Beta Alp 350 


Carb Recalibration and extended fuel screws

pn: 5020m
(not for dr350 w electric start unless you shorten the knob)
 with new spring, washer and o-ring

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  Great product, best price around for these and fast shipping! Thanks   Blargins45

American Flags

"Long Boy"
Finger adj. extended Fuel Screw

Frustrated with trying to find an "almost 90 degree"  screwdriver to fine adjust your fuel screws for best idle and cruise?
Use Factory Pro's new "finger adjustable" fuel screws to adjust fuel screws 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 orings, 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".

#5020m fuel crew assembly comes with:
1 Long Boy fuel screw
 1 new o-ring
1 new washer
1 new spring


CRB-S35-1.1-TI   90-99    $59.95
Beta Experimental!
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American Flags

Carb Kit

The Ti ProKit w/Titanium needle. The best material to use in a carburetor. These needles will still be around in the millennium after next. 
The kit, when properly tuned, adds more low-end / midrange and if the proper main jet is selected, more top-end power. Easy to install and tune - no slide drilling!
Easy to tune - it does NOT require slide drilling or use silly soft carb springs that take away from "throttle linearity" and control -

Transmission Shift Improvement

$89.95 arm exchange / rebuild
DR250 / 350   90-99

Bike's old? Misses random shifts? But shift slowly and it shifts fine?
While you are splitting the cases and maybe replacing a shift fork and a couple gears - replace the "detent arm" with Factory Pro's Microbearing Detent Arm.

The DR350 doesn't have very good shift detent action, Factory Pro will, on rebuild / exchange basis, provide a new Ball Bearinged Detent Arm for smoother, quicker shifting.

Note! The DR250 / 350 is one of the few bikes that requires case splitting for detent arm access - so, it's a job to be done in addition to rebuilding the trans or bottom end. Call 415 883-5620
or  0 or

The DR250 / 350 requires case splitting to install Detent Arm.


TL-float height gauge
Customer shortened knob on dr350se electric start bike.
measure float heights. Works on nearly every carburetor.





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...
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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.