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Fouled plugs on warrior

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Joined
Apr 29, 2017
Messages
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I have a 74 warrior and did an extensive ground run the other day. Days later, went to start and the engine was super rough, wouldn't idle and wouldn't even shut down unless I used the key. Mech cleaned all plugs and it's back to normal. We have not been leaning on the ground at all and hardly ever in the air due to below 3000. My question is, how far back to you lean on the ground? I have to go past half to get it run rough. What's a good technique?
 

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