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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
New (?) Comet Engine Noise
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<blockquote data-quote="Big Sid" data-source="post: 40263" data-attributes="member: 2781"><p>Comets always run wider throttle openings and so higher cylinder pressure than twins , thus their pistons show more discolored oil residue especially on the underside and carbon build up is to be expected . They need a richer mixture to live under the greater heat which explains the carbon build up . Rich is cool but loses a bit of power , lean creates greater power from the higher pressure thus speed , but is waiting for the excuse to cause problems , detonation , piston skirt damage , erosion of the crown , eventual melt down If ignored . At that point she will burn a hole through the crown blowing molten alloy down into the bottom end as she cries enough . Stay on the rich side , the plug porcelan coloring a chocolate brown , not a light tan and certainly not nearer white . These light colors are acceptable in a modern water cooled motor but are death to air cooled ones . </p><p> Matt's Shadow is still on the original carbs , running beautifully , with 220 mains . It is fitted with a Triumph original Burgess straight through Glas PAC muffler so needs that larger jet . Give a motor what it wants and needs , not what the book says or you think is correct . The motor IS BOSS . Sid . </p><p></p><p></p><p>Sent from my iPad using Tapatalk</p></blockquote><p></p>
[QUOTE="Big Sid, post: 40263, member: 2781"] Comets always run wider throttle openings and so higher cylinder pressure than twins , thus their pistons show more discolored oil residue especially on the underside and carbon build up is to be expected . They need a richer mixture to live under the greater heat which explains the carbon build up . Rich is cool but loses a bit of power , lean creates greater power from the higher pressure thus speed , but is waiting for the excuse to cause problems , detonation , piston skirt damage , erosion of the crown , eventual melt down If ignored . At that point she will burn a hole through the crown blowing molten alloy down into the bottom end as she cries enough . Stay on the rich side , the plug porcelan coloring a chocolate brown , not a light tan and certainly not nearer white . These light colors are acceptable in a modern water cooled motor but are death to air cooled ones . Matt's Shadow is still on the original carbs , running beautifully , with 220 mains . It is fitted with a Triumph original Burgess straight through Glas PAC muffler so needs that larger jet . Give a motor what it wants and needs , not what the book says or you think is correct . The motor IS BOSS . Sid . Sent from my iPad using Tapatalk [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
New (?) Comet Engine Noise
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