Here’s my list of mods that I am going to put on my 2007 400ex let me know what you think and any suggestions.

Suspension – Elka triple rate sport & racing front shocks w/ piggyback reserviors
Elka dual rate sport & racing rear shock w/ remote reservoir

Engine – Head Port and polished
Hot Cams stage 2 cam
Titanium valve springs
Hardfaced rockers
Ice cube/max power 440 bore cylinder
Hot Rods stroker crankshaft and double forged rod (460cc)
K&N replacement filter
K&N Xtreme power lid
Procircuit T-4 slip-on
Stock head pipe for throttle response
Extensive carb tuning
FST secondary oil cooler
Heavy duty clutch springs