Just spitballing: Is it possible one of the plating houses could just plate the subvalve hole at the same time as the cylinder bore?chkdx wrote:Regarding (4): This glass-filled teflon might work very well: http://www.mcmaster.com/#standard-plastic-rods/=vqls85
Very slippery, and good to 500 degrees. FWIW, brass bushings, although common, are not very good. Brass typically has poor lubricity and high wear in such an application. Bronze would be better, Oilite better yet, but I think the glass-filled teflon might very well be best of all.
E-Series KIPS, Food for thought, Calling Ron Black, Calling.
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Re: E-Series KIPS, Food for thought, Calling Ron Black, Call
This would make sense...it may make more sense to use an even more aggressive ceramic friction and wear reducer, similar to some of the products available from Tech Line or Jet-Hot.sarrant wrote:Just spitballing: Is it possible one of the plating houses could just plate the subvalve hole at the same time as the cylinder bore?chkdx wrote:Regarding (4): This glass-filled teflon might work very well: http://www.mcmaster.com/#standard-plastic-rods/=vqls85
Very slippery, and good to 500 degrees. FWIW, brass bushings, although common, are not very good. Brass typically has poor lubricity and high wear in such an application. Bronze would be better, Oilite better yet, but I think the glass-filled teflon might very well be best of all.
Along those lines, I was considering taking a clean set of powervalve barrels and getting Tech Line's Diamon-Dyze hybrid ceramic/anodizing treatment to protect the components.
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Re: E-Series KIPS, Food for thought, Calling Ron Black, Call
Plating seems like a good idea. I think at this point we are over thinking. With a strong set of valves, any simple bushing should provide adequate resistance to wear over the life of the top end. Check it for wear, like everything else, when doing the top end. A simple press fit bronze bushing for the lower journal. The collars take care of the top, and we already know they need replacement just about every top end.
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I was just thinking plating because those same parts (or an incompatible, slightly different variant) are now unavailable for the KDX250, which has a lower population of riders...unlikely someone will make steel replacements for me without a huge personal investment. This is becoming a problem across multiple models.
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Yessir, the KDX250 is turning into quite a rare animal.
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Re: E-Series KIPS, Food for thought, Calling Ron Black, Call
These barrels are now unavailable for the '88-'91 KX250 as well...different part number (barrel cutaway)...same problem. Identifying a solution that will extend the life of existing, usable parts of this type for related models would be of great benefit.
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