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View Full Version : new to forum what is cam mod on 450?


trenton
10-25-2009, 07:47 PM
i just got a 450 and i'm new to the forum wanna know what is the cam mod? thanks alot great site
cosinostra
10-25-2009, 08:44 PM
Go to yfzcentral.com .. There is a ton of info there....
yfzrider690
10-26-2009, 12:24 PM
It is when you retard the exhaust cam one tooth, it makes it rev like the yz450f dirtbike. Gives you more midrange to top end. I also suggest going to yfzcentral.com, they have a full write up with pictures on how to do it.
miles Machine
10-26-2009, 01:20 PM
X2 more mid to top i have noticed that when the engine is warm with the cam mod it starts kinda hard and thats with all the yfz's ive seen
yfzrider690
10-26-2009, 01:48 PM
Mine starts fine when it is warm. I do know that with the cam mod it starts easier if you shim one of the exhaust valves towards the bottom. Can't remember which one because I have a guy that does all my work, but that's what he says and his son races in the pro class and he's the mechanic.
miles Machine
10-26-2009, 08:09 PM
that makes seance shim it so its a little tighter so you still get lift from the decompressor still........the only downfall to that is the possibility that the required maintenance on the valve lash might be a little higher.