Kawasaki ZX-7, 1989

True Rear Wheel HP Scale
as measured on the Low Inertia EC997 Eddy Current Dynamometer

part number


CRB-K07-1.0  $139.95

1. Choose your shipping method


STD drop-in carb recal kit

Best "drop-in" kit made for the "7"

Boosts power a bit at full throttle, improves throttle response and wheelie ability. Definitely pulls harder out of 2nd and 3rd gear corners.
Finely honed to perfection - the Low Inertia EC997 Eddy Current allows us to discern even the difference between individual cylinders. This kit is finely designed - the perfect needle set for all four cylinders. Good for additional midrange over any kit that uses the same needle in all cylinders!

Ever wonder why 89-90 zx7's run too rich at low rpm? Factory Pro can help dial our kits in for perfect running -

CRB-K07-3.0  $139.95
(plus filters)

1. Choose your shipping method



For when you want to remove the airbox and run individual air filters -



SHFT-KAW-6   $49.95

1. Choose your shipping method


F-Pro Shift spring

Make shifting MUCH quicker and virtually eliminate missed shifts when it's done.


RTR-KAW-7   $109.95
Replaces 21007-1190/1195

Ignition Advancer

1. Choose your shipping method



Ignition Advance Rotor

Easy bolt on.

 Adds some power at ALL part throttle positions. That equates to more "snap" in throttle response for you. MUST do for best performance.

1. Choose your shipping method


Float Height Gauge -

Virtually Universal

Set heights to the mm!

General Technical Support


How to adjust float heights and why would I want to do that?

17mm float height setting

To adjust float height

You read the carb kit instructions and they specify a 15mm float height. Float height? What's a float height?  15mm? How much is that in inches? (it's .590")

Does that mean I must do it?

What do I measure with?

You can use a set of vernier calipers, if you have them - they are great for measuring all sorts of things, but you can make it even easier with our

Float Level Setting Gauge

Measures from 0mm to more than you will ever need.    Easier to use than vernier calipers on carbs. The vertical legs adjust in width and the thin post slides up and down so you can slide the post to the required clearly marked float height measurement.


This is a sample carb. Float measurement and adj procedures are the same on virtually any carb that you'd likely run into.

Remove float bowl screws. Factory Pro gives you replacement allen screws in most carb kits to replace usual Phillips screws.

Slide the lower movable leg so that both legs will rest on what would be called the gasket surface of the carb body (if there was a gasket, anyway)


Tilt the carbs so that the floats just flop over towards and into the carb body.

Tilt just enough to touch and close the float the float valve, but...

Do NOT compress the float valve spring when measuring (only exception is 95-97 zx6r)

Test adjust the "L" horizontal arm in the usual 1mm increments and test fit the gauge to see what the float is set at now. (or not).

(If we say 15mm and you measure 4mm less than that - you might be compressing the little float valve spring.)

At this time, you can set the Float Height Gauge to what you want to reset the floats to.
If you are tuning, you'd usually use 1mm increments

CV Carbs: Too RICH at full throttle / low rpm (that's the most common in CV carbs)
Slide carbs (FCR's) - Float height controls 25% throttle at ALL rpms.

If the float height is too low (small float height measurement), bend the tab slightly to increase the height measurement. It's a 5:1 movement ratio.

CV: If the float sticks out further, down, into the float bowl, the carb will deliver less fuel (leaner), especially at low rpms and at cruise.
Slide carbs: Float height controls 25% throttle at all rpm's, even at redline.

You'd generally change the float height in 1mm increments when tuning.

It will affect the topend slightly. Maybe 1.5mm leaner float height would require 1 size larger main jet to keep equal main jet fuel delivery.

CV Carbs: Too LEAN at full throttle / low rpm (not too common in CV carbs)
Slide carbs (FCR's) - Float height controls 25% throttle at ALL rpms.

If the float height is too LARGE, bend the tab slightly OUT to decrease the height measurement.

If the float sticks out further, UP, into the carb body, the carb will deliver MORE fuel (richer), especially at CV low rpms and at cruise.

It will affect the topend slightly. Maybe 1.5mm richer float height would require 1 size smaller main jet to keep equal main jet fuel delivery.

You'd generally change the float height in 1mm increments when tuning.

