Dyno Don Kart Engines
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This is the area of the head to attach the tape measure to for measuring the specs on the new exhaust for the Ducar 212
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Stroke gauge I designed for a fast check.  The predator has made this gauge a valuable tool to have in your tech box
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.031 no go for the air bleeds

This was a ride I took in my first outing after 20 years of not racing.  Funny thing is, the last ride 20 years ago sent me to the hospital with the same kart.  Why I got into this thing again is beyond me.  Two artificial knees, 6 bars in my back and a right foot lis frank sprain.  My wife told me if I do it again I will be sleeping in the garage with it.  The temptation to ride it again is getting worst!!!
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multiple use plugs for internal check points of the Ruxing, Hayui, and Tillotson pk-1
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checking the distance of the e-tube to the .750 step.Tool on left may not push plug on right out of the bore.
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Recommended method of using tool from last picture.  Hold down on solid base and try to slide carb up and down.  If carb does not move it is legal.
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This is an example of using the tool to identify that there is a portion of the machined venturi showing in front of the gauge.  I highlighted the area in red so as to demonstrate there is venturi visible.  The 2020 rules state there must be a visible portion of the venturi in front of the gauge.
This may cause a necessity for a magnifying If you look real close you will see there is a highly machined area of the venturi ahead of the tool that is slid over the e-tube.  The rule says there must be a portion of the highly machined venturi ahead of the e-tube.  Some carbs might need to have the gauge tipped upward or downward to get the venturi to come into view which is permitted.  The use of a magnifying lens may sometimes be called for. 
Go to Youtube to see video. https://youtu.be/8JmS606QzTo

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