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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Norvin - Exhaust System
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<blockquote data-quote="davidd" data-source="post: 130856" data-attributes="member: 1177"><p>The first photo in post 62 shows a weld that looks very hot, but when you look at the second photo you can see what went wrong. The weld was done with no back purge of argon. A weld that has no back purge tends to run hot and it concaves. If you look in the pipe you can see all of the "sugaring" you get when you do not purge the inside of the pipe with argon.</p><p></p><p>If you back purge, then the weld on the inside should be smooth and silver.</p><p></p><p>As Glen says, the diameter of the pipe is correct for the cams available from the Factory. The Gold Star testing is a good place to get information on the various straight pipe and megaphone sizes.</p><p></p><p>David</p></blockquote><p></p>
[QUOTE="davidd, post: 130856, member: 1177"] The first photo in post 62 shows a weld that looks very hot, but when you look at the second photo you can see what went wrong. The weld was done with no back purge of argon. A weld that has no back purge tends to run hot and it concaves. If you look in the pipe you can see all of the "sugaring" you get when you do not purge the inside of the pipe with argon. If you back purge, then the weld on the inside should be smooth and silver. As Glen says, the diameter of the pipe is correct for the cams available from the Factory. The Gold Star testing is a good place to get information on the various straight pipe and megaphone sizes. David [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Norvin - Exhaust System
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