Yamaha TTR125


Long Boy Extended Fuel Screw - adjust your fuel screw without tools

Kit includes:
F-Pro extended fuel screw
new plated spring
new washer
new o-ring

replaces oem

$23.99 + $14 UPS Ground shipping - tracked and insured

1. Choose your shipping method

pic courtesy of Dave Hamilton

Factory Pro saw a need for an easy to adjust, extended fuel mixture screw for the ttr125.

Here it is. The Original Extended fuel screw for the ttr125.

For the past several months, I've been working with Marc Salvisberg, the wizardly owner of Factory Pro Tuning, to create a finger-adjustable fuel screw for the OEM Mikuni carburetor on the TT-R125. Tonight, my friendly neighborhood UPS man delivered the prototype to me, and I could hardly wait to install it in my TT-R125E.

I'm sure you're like me, and you fiddle with the fuel screw all the time, but it's a major pain to adjust, as I'm sure you know. Well, our days of envying FCR-equipped bike owners with finger-adjustable fuel screws are over.

Marc came up with a "T-handle" fuel screw design that works perfectly. You can install it without removing the carb from the bike, and it's a perfect length--long enough to clear the rather tall fuel bowl on the TTR, but not too long so that it's obstructed by the clutch cable located below the carb. The "T" profile on the end is very easy to index, and its shape is easy to get leverage on with your two index fingers. All in all, it's a big success, and I let Marc know that the design is ready to go to market.

Marc has set a retail price of $XX.95 for the screw (which includes the required spring, washer, and correct-size o-ring), and they are available from his company (Factory Pro Tuning). You can log onto
www.FactoryPro.com for Marc's contact information.

Get in touch with Marc and Factory Pro and "get you one"!  415 491 5920

Sean Bice

Help protect transmission gears and forks from damage caused by missed shifts

Hybrid Ceramic Microbearing
REPLACES 5HH-E8140-00  05-14

1. Choose your shipping method

Factory Pro Microbearing Shift Detent arm

Low friction CERAMIC balls and STEEL races

Ever cringe when you see your school students attack your poor shift lever like they are stomping on a 6ft Diamondback Rattler?

Decrease friction for quicker shifting.
Fewer missed shifts.
Helps prevent gear and fork damage caused by missed shifts.

Thanks to
Marc Salvisberg @ Factory Pro
We have much improved shifting in our Yamaha TT-R's by installing his bearing detent arms.

Rich Oliver's Mystery School
559 855-3089
Auberry, CA
(Fresno area - close to northern and southern CA)
Dec 2014


I read on Thumpertalk ( http://www.thumpertalk.com/forum/showthread.php?t=650639 )

that you now have an adjustable fuel screw for the Yamaha TTR-125. 
Can you help me out?
Thank you, Brent McDonald


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
www.digits.net - 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.