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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Terry Prince 600cc conversion
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<blockquote data-quote="Black Flash" data-source="post: 52815" data-attributes="member: 433"><p>Hello Kevin,</p><p>i have the same topend on my black flash (hence my name here). I am using a 36 mm Mikuni VM carb on that engine and have a TP race cam in it. well the one he made 10 years ago. I somewhere have a diagram of the cam.</p><p>I had to experiment with the exhaust a lot cause it the exhaust noise which stopped me from getting the bike road registered. It was first fitted with an Armours Goldstar silencer > 121 db. the MOT guy is doing classic racing on a G50 but when he heard the Comet he went pale in his face.</p><p>then i tried all sorts of silencers i could get hold of for trial runs in the fields. I finally found a noname readily available one from a dealer on the internet for 50 GBP. which sounded and felt ok.</p><p>It also changed the engine characteristics and made it much more pleasing. Before the engine a was real Gold Star RTT2 sort of . madly slipping the clutch , if the revs dropped the engine would die, now it is almost like a standard cam, but with MUCH more grunt than standard Comet.</p><p>I went for a Norton Commando N type gearbox, a NA will do as well, just needs a bit more of filing to reduce the width of the g/b lugs.</p><p>the clutch I am using is a Commando one with newer friction discs run dry (I am on a belt). due to the horrible engine characteristics at the beginning of my trial period a managed to blue the steel discs just from take offs.</p><p></p><p>I am still fiddling with the bike now and I won't take it on a dyno before it has done at least 2000 mls, so I can only guess.</p><p>but from the way the bike accelerates I am sure it must be over 40, more like 45 bhp. But that is just guesswork.</p><p>Hopefully a dynorun will tell that year. But just standing next to the bike and listening to the tick over, which goes bang, bang, bang…. compared to a more likely puff, puff, puff on a standard Comettells you all the difference and dare I say it..give you goosepimbles.</p><p>Oh I am also using twinspark ignition.</p><p></p><p>cheers</p><p>bernd</p></blockquote><p></p>
[QUOTE="Black Flash, post: 52815, member: 433"] Hello Kevin, i have the same topend on my black flash (hence my name here). I am using a 36 mm Mikuni VM carb on that engine and have a TP race cam in it. well the one he made 10 years ago. I somewhere have a diagram of the cam. I had to experiment with the exhaust a lot cause it the exhaust noise which stopped me from getting the bike road registered. It was first fitted with an Armours Goldstar silencer > 121 db. the MOT guy is doing classic racing on a G50 but when he heard the Comet he went pale in his face. then i tried all sorts of silencers i could get hold of for trial runs in the fields. I finally found a noname readily available one from a dealer on the internet for 50 GBP. which sounded and felt ok. It also changed the engine characteristics and made it much more pleasing. Before the engine a was real Gold Star RTT2 sort of . madly slipping the clutch , if the revs dropped the engine would die, now it is almost like a standard cam, but with MUCH more grunt than standard Comet. I went for a Norton Commando N type gearbox, a NA will do as well, just needs a bit more of filing to reduce the width of the g/b lugs. the clutch I am using is a Commando one with newer friction discs run dry (I am on a belt). due to the horrible engine characteristics at the beginning of my trial period a managed to blue the steel discs just from take offs. I am still fiddling with the bike now and I won't take it on a dyno before it has done at least 2000 mls, so I can only guess. but from the way the bike accelerates I am sure it must be over 40, more like 45 bhp. But that is just guesswork. Hopefully a dynorun will tell that year. But just standing next to the bike and listening to the tick over, which goes bang, bang, bang…. compared to a more likely puff, puff, puff on a standard Comettells you all the difference and dare I say it..give you goosepimbles. Oh I am also using twinspark ignition. cheers bernd [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Terry Prince 600cc conversion
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