When you are done, a multi-cylinder must be all within .5mm (1/2mm) or .020" range of each other.


Nifty baffle plates in the 05 KLX300!
This carb type has been around since the early 80's.  It's had some updates over the years. It's similar to the Ninja 900'a and ex250 styles.
A view from the engine side, butterfly open.

Why adjust the float height?

Changing the float height changes the level of the fuel in the float bowl. The fuel height adjusts the full throttle, 2k-3k rpm and part throttle cruise, as in cruising around town, trying to be quiet... To give a scale of change, if the bike runs well when cold, but gets a bit sloppy when fully warmed up, lower the fuel level 1mm (i.e. go from 15mm to 16mm float height - remember the float measurement is "backwards").

When do I adjust the float height?

When installing a Carb Recalibration Kit tm.
When rebuilding carbs.
To adjust low rpm / part throttle operation that isn't pilot jet, fuel screw or needle height related.
When a bike starts running rich at  low rpm after a mishap or
After an overwhelming gravity equalization process occurs.

How much is the nifty Float Valve Measuring Tool? How much is that nifty Float Valve Measuring Tool?

About $59.95, direct from Factory Pro

415 883-5620

415 492-8803 fax


carb,float adj,38Mik.jpg (197016 bytes)
(for larger view, use your browser "view image".


This is a picture of a set of 38mm Mikuni CV carbs as supplied on the:

Ducati 600/750/900
Yamaha YZF750, fzr1000
Yamaha TDM/TRX 850

showing the Float Height Tool in use.

Note: Doing 38mm Mikuni downdrafts?
 Get the nifty float cage holder to make your life easy!
Click here


Measure the "rectangular", taller float (not the lower, "diamond / parallelogram" shaped one) There is ~3mm difference between the 2 different floats!
Remember to measure the float height - tilt the carbs till the floats just barely flop over and close the float valve, but don't compress the float valve spring!


Clock widget          




The below links are people and companies that are consistently impressive with their continual uniqueness and dedication to providing traditionally valued, quality products and services.

Flight Training - train with AMA race winner Todd Harrington.

The Harringtons own American Flyers, one of the most established flight training facilities in the USA - 8 locations -

Train to Win
The Rich Oliver Mystery School will help you discover your hidden inner strength. 
It will challenge you. It will teach you a new way of thinking and a new way of riding. You can take your riding to an exciting new level!  

We use a variety of proven drills and training techniques. 
Practicing these techniques with our Yamaha dirt track trainers will enhance your abilities both on the track or the street.  

It doesn't matter what you ride or race, the Rich Oliver Mystery School improves everyone's skill level and mindset!

WW2 vintage flying Special

Book a sightseeing flight over the Wine Country or a Kamikaze aerobatic flight or a biplane flight over famous Sonoma Raceway, the Golden Gate Bridge and the San Francisco Bay for one or two during the spring and get a free souvenir t shirt!
NEW!  Ask about the P-40 and P-51 flights!

707 938 2444

Just tell them that you saw this on the Factory Pro website!
Northern California's most unforgettable flying experience.  No experience required.  Open weekends! Call ahead in the winter.

Make your next tour Unforgettable,  Affordable and Exotic.
Superbike Tours Thailand - See you there.

Supwebike Tours Thailand
The extension of the laboratory for engines of the Swiss Federal Institute of Technology was completed in about 1935. Its architect was Rudolf Otto Salvisberg (1882-1940). He had a successful career in Berlin but returned to Switzerland after the advent of the Nazis. His architectural style was somewhat similar to that of Erich Mendelsohn. The staircase of the laboratory is in normal use but well preserved.
Edited to the tunes of Chemical Residue by Herbie Hancock.

Artisan Crafted Fine Cheeses – Since 1865   -    Specializing in Handmade Brie & Camembert

Marin French Cheese Co., also known as The Cheese Factory and Rouge et Noir is not just the oldest cheese manufacturer in the country, but a vacationers and day trippers destination as well as a unique part of American History. Located north of San Francisco, east of Napa County, west of Pt. Reyes and Olema and south of Sonoma County, Marin French has produced hand crafted Artisan soft ripened cheese since 1865. Rouge et Noir cheeses are similar to French and European varieties but reflect the characteristics of Northern California, producing it's own regional style.