Suzuki DR650
1990 - 2018

Long Boy extended Fuel Screws- finger adjustable



Long Boy Fuel Screw  assembly
new spring, washer and o-ring

pn: CRZ-SCR-5020m
(replaces Suzuki 13279-47070)


1. Choose your shipping method


Jesse Tennant's DR650

Jody Cox   Conway, SC June 2013

Long Boy Fuel Screw

Finger and screwdriver adjustable extended Fuel Screw Kit 

Now with
Straight knurling for better grip
Screwdriver slot to use "if you want to"
Indexing flat to keep track of turns
Smaller head and "Traction groove" for lighter weight and better grip

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 "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 screw, old o-ring, old washer 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".

F-Pro Fuel Screw assembly comes with:
1 Long Boy extended fuel screw
 1 new o-ring
1 new washer
1 new spring

        The cat's meow!  Thanks MARC. Great addition.      Jody Cox, Conway, SC

         sweet deal fits perfectly no issues, thanks again.        Jeffrey Labonte

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

      Awesome!     Tennantw

      It runs great , very responsive.     jet kit and Long Boy fuel screw          Mike  Malsom   Florida

Jesse Tennant's DR650
Long Boy Extended Fuel Screw

Carb Recalibration Kit / Jet Kit

CRB-S65-1.1-TI  $69.95

years: 90-18

1. Choose your shipping method


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!

Includes: a main jet selection, adjustable Ti needle, clips (with extras!), pilot jet, allen screws for the float bowls - all packaged in the most useful plastic case.

Airbox mods are not required - but can be accommodated with main jets.
Heavily modifying the dr airbox hurts my ears.....

Order #5020 extended fuel screw above.

      It runs great , very responsive.     jet kit and Long Boy fuel screw   Mike  Malsom   Florida

Microbearing Pro Detent Arm

If splitting your cases, we can modify your stock arm with a low friction microbearing.

415 883-5620

Tools : diagnostic and setting

TL-float height gauge


1. Choose your shipping method


The only way to accurately measure float heights. Works on nearly every carburetor.

By adjusting the float height, you can change the fuel level and that's how you tune the lowend / cruise and full throttle / lowend throttle  -

This is what I use.


Steve Manning <>
Wed, 28 Jan 2009 23:31:28 -0800 (PST)
Mick Hone Motorcycles <>

Hi Mick,

Your best was well and truly good enough.

The DR650 carby kit arrived today and I have delivered bike and kit to my mechanic this afternoon.
Thanks for the prompt and efficient service.

Being a decrepit old fossil, I'm 56, I remember you as a racer and team owner from Errrrrr, a FEW years ago, when I was mis spending my youth.

Just seems like yesterday really! I'm off to Tassie to annoy my elder sibling in a few weeks and then I'm going to the Superbikes at PI on the way home. I'm riding the mighty DR and may even come and annoy you

as well after the Superbikes. What's that? You'll be away then! I rang Dunlop many years ago for some technical advice and Dennis Neil answered the phone. Quite an interesting conversation especially the story

about his career ending accident. Was it you who "invented" the first sort of GSXR 750 Suzuki by marrying a 750 air cooled Suzuki engine with a frame from a 400cc 4cylinder Suzuki?. Robbie Phyllis rode it I think.

The flamin' early onset Alzheimer's prevents me from recalling the exact details of these important historical matters.

Anyway thanks again,

Stay safe, Steve Manning






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.