I have a 2006 400ex it has a stage 2 jet,k&n,and full yoshimura exhaust.Thought about a 416 kit with a stage 2 cam,wat do you guys think?Another question is what size sprokets should i get for more speed?

 

Hello,
I do not own a 400ex but what I have heard is that the 416 kit and 426 (may be 424 but I'm pretty sure it's 426) are very good. The only one I've heard negative things about is the 440 kit, which leads to overheating. As for the sprockets, I think you should count how many you have in the front and bump that up by one. I believe that 1 in the front is equivalent to many in the back. Another thing to keep in mind is that increasing the number of sprockets will hurt your low end, but if you love your top end, go for it!

 

thanks murox.thats wat ive hear to,i probly wouldnt get a 440 because of overheating and ive heard they blow alot of head gaskets to

 

Np,
Hope you see some power increases, make sure you tell me how it goes, I'd love to know how big the power increases are with the kit if you get it.

 

id go for the 416, but the cam change is whats gona give u the most power. i would suggets looking at and mabe even changeing the valve seals while your in the head. they tend to leak on the 400ex.

 

DROPPING A TOOTH IN THE FRONT IS EQUAL TO ADDING THREE IN THE BACK. CHANGING THE FRONT ALSO MAKES IT ACCELERATE FASTER BUT MAKES THE ENGINE RUN ALOT FASTER TO. THE REAR SPROCKET IS EASIER ON YOUR ENGINE. FIRST GEAR IS HELLA LOW ON 400EX SO EXPECT TO NOT EVEN USE IT ANYMORE.

ADDING A TOOTH TO THE FRONT IS SAFE, AND CAN ADD A LITTLE LIFE TO THE ENGINE, NOT TO MENTION A COUPLE MPH ON THE TOP END.