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OS 21 SE-M / K&B 3.5 Swap

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OS 21 SE-M / K&B 3.5 Swap

Old 11-06-2021, 04:24 AM
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Location: Cottage Grove, MN
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Default OS 21 SE-M / K&B 3.5 Swap

Ladies and Gents. I am swapping a new old stock FIFE K&B 3.5 into my Graupner Arrow to replace the OS 21SE-M it has in it now. The OS is in good mechanical condition and runs well, but I want a little more power. If anyone is interested in the OS, let me know. I figured I’d throw it into the open forum to see if anyone has any thoughts or advice. In a perfect world, I would find a different front housing and crankshaft to maintain correct engine rotation) to relocate the carburetor to be vertical (the K&B was originally setup for a Venturi and exhaust throttle, but I want to use a carburetor and tuned exhaust.
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Last edited by 1QwkSport2.5r; 11-06-2021 at 04:32 AM.

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