Thanks, it's a lot of fun. Have no fear of going out and doing it, you're 400ex can do it! Best trail quad ever made, it's little sibling the 300ex is even better for super tight trails. I could just never ride something that small, I'm 6ft tall haha.

 

Here are a couple of pics of my "500EX"

500cc bbk from Four Stroke Tech installed by Diggin Racing
new valves, springs, timing chain and tensioner
Stage 3 Hot Cam, Uni filter, EHS/Outerwears airbox lid
FST reverse oil flow mod with external oil cooler
250r clutches (7 frictions)
XR250 ignition box
Sunstar front and rear sprockets DID chain
DG skid plate and PRM swing arm plate
EBC brakes all around, DWT beadlocks rear and rok-outs front
CST lumberjack tires 22" front and rear
450r front shocks
Choke plate, clutch lock out and parking brake delete mods