The Honda CRX HF valve springs are much weaker than the regular Civic/CRX valve springs. And the HF did have a lower redline. 5000 RPM versus 6500 RPM.
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2000 Honda Insight
2000 Honda Insight
2000 Honda Insight
2006 Honda Insight (parts car)
1988 Honda CRXFi
1994 Geo Metro
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