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I bought a used Manco Silver Fox GFX about two years ago for my two girls. Now 12 and 14. The engine it has on it is an old roto tiller engine that is too old, small and hard to start. The rest of the kart is in decent shape.

I am looking for any expertise on motor type, size and torque converter I should consider. I have been looking at the honda motors, but i think the briggs may be more aligned with the value and reliability I'm looking for. I also have been looking at the new replacement TAV2 torque converters.

Any input is appreciated. I grew up riding dirt bikes, but go karts are new to me. My girls are on my case about fixing the go kart so, I figure I just need to get it done. Thanks in advance!