xl75 77-79
xr75 77-78

xl80 80-85
xr80 79-03
crf80f 04-12+

xl100 79-85
xr100 81-03
crf100f 04-13

"Long Boy" extended fuel screw for CRF100f only

(sample pic above)

CRF100f  only  Long Boy Fuel Screw Kit

pn: CRZ-SCR-3518k2

 $23.95 screw kit
 with new screw, spring, washer and o-ring

replaces: 16016-KPT-A61,1606-KPT-A21, 16016-KSJ-A01, 16016-KSJ-A81

1. Choose your shipping method



Finger Adj Extended Fuel Screw

Frustrated with trying to find an "almost 90 degree"  screwdriver to fine adjust your fuel screw for best idle and cruise?
Use Factory Pro's new "finger adjustable" fuel screw to adjust fuel screw for best throttle response. Traveling to high altitude? It's easy to lean out the lowend temporarily.

Make your life easier.

Remove old short stock fuel screws, old o-rings, old washers and old spring. The o-ring might be stuck in the carb, so, take a light and make sure it's really out if it didn't come out with the screw (or you can't find it after you took out the screw)
Use a small bent wire to pull it out if it doesn't drop out. Keep the old parts for "spares".

Factory Pro's Shift STAR kit -
help prevent missed shifts and dog and fork damage caused by missed shifts.
(sample pic only)

SHFT-ARM-H115  ARM only 
24430-115-010 STOPPER

(inc 1 Microbearing Detent Arm only, clutch cover gasket not supplied)

1. Choose your shipping method


(sample pic only)

pn:  z95-h149-059 SPRING
(replaces oem spring: 24436-149-000)

SPRING only  $39.95

(inc 1 F-Pro Shift Spring - clutch gasket not supplied)

1. Choose your shipping method


Upgrade your bike to "better than new" quicker, more consistent shift action with an F-Pro Microbearing Shift Detent arm and F-Pro Shift Spring.

Proven in 10+ years of pro level use.

Virtually eliminate missed shifts.

Decreases shift process duration 5ms to 10ms

Make shifting quicker and virtually eliminate missed shifts.

Helps address missed shifts caused by poor shift detent "star" profile.
Helps prevent shift fork and gear engagement dog damage caused by missed shifts.

The Factory Pro Shift STAR kit is an awesome upgrade for the notchy Honda shifting.

Installation: Slightly more complicated than replacing the clutch basket. It's right behind the clutch basket.

No case splitting required.


Shift Star kit worked awesome!  Not one missed shift all weekend.  Easier to find neutral, too - Which is good because I have to put it in neutral to start it for some reason. Doesn't like to start with the clutch in. With the close ratio tranny, I did a lot of shifting.

Leigh Thomas - Mojave area



Absolutely NO carb parts sold in California.

New and improved Suzuki Teka SFI  2

with new TPS display and "MMT" Memory Module Tuner

Finally - Quick, easy, cost effective Suzuki tuning with no expensive "add-on boxes"
Suzuki cruisers and sportbikes

Please click here for more info

Contact Factory Pro
M-F, 9am - 5pm, Pacific time, -7 or -8 GMT

800 869-0497
 USA and Canada

415 883-5620

parts information

EC997 dynamometer information

Product Support /Tech SECTION
click here


Mailing / Shipping address:

Factory Pro
101c Roblar Drive
Novato, CA

And most importantly
Restart back at the HOME page and click on the red box in the top left to find the bike that you want parts for...
restart at HOME page


This Tuning Site has been visited by
people. - the oldest counting service on the web





EFI and Carb Tuning - Most all FI and carb tuning

by Wheelsmith Racing

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

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 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!

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.