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Author Topic: Needle Valve Assembly  (Read 358 times)
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Copper Member

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« on: December 21, 2012, 10:24:09 AM »

Hi Boys,
  I like the PA style nv assembly from Randy Smith at Aero Products. It has a polyurathane crush washer to put pressure on the needlevalve needle so it doesnt turn. The spray bar is stainless (on the Fox nv) and it is undercut in the venturi area so you dont choke down the engine. Personally I like to cut them off short , just at the end of the threads with a cutoff wheel. i put a small flat in the side, to catch the set screw in a 3/32 wheel collar. Replace the set screw with a short regular screw, then you have a "pointer" to show how much you turn it. If it is short enough inverted landings won't bend / break the nv off. I hate that. To finish it all off I use a drop of Loctite on the wheel collar to keep the vibration from doing bad things, a blast from the heat gun sets it with no drips. On the LA .40-.46 you will need a 5/32 (.156) reamer. I have a drill chuck I hold in my hand use the reamer from both sides. Keep the reamer "square". When you finish the second side push it all the way thru , and wiggle it a small bit ( clearence). If the nv doesnt go thru flip the venturi. If it still doesnt go you need to open the venturi the same way. then assemble stick the reamer thru  , wiggle , and voila.

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Needle Valve Assembly
Needle Valve Assembly
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