The CRF has a lower compression ratio than the WR (10.7 vs. 11.8) and a larger oil capacity (1.8 vs. 1.5 litres). Thus the oil doesn't work as hard as in the WR and would probably go the distance if you use good quality oil.
But the CRF is heavier than the WR and has less power, so the WR's power-to-weight ratio is much better,
Power vs Serviceability. Decisions decisions... Good luck
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Squily
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