Boulevard  C-50 C-50c C-50t C-50ct

Needle Jet Rebuild - using patented multi-jet discharge HDJ needle jet

Carb Rebuild Feedback

Good morning, just letting you know the carbs you repaired work great .
Suzuki single carb vl800 Needle Jet Rebuild Service

Factory Pro was the first to seriously address the needs of the 800 community -

From the first:
C-50 Carb needle jet replacement service (and still the Only HDJ needle jet source)
toll free tech support - talking to a real person - not just email - 800 869-0497.

We always endeavor to provide complete service and tuning help.

new needle,
new HDJ needle jet,
 new pilot jet,
new main jet,
float height adj,

new Extended F-Pro Fuel Screw ($25 value)
new F-Pro jet kit ($90 value)

All for $220

Note:  externally dirty carb will have $40 cleaning charge.

The Factory Pro HDJ System allows leaner jetting without surging than the stock style needle jet for best mileage and the "others" can't claim that.

Also - If we've rebuilt your carbs to HDJ specs AND you own the bike long enough to wear the needle jet out again - we will replace it for $100 + shipping and handling -

Carb Needle Jet Rebuild
featuring the patented HDJ Needle Jet

Also - needle jets wear out.- How to diagnose and repair...

  1. I used to get 40+ mpg and now, I get 25 mpg.........

    1. If that's true for you, you will need to rebuild the carb needle jet - It's not necessary to replace the carb body for $400.

    2. We will rebuild your carbs' needle jet orifice by replacing the original worn-out needle jet (they aren't normally replaceable) with our new plated and patented HDJ (High Dispersal Jet) system.

    3. This Factory Pro developed and patented HDJ system will both replace the worn needle jets and improve and upgrade Mikuni's traditional method of delivering fuel through the needle / needle jet area.

  2. How special is the patented HDJ fuel delivery system?

    1. It's patented, and it IS different - if you didn't know what you were looking for in the carb - you'd never see it. It atomizes the fuel better than any other needle jet concept.
      But you'd feel the difference.


  3. HDJ needle jet Benefits include:

    1. Better mileage (commonly up to 39+ if the fuel level is adjusted for best mileage, even without the airbox)

    2. Smoother running at cruise

    3. Better "snap" throttle response

    4. Better fuel atomization = reduced emissions = more power

    5. Better throttle response = fuel is atomized better = more power

    6. Better, more consistent idle

    7. Plated needle jet = lasts longer

    8. Patented HDJ fuel delivery system - not cheap round inserts w/o HDJ.


  4. The carbs must be well packaged in bubble wrap (not peanuts) and sent to:
    Factory Pro
    179 Paul Drive
    San Rafael, CA.

    (415) 883-5620

    1. Typical in house turnaround time is ~1-2 working days.

    2. Cost: $220 + shipping (as of 01/1/14) including:

      1. new HDJ needle jet AND

      2. new CRB-S48-3.0  or 1.0 carb Recal Kit installed to base settings AND

      3. Special!  Long Boy Extended Fuel Screw - add $20

      4. (note externally dirty carb will be charged $20 additional for cleaning)

      5. Customer will be called for payment and shipping instructions in 1-2 days when the job is done.


  5. AND - if the original owner ever wears out the HDJ needle jet again?  We will replace them again for $100 + S&H

    1. Call 415 491 5920 before sending.   Thanks - Marc


Extended length Fuel Screws for easier adjust.

Long Boy Fuel Screw Kit

pn: fuel screw set,VL800

$24.95 / set of 1

1. Choose your shipping method


"Long Boy"
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 screw, old o-ring, 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".

1 Kit comes with:
1 Long Boy fuel screw
1 new o-ring
1 new washer
1 new spring


  I received my Long Boys for my 1500LC and installed them. I adjusted them to my liking and they are great¦
Thank you 
Bob Meloche

item description

CRB-S26-1.0   $89.95

use with stock airbox
1. Choose your shipping method


Positive feedback rating   Runs better than my old carb kit did.

STD drop-in carb recal kit

Adds more power at all throttle positions when properly tuned - For use when using the bike's original airbox.

This kit will allow tuning for each individual bike and bolt on exhaust systems.
Works well with stock exhaust or modified stock exhaust.

This is the kit of choice - pulling stronger at part throttle and at full throttle.

CRB-S26-3.0   $89.95
use with pod filter
1. Choose your shipping method

Config 30 Carb Kit

For those who have
removed their bike's airbox and are running K&N or similar air filter.

Adds more power at all throttle positions when properly tuned -
This kit will allow tuning for each individual bike and bolt on exhaust systems.
Works well with stock exhaust or modified stock exhaust.

This is the kit of choice - pulling stronger at part throttle and at full throttle.

TL-float height gauge
1. Choose your shipping method



The only way to accurately measure float heights. Kowa Seiki's tool works on nearly every carburetor.

Must be a pretty good tool as I used an identical one to adjust the floats in the 60's on a Honda 90 - and it hasn't changed a bit since then!

Fri, 20 Aug 1999 16:21:53 -0500
"_nichols" <>
To:  <>

I have installed your Config 10 kit on my VS800, which has Vance and Hines slip-ons, with the quiet baffles installed. I previously had the CXXXa kit installed, and the thing ran way too rich, even after lowering the needles (the needle they supply is much shorter than stock!) As you probably are aware, the CXXXa kit requires you drill the slide lift holes. Well, after installing your kit with the slightly leaner mains supplied ( I elected to go with the set up you had with the Cobra slip-ons, step by step), the throttle response was great off idle. It used to rev very rich and wet, almost to the point of shutting off. It pulls evenly off idle in second gear, but then it seems to lean out just a tad above mid range. So, after all this, here's my question; Is the bike transitioning too quickly to the mains because of the slides being drilled, and if so, can you compensate for it by dropping/shimming the needles, or should I raise/shim them? Should I go back to the stock mains, or should I try the richer one's in our kit? Or worse yet, did I trash my slides by drilling them? Any help would be greatly appreciated. I have heard nothing but good things about your products, and judging by the kit I purchased, you guys are awesome! Hope to hear from you soon.

____ Nichols
72 5th Street
Shalimar, FL 32579-1367

General Technical Support











Absolutely NO carb parts sold in California.

New and improved
Suzuki Teka SFI 2
with new TPS display and "MMT" Memory Module Tuner feature

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

no fax

Factory Pro
101c Roblar Drive
Novato, CA

If it's
4pm at Factory Pro it's 9am in eastern Australia.

parts information

EC997 dynamometer information

Product Support /Tech SECTION
click here

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
Clock widget          




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.

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 -

Train to Win
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 and P-51 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! Call ahead in the winter.

Make your next tour Unforgettable,  Affordable and Exotic.
Superbike Tours Thailand - See you there.
Supwebike Tours Thailand
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.

Artisan Crafted Fine Cheeses – Since 1865   -    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.