Hey guys, my bike runs great, but recently Ive been having a hell of a time starting my '05 wr450. It will no longer start with the button and now takes way too many kicks to start (sometimes it won't start at all). This is a problem that has gotten much worse over the last 3 or 4 rides and the weather hasn't changed much. I checked the valves and they are in spec. This bike has been professionally converted into a dualsport and uses a Baja designs rectifier in place of the stock unit. The stator has been modified. It has a yz ex. cam which doesn't help it start as well. I have checked conections and everything seems to be in good order. The battery is brand new. Using my sons "03 wr250 , I think I have isolated the problem to a weak spark. When I test for spark on my 450, all I get is a single spark when I hit the starter button while grounding the plug against the motor. When I do the same thing on the 250,(450 plug and coil) it repeatedly sparks bright just like you would expect. I tried the 250 coil and plug on the 450 and same thing, a single spark, then nothing. The plug is gapped correctly. From what I have been able to come up with searching this forum, I may have a bad CDI. Does this sound like the problem? Can I use the 250 CDI to test? If I need a new CDI, what years are compatable? Any help would be greatly appreciated.