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Hello,

98 Trailblazer 250 ran great 2 weeks ago, today it will not start. Checked spark and it's strong. I removed carb and cleaned it. Set the mixture screw 2 turns out. Checked compression and I have 90-100. My question is how much compression do i need for it to run, and how long should I crank it to get an accurate reading?

Thanks
 
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