Carburetors and Fuel Injection

In this section we will cover everything you need to know to get started tuning your 950's carburetors or 990's Fuel Injection for smooth running, performance and mileage. There's a lot of information here cuz there's a lot of interest on the Forum. So, grab your favorite beverage, and settle in for a long night perusing the articles herein.


Fuel Injection

Tuning F.I. System Description
System Description & Error Codes
Carburetor Syncronization Tune ECU
Carburetor Synchronization
fuel filters
Converting a 990 to Carburetors
Replacing 990 Fuel Filters

Pre-Filters & Aircleaner Upgrades

Uni Filter K & N
SportingWoods Air Cleaner Conversion  


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This site would not be possible without the yeoman's work of fellow Katoom riders, dealers, mechanics, and engineers. Thank you to all who have contributed. I will update this list periodically. If you have some other "Wisdom" that you would like to be added to the HOW, please e-mail them to me at:

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DISCLAIMER: All observations made in these pages are based solely on the anecdotal experiences of their authors. The contributions are reprinted here exactly as posted by the contributors. The spelling, syntax, grammar, etc have purposely not been corrected in order to retain its original flavor. The contributors are from throughout the World, and English may very well not be their native language. Don't be an ass and complain about the lexicon. YMMV, of course. You are "on your own", and I take no responsibility if someone tries anything in this website and gets into trouble with the law, their dealer, significant other, or the manufacturer. Or damages their person or property, or goes deaf, dumb, or blind. If you are not competent and comfortable with the inner workings of internal combustion engines, do the wise thing and defer to an experienced mechanic. Take everything you read or hear "anywhere" butt especially on the Web with a large dose of salt.