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For the most part, it comes down to is critical Piston speed and the valve train (float)... there are other RPM limiting factors but those are two of the main culprits...
...over the last years, the quality of the materials and the technology used has dramatically improved and the safe range of RPM's has increased... today's limiting factors are more the rods than the pistons, however. As Curve said and Roger reiterated, however, 14.5K RPM is serious for a liter bike.
Keep in mind that a modern sportbike has a piston speed that is somewhere in the 4,000 feet-per-minute range. Twenty years ago this was a racing-only level, nowadays it's covered by a three-year factory warranty! Go Figure...
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2005 R1200GS - 2006 Suzuki DR650 - 2011 Husky TE250 - 2014 KTM690 Enduro - 2022 Husqvarna Norden 901
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