I'm doing everything I can to reduce weight on my WR450, my goal here is to get closer to a trail friendly YZ. I'm wondering if anybody here knows if a YZ450's rotor cover will fit the WR, as I am getting rid of all the starter stuff and without the motor I'd have one heck of an oil leak. Also , am I thinking correctly that if I remove the starter motor I should never have to worry about the possible woodruff key failure? It sounds like from everything I've read here that if the motor is gone, there won't be the resistance that will break the key if the engine backfires. I have already removed the idler gear between the motor and rotor so I should be safe, right? I'm going riding this weekend in an area where pushing the bike will probably only last for about five feet, not to mention possible endless ridicule by my friend who has a CRF if the old WR breaks down. Thanks for any info!!