I want to buy a 2001 yz426f a guy has for sale. This thing is a bit ragged and he says it needs new valves and timing chain. I'm pretty mechanically inclined but I've never done a top end before. How difficult is it to do your self? Any special tools req'd? How much would the parts cost me?? The guy wants 1000.00 but I think I can talk him down to 800. I want to supermoto this thing out. Good deal?? Good bike to start out in supermoto? I'm clueless... thanks.