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-   -   OS 21 SE-M / K&B 3.5 Swap (https://www.rcuniverse.com/forum/speed-rc-nitro-boats-117/11694685-os-21-se-m-k-b-3-5-swap.html)

1QwkSport2.5r 11-06-2021 04:24 AM

OS 21 SE-M / K&B 3.5 Swap
 
3 Attachment(s)
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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