I have a 2005 wr 450f. I installed a yz450f exhaust cam, the bike starts great with the kick starter but with the electric starter it does not. The engine seems to crank over fine but will not hit until the throttle is cracked open slightly. The funny part is you must leave the thottle closed when you first start cranking the engine and then while it is cranking crack the throttle. If you crack the throttle open first and then hit the starter button it will not start and sometimes will kick back. So in order to start the bike with the electric starter I must use the above described procedure but it cranks a long time before it starts. I am wondering if anyone out there has added the yz cam and had similar problems. I think it is possibly a jetting issue , but was hoping someone may have run into this before. thanks fried.