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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Modified Rocker arms
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<blockquote data-quote="davidd" data-source="post: 129705" data-attributes="member: 1177"><p>I believe that it is the nut that needs to be ground down to a "knife-edge" on both sides. This eliminates much of the grinding on the rocker arms themselves. It is the rocker that is hitting the locking nut that causes much of the clearance problem.</p><p></p><p>[ATTACH=full]38269[/ATTACH]</p><p></p><p>Stock on the left, fitted for clearance on the right. </p><p></p><p>The matching rocker arm is at the top of the photo.</p><p></p><p>[ATTACH=full]38270[/ATTACH]</p><p></p><p>I installed the modified rockers in the engine I built for David Tompkins in 2018, which has run well to date, redlining at 7,000 RPM.</p><p></p><p>David</p></blockquote><p></p>
[QUOTE="davidd, post: 129705, member: 1177"] I believe that it is the nut that needs to be ground down to a "knife-edge" on both sides. This eliminates much of the grinding on the rocker arms themselves. It is the rocker that is hitting the locking nut that causes much of the clearance problem. [ATTACH type="full"]38269[/ATTACH] Stock on the left, fitted for clearance on the right. The matching rocker arm is at the top of the photo. [ATTACH type="full"]38270[/ATTACH] I installed the modified rockers in the engine I built for David Tompkins in 2018, which has run well to date, redlining at 7,000 RPM. David [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Modified Rocker arms
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