Bike Won't Start - Don't Know Why

u know, i had a similar problem, it prob wont be the same answer as mine, buy my kill switch on my throttle was stuck in the off position/ broken... look into that maybe?

Hey guys just to follow up on my troubles, i decided to take a look at the magneto and i knew the problem as soon as i removed the first screw, rust had killed the magneto and shorted out the coil, i opened it all up and there was lots of rust and i unwrapped the magneto coil tape that protects it and found that the coil had shorted and was broken creating a weak spark. I replaced it and all works great!

Brandon,
If your mag was that rusty then you are getting water in there. Seal the hole where the wires exit the motor with silicone gasket sealer. Rain or water from washing the bike will not do the mag any good. I seal the mag cover with silicone as well as the wire exit. Good luck.
Tom

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Age and Treachery Will Always Triumph
Over Youth and Skill

I have a similar problem - I got a kit off of Bikeberry and assembled it just fine (bike store said it was ok), got some gas and motor oil in a 20:1 ratio, then started pedaling and it won't start the engine! Any ideas? The gas tank is leaky too... got to get the fixed :P

By the way, my kit came with the CDI and spark plug already on the engine, but it came with an extra spark plug and this huge bolt that I don't know what to do with.

The 'huge bolt' is likely the clutch and sprocket tool.

Check for spark first, then if you have it, check for fuel flow to the carb. Let us know what you find.

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If it ain't broke, and you mess with it long enough, it will be.

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?

if your cdi is fine...there is two possibilities...magneto....ground....dosconnect the kill switch...check your wire connection...same to same....white wire tape up...check the wires on the magneto....somewhere in that you'll find your problem....good luck and let us know when you are up and running....Dennis

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

__________________
Age and Treachery Will Always Triumph
Over Youth and Skill