speed carb problem please help

3rd possibility is the spark plug wire. Do you have access to a multi meter? I'm sure someone here can point you in the right direction. It's very difficult to diagnose an electrical problem without a meter. You can get them real cheap at Harbor Freight. I got a PDF fron BGF with the ohmages for the different connections. I think the ohmages are also located in a stickey on electrics.
 
It doesn't look like you're grounding the spark plug to the head when you're testing it. My engine kit came with a defective CDI module right out of the box. The spark was weak and intermittent. I got a new CDI and it's been running great. I bought a spare magneto coil and CDI in case one fails in the future.

I tested the defective CDI and working CDI with an analog Triplett meter and a digital Fluke. The results varied depending on the meter type used to test. Neither meter gave me the values I found others had posted for working CDI modules. The magneto coil values were comparable. The low quality of the components used to make the CDI's probably have wide tolerances giving wide variances in the resulting ohm values.
 
Junk plug wire and boot, junk connectors on your wiring.
Those connectors give a lot of resistance. Get rid of them and solder all of your wire connections together and heat shrink them. Those connectors can break internally from vibration and they can become loose over time. They are actually made for speaker wire which is very low voltage.

Get rid of the stock spark plug wire and boot, and get an automotive wire with a rubber boot.

These 2 things may not be 100% of your problem, but they are things that I would consider changing if i were you.
 
It doesn't look like you're grounding the spark plug to the head when you're testing it.

Before I did anything else, I would listen to this piece of advice.
That would help narrow it. You said it would back fire.....it that current, or does it not even try to start. If you find a good strong spark and backfiring but will not start let us know.

If that is the case I can solve it in 2 words. Woodruff key.
 
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Junk plug wire and boot, junk connectors on your wiring.
Those connectors give a lot of resistance. Get rid of them and solder all of your wire connections together and heat shrink them. Those connectors can break internally from vibration and they can become loose over time. They are actually made for speaker wire which is very low voltage.

Get rid of the stock spark plug wire and boot, and get an automotive wire with a rubber boot.

These 2 things may not be 100% of your problem, but they are things that I would consider changing if i were you.
first of all thnx for all the messages but motor shyco the plug is not stock neither the spark plug boot its upgradded and i am goning to solder my connections but not now when i get a new cdi i probly will but is it the cdi or magneto
thnx
 
3rd possibility is the spark plug wire. Do you have access to a multi meter? I'm sure someone here can point you in the right direction. It's very difficult to diagnose an electrical problem without a meter. You can get them real cheap at Harbor Freight. I got a PDF fron BGF with the ohmages for the different connections. I think the ohmages are also located in a stickey on electrics.

no i dont have a multi meter unfortunately
thnx how do i take the spark plug wire off because when i try turning it clock wise it wouldent come off
 
no i dont have a multi meter unfortunately
thnx how do i take the spark plug wire off because when i try turning it clock wise it wouldent come off

Lefty-Loosey, Righty-Tighty. Turn the wire counter-clockwise to remove it from the CDI module. Get a multi-meter for ten bucks or less and learn how to use it. It'll come in handy for the rest of your life.
 
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Lefty-Loosey, Righty-Tighty. Turn the wire counter-clockwise to remove it from the CDI module. Get a multi-meter for ten bucks or less and learn how to use it. It'll come in handy for the rest of your life.

it wont come off even to the left
 
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