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Norton Box Layshaft Gear
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<blockquote data-quote="medat727" data-source="post: 123774" data-attributes="member: 1982"><p>The straight sections are 1.625” x .035” grade 2 titanium tube sourced through eBay, the trick was the 180 degree bend coming out of the head. To fabricate that radius in 1.625” tube was going to require multiple pie cuts welded together which is quite a bit of work, as it turns out, Yamaha builds a 450cc single cylinder motocross race bike that came stock with a factory built titanium header, that, while obviously being a metric dimension, is almost exactly 1.625” in diameter.</p><p></p><p>While you could probably flange the end of the pipe where it fits into the head and use a stock exhaust nut I was able to set it up as a slip fit with springs that works with an exhaust nut that was supplied by David Dunfey. When it came to the welding it requires the tube to be purged, we used high temp silicone plugs, barb fitting on one end for the supply line and just a hole in one on the other side, grade 1 filler rod and my welder says it’s actually enjoyable to weld.</p><p></p><p>I’ve included a picture of the Yamaha header, what I find interesting is that a modern 500cc performance single has the same pipe size as a 500cc single built in the 1940’s, coincidence?</p><p>[ATTACH=full]35896[/ATTACH]</p></blockquote><p></p>
[QUOTE="medat727, post: 123774, member: 1982"] The straight sections are 1.625” x .035” grade 2 titanium tube sourced through eBay, the trick was the 180 degree bend coming out of the head. To fabricate that radius in 1.625” tube was going to require multiple pie cuts welded together which is quite a bit of work, as it turns out, Yamaha builds a 450cc single cylinder motocross race bike that came stock with a factory built titanium header, that, while obviously being a metric dimension, is almost exactly 1.625” in diameter. While you could probably flange the end of the pipe where it fits into the head and use a stock exhaust nut I was able to set it up as a slip fit with springs that works with an exhaust nut that was supplied by David Dunfey. When it came to the welding it requires the tube to be purged, we used high temp silicone plugs, barb fitting on one end for the supply line and just a hole in one on the other side, grade 1 filler rod and my welder says it’s actually enjoyable to weld. I’ve included a picture of the Yamaha header, what I find interesting is that a modern 500cc performance single has the same pipe size as a 500cc single built in the 1940’s, coincidence? [ATTACH type="full"]35896[/ATTACH] [/QUOTE]
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