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Originally Posted by RedeyeRaab  Alright so this is my second build and the first works great, this one not so much. I have tried 2 different spark plugs and 2 different CDI boxes and it won't fire! The wiring is correct and was both times. There is a good flow of gas because when I take out the plug there is a little gas on the end. I have tried just about everything... the second CDI box I know for a fact works because it is now on my first build which I just got done riding. If anyone has any suggestions please help! Also how would I check my spark plugs (check spark?) to se if they are bad?  |
To check if your plug is firing you need to remove it, plug it into the boot, lay it against the cylinder head fins so the threaded end is securely grounded to the engine and rotate the rear wheel with the clutch engaged. You should see a spark between the plug electrodes. If not, replace the plug. Still no spark? Check your connection at the CDI where the plug wire screws into it and the plug boot. It sounds as if you have eliminated the usual problems such as incorrect wiring, defective kill button, etc. Try the plug test and get back to us with the results.
Tom