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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
ET26/2 Extra Long Rocker Bearing
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<blockquote data-quote="greg brillus" data-source="post: 103018" data-attributes="member: 597"><p>Steve, just a couple of points you may or may not know for carrying out this mod. As you might know the top center section of each rocker will need grinding/linishing down so the rocker can pivot freely to clear the inner anchor nut you mentioned. If you grind some away, you can check for travel but installing the rocker temporarily with the ET 100/1 mod in place in the rocker bearing whilst just holding a rocker pin from one side and move the rocker up/down and you want a good 12 to 15 mm of travel at the fork end. When you bore the holes larger for the anchor nut, be sure the hole is centered as best you can, and deburr the inside of the hole with a small square file, then check visually that the anchor nut with the bolt screwed into same pulls up neatly and fully home in the roof of the rocker bearing.......Sometimes they can sit slightly to one side and this will cause the rocker/bearing assembly to sit cockeyed in the head. Before you finally press the new pins into the rockers, linish a slight bevel/chamfer onto one end of the pin and polish on a buffing wheel. Lube the parts with clean engine oil and press the pin in squarely, and I use an old cam follower spindle to do this. As the pin is an interference fit in the rocker bore, the sharp edge of the new rocker pin can broach slightly and pick up a small amount of metal that tends to grab as it passes into the other side of the alloy rocker bush, and this then makes the rocker very tight when you try to pivot the rocker in the bearing. This is why I tend to bevel and polish the pin on one end to stop this from happening. On final assembly into the head, do not over tighten the holding bolts, just a nice firm nip up is enough, the thread into the anchor nut is small and could damage easily if one gets too carried away. It is a good idea to blow through the feedbolt holes with some compressed air just in case any manufacturing swarf is still present. Good luck with it all..............Greg.</p></blockquote><p></p>
[QUOTE="greg brillus, post: 103018, member: 597"] Steve, just a couple of points you may or may not know for carrying out this mod. As you might know the top center section of each rocker will need grinding/linishing down so the rocker can pivot freely to clear the inner anchor nut you mentioned. If you grind some away, you can check for travel but installing the rocker temporarily with the ET 100/1 mod in place in the rocker bearing whilst just holding a rocker pin from one side and move the rocker up/down and you want a good 12 to 15 mm of travel at the fork end. When you bore the holes larger for the anchor nut, be sure the hole is centered as best you can, and deburr the inside of the hole with a small square file, then check visually that the anchor nut with the bolt screwed into same pulls up neatly and fully home in the roof of the rocker bearing.......Sometimes they can sit slightly to one side and this will cause the rocker/bearing assembly to sit cockeyed in the head. Before you finally press the new pins into the rockers, linish a slight bevel/chamfer onto one end of the pin and polish on a buffing wheel. Lube the parts with clean engine oil and press the pin in squarely, and I use an old cam follower spindle to do this. As the pin is an interference fit in the rocker bore, the sharp edge of the new rocker pin can broach slightly and pick up a small amount of metal that tends to grab as it passes into the other side of the alloy rocker bush, and this then makes the rocker very tight when you try to pivot the rocker in the bearing. This is why I tend to bevel and polish the pin on one end to stop this from happening. On final assembly into the head, do not over tighten the holding bolts, just a nice firm nip up is enough, the thread into the anchor nut is small and could damage easily if one gets too carried away. It is a good idea to blow through the feedbolt holes with some compressed air just in case any manufacturing swarf is still present. Good luck with it all..............Greg. [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
ET26/2 Extra Long Rocker Bearing
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