Kibblewhite Valves Valve Guides Guide Honda CRF450R CRF450 CRF 450R 450 R 02-08

Description

Kibblewhite valve guides, all 4, for a 02-08 crf450r. Picture is for reference only. Check my other items. Can't find what you are looking for? Just type in what you need in the search box above and click search.
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KIBBLEWHITE TECH SUPPORT / FAQ
6. When I install valve guides how much interference should I allow between the OD of the guide and the valve guide hole in
the cylinder head?
KPMI® recommends that all valve guide hole(s) prior to guide installation be free of gall-marks and are round and parallel. Professional inspection devices are required to perform these determinations. Additionally, Honing, reaming and or boring a valve guide hole may be necessary operations when a valve guide hole needs to meet this criterion. The following recommendation(s) are for any combination of bronze or cast guides and aluminum or cast iron heads.
•  .0015" to .0025" - Intake and Exhaust
•  KPMI® does not agree that an o-ring can allow for the necessary fit required to create optimum heat transfer and or fitment.
Always consult with qualified professionals suited to inspect and repair your engine.
7. I have installed my KPMI® valve guides and want to know how much ID clearance I should provide?
When installing in an Aluminum or Cast Iron cylinder head, any combination of the following: Black Diamond®, White Diamond® or Tensilite® valves, cast iron or bronze guides, KPMI® recommends the following ID clearances:
Aluminum cylinder head recommended valve stem-to-guide clearance is as follows:
•  Intake: .0008" to .0012"
•  Exhaust: .0012" to  .0015"
Cast Iron cylinder head recommended valve stem-to-guide clearance is as follows:
•  Intake: .0010" to .0015"
•  Exhaust: .0015" to .0020"
Note:
•  KPMI® does not recommend clearances for Nitrous or blown applications. The recommendations above are offered in
conjunction with the use of a thin film of Paste-Type, Molly-Based assembly lube, applied to the stem of the valve prior to
installation.
8. How do I size the inside diameter of KPMI® cast Iron or Bronze guides?
KPMI® recommends honing the ID of guides prior to installation to a slip fit to the valve stem diameter, using the valve as a gage or a seat and guide machine pilot as your gage. Cast iron guides are easily reamed and KPMI® then recommends honing them to achieve a surface finish of RMS-32 or better. Bronze guides can be difficult to ream unless in well secured and accurately aligned conditions and preferably with the use of coolant. KPMI® recommends rigid type mandrel hones or diamond hones for controlled ideal results, when honing cast iron or bronze guides.
23. Why don't my new valves fit into my new guides?
When guides are installed into a cylinder head, they distort due to interference fit. All KPMI® guides are designed with undersized IDs to allow the builder to true the ID and set the desired valve to guide clearance.