And the ZS172FMM engines are nice. It has the OHC head. I have the 5 speed, used to own the 6 speed (counterblanced). You can buy it with a complete motorcycle with adjustable suspension for under $2000 (Templar). I agree, just buy the bike. THEN tinker! 
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-2022 5 speed Templar X Orange, OEM 51T rear sprocket, 14T front sprocket
-NOS 2020 KTM 250SX (2-stroke motocross), less than 10 hours on it
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