Won’t start

Chainlube

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If you pull the plug and then just put it back in, does it run?
 

Greg58

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It sounds like you're getting fuel leaking from the carb after you shut it off, try turning the fuel off a few seconds before you stop the engine to reduce the fuel in the bowl. Sometimes when the carburetor is mounted at an angle this happens.
 

darwin

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I've often wondered about cheap plugs. Do you have an ohm meter? If so test the plug to see if there's any internal leakage. Put one test lead on the top of the plug, other on the thread body. Any leakage? May need to be tested when hot to see. A lot of bad coils only ground out when hot but work at start up.
 

Zachary_

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upload a picture of the USED plugs.

also take one of the used plugs wipe it down real good and try it make sure to get it clean as if it was new

i've had engines start and run and stay running but because the plug got fouled during the running process it didn't wanna start again
They aren’t black they still look new I took it out and wiped it and changed the coil and it started but I didn’t try to start it again will try later and see if it will go
 

Zachary_

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I've often wondered about cheap plugs. Do you have an ohm meter? If so test the plug to see if there's any internal leakage. Put one test lead on the top of the plug, other on the thread body. Any leakage? May need to be tested when hot to see. A lot of bad coils only ground out when hot but work at start up.
Will try thanks
 

Zachary_

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It sounds like you're getting fuel leaking from the carb after you shut it off, try turning the fuel off a few seconds before you stop the engine to reduce the fuel in the bowl. Sometimes when the carburetor is mounted at an angle this happens.
Ok thank you
 

Chainlube

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I pulled the plug cleaned it put it back in and changed the coil and it fired right up but it was late so couldn’t run it for long
Did you change the coil or CDI? Some guys confuse the two.
 

Nickt919

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I've often wondered about cheap plugs. Do you have an ohm meter? If so test the plug to see if there's any internal leakage. Put one test lead on the top of the plug, other on the thread body. Any leakage? May need to be tested when hot to see. A lot of bad coils only ground out when hot but work at start up.
A bad coil can give you fits finding the problem sometimes.
Way back in time...I had a 1977 Yamaha YZ100 I raced MX with. It ran fine until it got very hot. Winter...no problem...hot summer day....shut down and not run until cool. That was my first experience with coils of this nature. Started many races and DNF.

Parts for our engines now are so cheap I'd change just about all electrical to eliminate those potential problems. Then save the old stuff and sort out the good and bad later.
 
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