What are the most 400 specific common modifications?
The most common modifications to any motorcycle are usually a pipe, individual filters, and brake lines. Rather than go with these typical mods, we’re going to offer some pretty 400-specific mods. The subframe is steel, and weighs almost as much as the frame proper. Most racers cut off at least the miscellaneous tail light mounting points and passenger peg mounts. Many racers hack off large chunks of the subframe in an effort to save weight. An aluminum sub frame can be built as well since the piece is a bolt on, however, the rear shock mount is part of the sub frame, and either has to be recreated, or retained by being cut off and reinstalled. Rear sets used to be a popular modification but the majority of racers simply cut off the pegs at or near the last hole (designed for holding on the rubber foot pad). Most racers remove the rubber, and cut here at an angle to offer more ground clearance. The thing to remember with rear sets is that the further back they go, the closer they get t
