Triumph 900 twin 
EFI models

Bonneville and T100


Fuel Injection Tuning / Reflashing

Triumph, most all FI, inc 675


Custom Triumph Fuel Injection Tuning

The "900" Triumphs are wonderful, modern renditions of the early "unit" and "pre-unit" "Bonnies" and "America's" - were always known as the best handling bikes in the 50's, 60's and 70's.
Smoother and more reliable bikes than the early golden days of motorcycling - a recommended bit of updated twin nostalgia.

Wheelsmith / Factory Pro currently (as I write this) uses Tuneboy and Tune Edit to custom tune and relfash the stock ecu.  Wheelsmith uses the EC997 dyno and a multi-gas analyzer to tune to Best Power while retaining good highway mileage - resulting in a nice clean running bike that has improved power and decreased backfiring.

out of state customers welcome.

Call 415 472 4962 for appointment.

Shift Improvement kit  - eliminate virtual missed shifts

Factory Pro "Shift Spring"   
(it's a specially made spring)

pn: Z95-921-98 spring
(contains Factory Pro performance shift spring - this kit does not contain the clutch cover gasket)

1. Choose your shipping method

This kit replaces this part:
T1190921 Spring, Detent Arm (fits later carbed and EFI models)

Triumph 900 Twins, EFI

Shift Spring

Virtually eliminate missed shifts
  By adding some spring rate, shift are easier to make.
Make your twin shift better than a new bike.

Easier and quicker upshifts, decreased shift lever travel, fewer missed shifts and quick downshifts.

This is the spring that makes the difference.
Track and street.


In 1-2 hours, you can make your shift mechanism work 5% to 10% quicker (2ms to 5ms).

1 -2 hours - requires clutch basket assembly R&R to install

Available from Power Tripp and direct from Factory Pro 800 869-0497

Detent arm Assy
> Eng no 330785
 and lower

early design 790cc carbed models

needs arm update
Detent Arm Assy
Eng no 330786 > 
and later

All EFI model and 865cc carbed models

has good

Spring, Detent Arm
  fits all 900 twins





Contact Factory Pro
M-F, 9am - 6pm, Pacific time, -7 or -8 GMT

800 869-0497
 USA and Canada

415 883-5620

fax 415 492-8803

parts information

EC997 dynamometer information

Product Support /Tech SECTION
click here


Mailing / Shipping address:
Factory Pro
179 Paul Drive
San Rafael, CA 94903

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 ask me how I select the below links - as they aren't all mc related.
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.
The Rich Oliver Mystery School will help you discover your hidden inner strength. 
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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!

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Just say that you saw this on the Factory Pro website!

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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.


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.

Maybe in next rewrite, he'll fix the ignition timing and dyno chapters...
Otherwise great book with great starting ideas.

My bible

The little blue bible for quick references and little known facts.