Suzuki GSXR 750, 85-87
Factory Pro Series "S03 and S04"

The Carb Recal Kit and the Ignition Advance Rotor perks up the low-end and midrange power and response for quicker warm-up and more response.
The Transmission Detent Spring Kit really puts "snap" into the shifting.

Wheelsmith Racing / Factory Pro's rider Ian Pero won the 1987 750 Suzuki Cup Championship at a rainy Riverside Raceway in southern California. Ian was credited with 2nd in the rained out 1100 Cup race as it was raining and a short part of the track was 1 foot underwater.
My 3 riders were the only guys who wanted to ride in the rain, but, all of the rest of the riders the riders voted to not ride... So.... Doug Polin "won" the 1100cc race by virtue of him having a slightly quicker dry qualifying race.

If only.......


Finger Adjustable "Long Boy" extended fuel screws


Long Boy Fuel Screw Kit
pn: CRZ-SCR-5020m
replaces 13279-47070

fits both CV and
original Mikuni 29mm Smoothbore carbs

 w 4 new screws, springs, washers and o-rings

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"Long Boy"
Finger adjustable 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!Installation:
Remove old short stock fuel screws, old o-rings, 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".

gsxr750 screw assembly comes with:
4 Long Boy fuel screws 
 4 new o-rings
4 new washers
4 new springs


Item Description

SPECIAL KIT if using 38mm carbs from an unrestricted  91-92 gsxr750.

CRB-S21-3.0    $149.95
(mains might not be correct)


NOTE! Factory Pro has NOT tested this kit - you'll be doing some "start from scratch" jetting -  but, I don't think that it'll be very hard, if you know something about jetting. Marc

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How to install 38mm carbs from a later model air cooled 750 onto the 85/87 gsxr750

Intake rubbers from 750, 91-92
Carbs 38mm (with PowerJet) from 750, 91-92 (Mikuni BST38)
Air filters: 4 x K&N  individuals or UNI filters
2 x K&N  RU-2992 or BC 2922 equivalent
We haven't tested the 2922 filters to see if they have enough frame clearance.

85/86 model: CRB-S03-1.0  $139.95
for stock airbox, stock or aftermarket exhaust

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87 model: CRB-S04-1.0  $149.95
for stock airbox, stock or aftermarket exhaust

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Standard drop-in carb kit

for stock airbox, stock or aftermarket stock replacement air filter, stock or aftermarket exhaust

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.

The choice of Suzuki Cup racers.

non-USA bikes must use USA style 09494-00530 emulsion tubes.

85-86   CRB-S03-3.0   $149.95

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87   CRB-S04-3.0   $149.95

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Config 30 carb kit

Requires removal of stock airbox and running K&N or equivalent individual air filters. Otherwise, it is a drop-in kit. Low-end response is as good as, if not better than stock carb tuning.

non-USA bikes must use USA style 09494-00530 emulsion tubes.


Ignition Advance Kit

This simple, bolt-on advance kit advances the timing. With stock engines with stock compression ratios, there is more power everywhere. Part throttle power is better - helping corner exit speeds. Improved in-town drivability and quicker warm-up. REQUIRES an AIR IMPACT wrench to install.
F-Pro Shift Kits

SHFT-PRO-SUZ-3  $149.95
(add $20 for Hybrid ceramic bearing upgrade)

F-Pro steel microbearing detent arm, F-Pro shift spring, oil pan and 4 exh gaskets

("Legacy kit" - allow 1-2 weeks for building)

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Microbearing Trans Detent Arm and Spring and oil pan gasket Kit

Make shifting quicker and virtually eliminate missed shifts. This is exactly the same type of kit that Yamaha Racing has used.

This kit will not fix a damaged transmission - If the bike is constantly kicking out of second gear, you really need to split the cases and replace 2nd gear, the gear it mates with and the second gear shift fork.

TL-float height gauge


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The only way to accurately measure float heights.

Works on nearly every carburetor.

True Rear Wheel Horsepower Factory EC997a Eddy Current Dynamometer

Looking for your idle mixture screws?  Here is where they are located:



Subject: I called you last week whine about the 36mm CV carbs that I was trying to tune on my `86 GSXR-1100.  LOL
...and after all the playing around that I did, I finally have it about as good as it's going to get - oddly enough, I arrived right back at the base-settings from the jet-kit (or very nearly so).
Main - #152.5
float-level 15mm
pilots-OEM (I forget what size OEM is)
fuel/air-screws - 3 1/2 turns
needles - clip#2 (from the top)
slide-holes - unrestricted
UNI "pod" filters installed (no airbox)
YOSHIMURA 4-into-1 exhaust system (street, with yosh can).
+3 degrees (over OEM) static ignition advance
The 36mm carbs are originally removed from my `89 GSXR-1100 and have your carb-kit "config-3.0" in them from that bike.  I'm in Kent, WA wich is nearly sea-level and it's been dry and temps in the 70's (occasional 80's) during all of my tuning-experiments.
...the emulsion-tubes are brand-new OEM parts, and the valve-lash is set to the "big" side of the OEM spec.  I used the rubber "boots" that were originally meant for the 34mm OEM carbs, but the 36's fit in there after a lot of pushing and shoving(new, larger hose-clamps are necessary).  The biggest trouble is that the OEM petcock only has one outlet, so I had to switch that out(I used the OEM from a later model GSXR, but plan on installing a pingel as soon as UPS delivers it to me). 
The bike works pretty well... I don't have access to a dyno so I use a moderately-steep hill near my house to do full-throttle "chops" on and then read the plugs.  It passes all the tests in your tuning guide, and the mains produce the best top-speed available up the hill.  I was expecting to get better results... not that I'm unhappy with the bike... I just kept expecting to get the scary-torque at 4-5K like the 1127 motor makes... and I've reached the conclusion that the 1052 just isn't going to do evil, unintentional first-gear wheelies like the 1127 does.  It *does* pull quite well in the upper revs... feels like a super-bad-*ssed 750 more than a liter-bike though.
ANYway, that's the good, bad, and ugly about it - I thought you might like to know so you can add it to your database.
-Jacki Gregory



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.