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HeWasRidinDirty

2003 quadsport z400

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I got this 400, that wouldn't start. It would try, but wouldn't catch. I checked the valves and the L intake was tight at .002. The compression came in around 120. It didn't improve after a couple of drops of oil into the cylinder. So,I figured it was the valve causing the problem. So, I got the valves squared away, but it still won't start. I checked the spark and it seems like it's getting an intermittent spark. It fires a few times then nothing. If l let up on the button and then hit again immediately, it will fire a few more times, then repeat. So, what am I looking at as a possibility? Electrical issues are not my strong point. LOL

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Oh, and also the camshaft timing seems odd to me. I watched a couple of utube vids and both pointed out a "3" on the intake cam sprocket and a "2" on the exhaust sprocket. The one I'm working on has neither. Each sprocket has EX on one side and IN on the other, not directly opposite each other, either. Someone had painted IN/EX on the sprockets and put some white dots on them where they line up with the top of the cylinder head. IDK if these are some aftermarket camshafts or what.

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Could be a bad cdi. 

I would start by testing some of the regular components to see if there within spec.  

Stator, pick up coil, secondary coil and the regulator/rectifier.  If all of that tests fine then all indications will point to a new cdi.   

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