Manufacturer's ref: 30-30620 — KIBBLEWHITE Valve Guide (C674). Designed for the refurbishment of exhaust guides on off-road motorcycles (enduro / motocross), this C674 bronze guide — manganese alloy — offers a softer material, making boring and honing easier. It can be machined quickly with a Kibblewhite ball hone and an electric or battery drill, while maintaining strict KPMI® tolerances and exhibiting lower strength and durability compared to premium C630 nickel-aluminium bronze guides. Made in the USA.
- Application: exhaust
- Material: C674 (bronze / manganese)
- Outer diameter: 0.3965" (≈ 10.07 mm)
- Inner diameter: 0.1956" (≈ 4.97 mm)
- Machining compatibility: boring and honing with Kibblewhite ball hones — usable with electric/battery drill
- Origin: made in the USA
Ideal for motorcycle specialists and DIY enthusiasts looking for an easy-to-machine guide for the quick reconditioning of valve seats on enduro/motocross machines. Compatible model examples: HONDA CRF 250 X (ME11) 2017-2018 and HONDA CRF 250 R (ME10) 2017. Check dimensions before installation to ensure a precise fit.
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