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Hellbent Hillbilly
A friend of mine is doing his cam mod on his YFZ450 this weekend and he claims that he will need to rejet the carb after doing just a cam mod using the stock cams. I don't feel that there will be any jetting changes due to the fact that the cam mod is using the same cam timed differently. Also I can't see any reasons for a mixture change.
Has anyone done the cam mod that can shed some light on this subject? Thanks!
Rider11x
2001 Honda 400ex XC Racer (SOLD)
2006 Yamaha Grizzly Realtree Camo
*Donegal Yamaha and Polaris*
****Tell them I sent ya!*****
Senior Member
Yo 11,
the general concensus is that he WOULD have to rejet. IT tends to shift the power upward a little, and makes it breathe better on top, therefore a somewhat richer mixture is in order. I aint no genius, but that is what everyone else thinks...
Maxx
08 kfx 450r
Phoenix Performance Pipe
Fuel customs Intake
Dyna tek FI controller
Senior Member
Sorry, He'll need to rejet if he has the stock jetting. He should anyway though cam mod or not......Originally posted by RIDER11X
A friend of mine is doing his cam mod on his YFZ450 this weekend and he claims that he will need to rejet the carb after doing just a cam mod using the stock cams. I don't feel that there will be any jetting changes due to the fact that the cam mod is using the same cam timed differently. Also I can't see any reasons for a mixture change.
Has anyone done the cam mod that can shed some light on this subject? Thanks!
jarsong
08 Yamaha 250 Raptor
08 SuzukiLTR450
03 Suzuki LTZ400
07 DRR DRX90 Limited
No wackin in my toolshed!
YFZ jetting from the factory =
Senior Member
<-----Not a chick
2004 yfz450
PRM bumper,
PRM skids,
protaper bars and mount ,
kill switch just incase,
Ac propeg nerfs,
ASV clutch&break levers,
LRD full system,
Hole shot mxr4s
Laker customs
Lonestar axle
Houser +2 arms
TCS shocks
Hellbent Hillbilly
My quote from Crazy Honda's sig:
Well he added a LRD pipe, and now it's over. That #$%^&%@ quad is a screamer and sadly toasts my 400ex. My glory binge is over!
That is my words pre Cannondale ride. You had better do all you can do to beat that Dale.
On the jetting subject: What is the reasoning behind this? The timing is all that is changing, correct? If the mixture is good before the mod, what makes the difference? Not disagreeing...........just trying to understand the big picture.
Rider11x
2001 Honda 400ex XC Racer (SOLD)
2006 Yamaha Grizzly Realtree Camo
*Donegal Yamaha and Polaris*
****Tell them I sent ya!*****
Senior Member
Hey....
look at these graphs. http://www.gtthunder.com/YFZ450.html
I am not sure, but from what my limited brain can understand, the Cam mod makes the motor "hungrier". IT likes to eat more, and breathes better with the cam mod, therefore, from what I am told, more jet is required.
Maxx
08 kfx 450r
Phoenix Performance Pipe
Fuel customs Intake
Dyna tek FI controller
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