ST2 engine is the same basic 'block', just got a 2mm bigger bore, water cooling and fuel injection, so you'd need to mount a radiator and modify the electrics for fuel injection.
Not too difficult to do, or you could mix 'n match engine parts; use the 944cc cylinders & pistons plus the ST2 cams in the 900 engine for a 944cc Monster without a radiator for a more classic Monster look.
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M900, 916, LeMans II.
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