Yamaha Grizzly

Item Description



FIX that 4700 to 5200 rpm stumble!!!

Factory Pro's nearly 30 years of tuning competition and street carbureted vehicles makes their carburetor kits the logical choice to beef up the already radical Raptor for every weekend warrior out there. 
Factory Pro decided to enter the Quad market and bring that same carburetor tuning technology to the offroad market. 

FIXES that 4700 - 5200 rpm surge problems that stock and dynojet carb kits have.

An EC997 dyno - not a dynojet or Superflow - helped figure that out - So - If you want to actually fix things - use an EC997 Quad dyne dyno.
If you don't care about optimal tuning - don't......

Kits are attractively packaged with short simple instructions for installation and for tuning. If you can clean a set of carbs - you can install this kit. Given a couple of hours, with Factory Pro's attention to design detail, will allow you to dial in your carbs for your new exhaust system!

Extract the most from your Raptor!

Spark Plugs,

Standard replacement plug from the largest supplier of electronic components to the MC industry in the world. ~$3.00
Premium, Platinum, U Groove spark plug.
It is recommended to start a tuning session with new spark plugs.
Denso (ND, Nippon Denso) is the largest OEM supplier for autos and motorcycles of electrical components in the world. Sometimes, people forget that Denso makes pretty darn good spark plugs, too! Wide heat range properties discourage plug fouling at low speed AND overheating at high speed.
We have been using Denso spark plugs in our AMA Supersport bikes since Denso was Nippon Denso and ND. We have found that some standard, <$10, off the shelf, Denso spark plugs work as well as $125 special spark plugs - on a professional roadrace level!
X = 12mm thread with 18mm spark plug wrench required
24 = Heat range. (Hint - it is ~3x NGK #. I.E. an "8" heat range in NGK)
E = 3/4" reach
P = Projected tip type plug
R = Resister type internal construction
Z = Thin platinum center electrode w/ tapered ground (side) electrode
U = "U Groove" side electrode for better spark and finally..
9 = is "pregapped" at .9mm (You should check any "pregapped" plug before you install it..)

True Rear Wheel Horsepower tm   Factory EC997a Eddy Current Dynamometer


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Importations Thibault
165 Rue Sauve

819 569 6212









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

415 491-5920

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


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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.