here is what i had done to my drz400sm --- i had the man !!! Eddie build mine 470cc , here are the parts -- 94mm mt kit $450 hotrods stroker crank $375 cylinder spacer $100 RHC 187 cams w/ adjustable sprockets $580 RHC spring kit $225 RHC valves,+1mm intake $200 valve guide seals $25 misc gaskets $50 MCCT if you dont have one already $60 labor including refurbishing head,clearancing piston,degreeing cams,head porting,+1mm intake valve etc. $765 you will also need a 41mm fcr-mx $575 and a preferably a yosh ti pipe $700. this a fully prepped race motor.be aware the power delivery is very agressive.
What Shoulda sprung for a ktm 525 16k miles and no matter how hard I try the piston just will not hit the spark plug. See ya soon Anthony and hope the rebuild goes well.
turns out a valve let loose wont be to bad to fix warranty , yes the 525 is bad ass , (your) just i dont like stock so the drz400sm is perfect for us that like to through there money away in to a slow bike hoping to make it fast and one of a kind PS i out pulled a KTM 620 that day before it went , found water in the oil to < >