Hi there, I don't think we have been properly introduced.   :hi:

What year FJ do you have and how long have you been using the Kawi carbs?  What performance improvements did you get?

CraigO
90FJ1200
CraigO
90FJ1200

Pat Conlon

Craig, I think he means the Keihin FCR39s, described here: http://www.fjmods.btinternet.co.uk/Carburation.htm
Kookaloo Frank and Steve C. have these carbs on their big block 1349 motors and, other than having no choke, they work well.

Cheers!  Pat
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

JMR

Quote from: craigo on January 29, 2011, 09:25:26 PM
QuoteThe 39's work very well if you modify the throttle cable mount and use Motion Pro cables. I have used them for years. The Mikuni 40 or 36 RS's work very well if you take some throttle spring out of them (not hard to do). They are very easy to tune too.

Wow, a voice out of the blue.  Hi there, I don't think we have been properly introduced.   :hi:

What year FJ do you have and how long have you been using the Kawi carbs?  What performance improvements did you get?

CraigO
90FJ1200
Hey Craig. My name is Mike Rieck and one of my bikes is an 87 FJ that I bought new. It's on it's 4th, normally aspirated engine configuration. I've been lurking on this sight for a bit and finally decided to get involved. The fella's on the board seem like a nice bunch of guys who really love the FJ. I know I do. I owned a small shop in Massachusetts in the 90's and currently focus on cylinder head porting (jmrporting.com) engine building. I also manufacture a billet cylinder for SOHC CB750's (my first love) that is Nikasil lined and allows for proper 1000cc displacement. The bulk of my porting business is vintage SOHC Honda's whether for street, roadracing or land speed. I also really enjoy porting FJ heads as there is a lot of room for improvement. :yes:

Flying Scotsman

Got any pics of your porting on a FJ ?.
What porting do you reccomend for the street (93 octane) and what comp pistons do you run with the same set up.I have a ported GP 1200 (waverunner) and a non ported GP1200.I love the ported one
it makes  about 165-170 hp or so.After I turn the FJ1100 into a FJ1200 porting sounds like a good option.What would porting cost on a FJ ?.
1984 FJ1100
1985 FJ1100
1990 FJ1200
1999 GP1200 (165 + hp)

Pat Conlon

Quote from: Pat Conlon on January 28, 2011, 03:25:43 AM
Craig, there was a web site I recall, where you could get the spacing of the carbs based on the bike's make and model.  I can't find it.

I found the site, the info. was buried in the Mikuni RS application table
http://www.motorcyclecarbs.com/Mikuni_RS_Application_Informat_W93C1430.cfm

Yeppers, the Kawasaki 1986-1987 Ninja ZX1000 has the same carb spacing 77-85-77 as our FJ's.
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

fj1250

Been running  a set of Ninja 1000 carbs for 10+ years.
They may make a little more power, but definitely have a stronger low end. This is mostly due to have a quicker turn throttle cam.
I also get better fuel milage with these, averaging 40+ mpg with a 1250cc engine.

You will have to slot the mounting rack aprox 1/8" and make up throttle cables that have shorter inner cables.
I also cut notches out of the heat shield so I can still run it.
They are quite a bit shorter in length. To run a stock air box I pulled the boots out about 3/8" and glued them in place.
Otherwise a jet kit and pod filters are required.

MC

craigo

Pat,

Thanks for digging that up for me.  I am not happy with the low and mid on my bike.  I figure it has to do with the carbs.  They were never really right since I bought her.  The air screws were tampered with and they may have been screwed down to tight at one time in their life.

So, if the ZX carbs are a straight bolt on, I may just go with a set of those instead of trying to fix these.

Cheers,

CraigO
90FJ1200
CraigO
90FJ1200

SlowOldGuy

First gen FZ1 carbs should also work on the FJ.  They're just a newer version of our Mikuni carb.

DavidR.

simi_ed

-- RKBA Regards,

Ed
===
Ed Thiele 
Simi Valley, CA -- I no longer have SoCal manners.
'89 FJ12C (Theft deterrent Silver/White)


- All that is necessary for the forces of evil to win in the world is for
enough good men to do nothing.

- Edmund Burke