So many mods it’s hard to list them all, the gist is this has an HRC works crank (unobtainium) and valvetrain, putting 140s down to the rear wheel. It’s a substantially snappier bike that stock, forward facing race rads so no cooling issues, all lines etc, SP2 swingarm and throttle body, Ladybird full titanium high mount exhaust, aftermarket adjustable levers, flush LED signals, under tail, yada yada. Much more I’m forgetting in the moment. Considering selling to fund a 450GP track bike build, while keeping my wife. Bike is perfect and the nicest built and condition 2000 RC51 you’ll find. Only trade, this exact model: CRF450L, has to be the L.