This is a simple write up for any year yamaha yfz450 quad to convert to yz450f cam timing.... also known as the "cam mod". No this will not hurt nor damage the motor in any way IF done correctly. I know some people have heard that there could be some issues with doing the cam mod on an '06/'07...

Ok guys this thing has been out for a bit lets start sharing what we have. Post up your aftermarket parts, elevation/city, a basic map, and any dyno sheets if you have had a custom map built and dont mind sharing it that would be great, if I forgot any relevant information feel free to post it...

This is a pretty basic outline for jetting on the YFZ450. These settings are for sea level if you are anywhere from 1500ft to sea level these settings should be very close to right on. Anything above 1500ft should lean the settings accordingly. Also, as a good adjustment you should raise the...

there are lots and lots of carburetors out there....lots of differences...so i will condense the majority of the thread to info pertinent to my all time favorite 4-stroke carb... the KEIHIN FCR carb.... keihin is a subsidiary of Honda Motor Corp... and their 2-stroke and 4-stroke carbs are state...

Maybe we should start a compilation of jetting specs according to exhaust type, mods. and location...might give other members a place to start when modifying their bikes. Just a thought...I'll list mine soon as I get home from work and figure out what they are, exactly.