Question about 2004 Yamaha YZ 450 F
I have just installed a new uprated stator coil on my yz 450 2004 to run lights on my bike as well as the spark plug. However it wont start now at all? I have spark and when i kick her over i do get smoke from the exhaust? every now and again she will back fire like a rifle shot going off. Ive checked all the connections and emptied the carb bowl and flushed the carb through. i keep getting a spark but does the spark need to be a certain strength? It seems normal and strong, and ive also put in a new spark plug? someone please help? Is it the timing or is there some kind of internal shut off for lack of oil or coolant, i just dont know,
regards chris penny
Hi and welcome to FixYa,
Offhand, the backfire is significant. It indicates that fuel is getting inside the combustion chamber and it further confirms that there is spark. Being the case, it would appear that this is now a timing issue. A couple of ideas to explore:
Posted on Dec 15, 2008
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Posted on Jan 02, 2017
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