Hello, I am having trouble starting a 1985 Honda ATC 200x. I have rebuilt the top end brand new wiseco 10.25:1 piston and all new gaskets. I know I was not supposed to grind the valves but did not know that until after I have already ground them. Completely stock other than the piston in it. It has spark but weak like not able to be seen in a shaded area outside but I think it is just enough to start. I have replaced the ignition coil and the CDI box and the CDI pickup on the cam still no avail to get a stronger spark... But it still wants to start but it is not able to you can hear it fire like 3 times then die and every other kick it will do that. the carburetor is stock with 108 main jet 40 pilot jet the idle mixture screw is missing the washer and o ring so I don't know if that has anything to do with it the needle is on its 4 setting from the bottom where it should be I think. valves are adjusted to .003 both fire and cam timing are correct I believe. One thing is that before I got a new spark plug the old one that was in it was working but around the electrode area it was grayed and that means that it is running too rich. so does anyone know what is going on with it? I would like to get it going again. If I ever do get it running again I have a dg or either a cobra exhaust for it and I plan to upgrade the carburetor from stock to like a 32 mill or whatever is 2 steps above stock. Also, should I run 93 in the engine now since I upgraded the piston? thanks.