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FJR Motorcycle Forums
Technical & Mechanical Problems
Valve check... Should I leave well enough alone or dig in
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<blockquote data-quote="RossKean" data-source="post: 1388078" data-attributes="member: 19880"><p>I adjusted 6 of 8 intake valves at ~100,000 miles or so. I sanded the shims with a 70th percentile target. On my last check (~175,000 miles, I think), two intake valves needed a bit of adjustment (perhaps I was off a bit with the original setting?). In truth, they were right AT the limit but I don't plan to be back in there much before 225,000 miles so I made the adjustment. Haven't had to touch the exhaust valves yet.</p><p></p><p>Note: For the skeptics who say that valves MUST NOT BE SANDED OR GROUND because of surface hardening - BULLSHIT!! When I removed a couple of previously sanded valves, there was absolutely NO indication that there was any wear on the shims or mushrooming that you would expect if the steel was too soft. These are shim-under-bucket and the cams never even come in contact to abrade the surface. The valve stem makes a barely perceptible mark on he other side (not a dent or depression). Not to mention the fact that you would have to sand for a week or so to make a significant impression on a case-hardened piece of steel! Sanding takes a little patience but it only took me an hour or so with 220 grit carbide wet paper (finished off with 400 grit) to do 6 shims.</p></blockquote><p></p>
[QUOTE="RossKean, post: 1388078, member: 19880"] I adjusted 6 of 8 intake valves at ~100,000 miles or so. I sanded the shims with a 70th percentile target. On my last check (~175,000 miles, I think), two intake valves needed a bit of adjustment (perhaps I was off a bit with the original setting?). In truth, they were right AT the limit but I don't plan to be back in there much before 225,000 miles so I made the adjustment. Haven't had to touch the exhaust valves yet. Note: For the skeptics who say that valves MUST NOT BE SANDED OR GROUND because of surface hardening - BULLSHIT!! When I removed a couple of previously sanded valves, there was absolutely NO indication that there was any wear on the shims or mushrooming that you would expect if the steel was too soft. These are shim-under-bucket and the cams never even come in contact to abrade the surface. The valve stem makes a barely perceptible mark on he other side (not a dent or depression). Not to mention the fact that you would have to sand for a week or so to make a significant impression on a case-hardened piece of steel! Sanding takes a little patience but it only took me an hour or so with 220 grit carbide wet paper (finished off with 400 grit) to do 6 shims. [/QUOTE]
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FJR Motorcycle Forums
Technical & Mechanical Problems
Valve check... Should I leave well enough alone or dig in
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