Kibblewhite
KPMI, exhaust valve guide. Manganese. +.004"
KPMI, exhaust valve guide. Manganese. +.004"
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Manganese bronze is softer and less durable then C630 bearing bronze but will allow a lower cost and reaming to size is quick and easy and finish can be done with simple tools like a ball hone and an electric drill. Rapid heat transfer and good lubricity. Note: Standard non-oversize dimensions (for reference only) are 0.6250" O.D. (15.88mm); 0.3745" ID (9.51mm); 1.91" OAL (48.51mm). Note: Special Manganese reamers & hones are available.
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Why buy from Forty5°
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Verified compatibility
Every part we ship is checked against your bike's platform, year, and engine. If it doesn't fit, we tell you before you check out.
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Workshop installation
Book a serviceHave us fit it. Book installation at parts intake — same-day on most jobs, master techs only.
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Founder-led aftersales
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