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FJR Motorcycle Forums
FJR Parts & Accessories Discussions
Valve guide material?
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<blockquote data-quote="Petri" data-source="post: 1367868" data-attributes="member: 90033"><p>My 2005 Euro FJR is having some exhaust valves replaced etc.</p><p></p><p>Now, the machine shop doing the work is suggesting not using the stock Yamaha replacement valve guides, but instead some after-market phosphorous bronze guides. They are quite a lot cheaper and easier to install.</p><p></p><p>The machine shop specializes in cylinder head work - that's all they do. So I guess they should know what they are suggesting.</p><p></p><p>But after googling (better safe than sorry), I became a little concerned, especially after reading <a href="https://www.voc.uk.com/net/docs/3.3b/3.3-274-19.pdf" target="_blank">this warning</a>.</p><p></p><p>Thoughts? Experience? What are the FJR factory-installed valve guides made of?</p><p></p><p>I read elsewhere in this forum that Gen I FJRs apparently tend to wear out the exhaust valve stems and guides. The machine shop owner claimed it's been almost a "known issue" with a number of Yamahas through the years.</p><p></p><p>I wonder if a properly chosen (different) replacement valve guides could mitigate that...?</p></blockquote><p></p>
[QUOTE="Petri, post: 1367868, member: 90033"] My 2005 Euro FJR is having some exhaust valves replaced etc. Now, the machine shop doing the work is suggesting not using the stock Yamaha replacement valve guides, but instead some after-market phosphorous bronze guides. They are quite a lot cheaper and easier to install. The machine shop specializes in cylinder head work - that's all they do. So I guess they should know what they are suggesting. But after googling (better safe than sorry), I became a little concerned, especially after reading [URL="https://www.voc.uk.com/net/docs/3.3b/3.3-274-19.pdf"]this warning[/URL]. Thoughts? Experience? What are the FJR factory-installed valve guides made of? I read elsewhere in this forum that Gen I FJRs apparently tend to wear out the exhaust valve stems and guides. The machine shop owner claimed it's been almost a "known issue" with a number of Yamahas through the years. I wonder if a properly chosen (different) replacement valve guides could mitigate that...? [/QUOTE]
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Valve guide material?
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