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Engine basics => Four strokes only => Topic started by: Martin Quartim on May 17, 2025, 10:12:26 PM

Title: bore up-sizing an OS FS-40 into a 56!
Post by: Martin Quartim on May 17, 2025, 10:12:26 PM

https://www.youtube.com/watch?v=9yXi55uBFgk

Title: Re: bore up-sizing an OS FS-40 into a 56!
Post by: spare_parts on May 18, 2025, 06:10:59 AM

I have an FS-40S I put the 48/52 piston and cylinder into many years ago. Used the stock rod. It didn't make significantly more power until I added the intake and carb from the 52.