I answered my own question for anyone following along at home...
The 666-813--F Conversion Kit is for the MS-4SPA 10-5009 converting it to a -5009N. Kit includes Power Jet Gasket, Nozzle Gasket, Nozzle Assembly, Throttle Body Gasket, and 4 nuts.
There is a Lycoming Service Instruction 1305c about the conversion (Which I would hyperlink but I can't seem to find it on the Lycoming website. I have a .pdf of the SI that I can send anyone needing it. If you email me for it, please remind me the file name is 1305c.pdf)
The 666-862--F Conversion Kit is part of a CubCrafters STC and is for a different Carb number, not the 10-5009. Weather it works or not for you, is up to you. I'm just relating what I was told via a phone call directly to MS Carbs.
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-Justin
RV-4 N249P
O-320, Dual P-Mags, Warnke Prop, GRT Sport EX
Last edited by Jvon811 : 03-14-2018 at 02:23 PM.
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