I have a AC 400 4x4 and was wondering what was the best way(s) to increase the low-end power on the bike. I don't to do major mods. Any input would be much appreciated. What the best pipe, and what about jets? How much increase in power will I get?

Ken

 

Unfortunately there isn't a way to extract very much low end torque from the 400 motor. I added a supertrapp pipe and a k&n filter to my 400. It added some power but it seems to be more in the midrange and top end. After I get a few more miles on my machine I am going to install a 500 piston and top end on my 400 crank. I think that should really wake it up.

I would suggest just going to a k&n filter first and see if it helps.