Cam Mod on YFZ

[Thumper1220]

ok starting with an 06 YFZ 450 stock powertrain except for hmf slip on, i am looking to go with a hotcams intake cam and want to know the correct way to retard the stock exhaust cam....

also looking at a K&N air filter and x-stream lid however is there really a need for the lid?.... I dont want to pull the stock lid because there is always mud on top of it when i take the seat off:ermm: ...dont want mud water on the air filter:ermm:

any help/advice on any of this would be greatly appreciated :)

[m36indiana]

look at the HOW TO section for the cam mod

[Thumper1220]

thanks thats a great video

[Thumper1220]

ok i'm kinda new to the 4 strokes someone correct me if i'm wrong...stock compression on the yfz quad is 11 to 1 on the dirtbike motor it's 13 to 1...by doing the "cam mod"
and retarding the exhaust cam 3 degrees...leaving the exhaust valves closed that little bit longer... you are raising the compression to 13 to 1 right?
I miss my 2 stroke...someone help me

someone correct me if i'm wrong....also i was told 12 to 1 is the upper limit for pump fuel any higher means race gas....

help!!:confused: :)

[turcol450]

who ever told you that is wrong. 12.1 you must have race gas and a stock 450 dirtbike is not 13.1 its 11.1 or something not sure but its below 12. bc stock they run on pump gas

[Thumper1220]

ok thanks so i can do the cam mod and still get away with 93 octane pump fuel?

[turcol450]

no problem and yea im pretty sure you can. ive been looking in to it myself .and i never saw anyting about not beng able to run 93 .

[Thumper1220]

Thanks for the help i'm gonna go ahead and do it I'm about ready to check the valves anyways. I am still not sure if retarding the exhaust cam 3 degrees will raise the compression in the first place..enough people have done it so.... If it pings a little or gets hot i'll just mix some better fuel with 93.