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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Big Bore Comet
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<blockquote data-quote="Bill Thomas" data-source="post: 171261" data-attributes="member: 485"><p>Hello Tom, The Mk2 is a strange beast, Depending on the slow running jet,</p><p>I found the slow running screw affects much higher up the rev range than other carbs,</p><p>Sounds like you are running too weak ?,</p><p>Dangerous with a Vincent ?,</p><p>Maybe richen it up with the slow running screw ?, Make a note of what it is now, Before playing !,</p><p>Or the slide is too big a cutaway ?,,</p><p>Most of our running is on the slide ?, My Twin does 80 mph on 1/4 throttle, Once up to speed,</p><p>I can't remember if I put a 30 slow running jet in there ?.</p><p></p><p>On one of mine , The hole in the front was too small, Can effect things, </p><p>If you undo the intake part, 2 screws, Under there is a hole that is important ?.</p><p></p><p>Maybe mine is too rich , Because I have to take the choke off almost as soon as I start from cold.</p><p></p><p>I would think 30 mm is OK with a standard engine,</p><p>As I said the chart is for the size of carb' , Not make and model ,</p><p></p><p>Some people have told me to use a 105 needle jet !!, Can't see how that would work on mine,</p><p>Mine goes well.</p><p></p><p>I can just get the choke to stay open half way, Mine is lever type choke,</p><p>But that is sometimes for a warm start, And for mine just on the back carb',</p><p>As an old mechanic, To put choke on when warm is wrong, But with the petrol we now have ,</p><p>I have to think different,</p><p>I am not as fit as I was, So some of it could be me, I still try to start it sitting on the bike,</p><p>I am tallish, And still running 9 to 1 pistons Mk2 Carbs, Rita electric ignition, I hate that !!, </p><p>If it ever packs up , I have a "D" Distributor for it,</p><p>McDougleator Alternator.</p><p>Good Luck, Bill.</p></blockquote><p></p>
[QUOTE="Bill Thomas, post: 171261, member: 485"] Hello Tom, The Mk2 is a strange beast, Depending on the slow running jet, I found the slow running screw affects much higher up the rev range than other carbs, Sounds like you are running too weak ?, Dangerous with a Vincent ?, Maybe richen it up with the slow running screw ?, Make a note of what it is now, Before playing !, Or the slide is too big a cutaway ?,, Most of our running is on the slide ?, My Twin does 80 mph on 1/4 throttle, Once up to speed, I can't remember if I put a 30 slow running jet in there ?. On one of mine , The hole in the front was too small, Can effect things, If you undo the intake part, 2 screws, Under there is a hole that is important ?. Maybe mine is too rich , Because I have to take the choke off almost as soon as I start from cold. I would think 30 mm is OK with a standard engine, As I said the chart is for the size of carb' , Not make and model , Some people have told me to use a 105 needle jet !!, Can't see how that would work on mine, Mine goes well. I can just get the choke to stay open half way, Mine is lever type choke, But that is sometimes for a warm start, And for mine just on the back carb', As an old mechanic, To put choke on when warm is wrong, But with the petrol we now have , I have to think different, I am not as fit as I was, So some of it could be me, I still try to start it sitting on the bike, I am tallish, And still running 9 to 1 pistons Mk2 Carbs, Rita electric ignition, I hate that !!, If it ever packs up , I have a "D" Distributor for it, McDougleator Alternator. Good Luck, Bill. [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Big Bore Comet
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