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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Starts, runs then slowly "chokes up"
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<blockquote data-quote="macvette" data-source="post: 110222" data-attributes="member: 262"><p>I agree that a new conenser would be the simplest way forward to see if it fixes the problem. I have a series D Rapide with monoblocs.376. </p><p>689 is a right hand version of a 389 fitted to BSA LIGHTNINGS. Series D s were fitted with 376 monobloc which are 1&1/16, 389 are 1&1/8 and were fitted to D black shadows and Black knights. </p><p>Looking at the Burlen web site, 689 s were main jetted with 270 mains which is the upper end for a series D shadow.</p><p>So even if the condenser corrects the issue, your carbs need a good looking into. If the intakes(carb mountings) havent been blended to match the carb diameter there will be a step at the rear of the carb and possibly the head which can cause fuel drop out and pooling of fuel.</p></blockquote><p></p>
[QUOTE="macvette, post: 110222, member: 262"] I agree that a new conenser would be the simplest way forward to see if it fixes the problem. I have a series D Rapide with monoblocs.376. 689 is a right hand version of a 389 fitted to BSA LIGHTNINGS. Series D s were fitted with 376 monobloc which are 1&1/16, 389 are 1&1/8 and were fitted to D black shadows and Black knights. Looking at the Burlen web site, 689 s were main jetted with 270 mains which is the upper end for a series D shadow. So even if the condenser corrects the issue, your carbs need a good looking into. If the intakes(carb mountings) havent been blended to match the carb diameter there will be a step at the rear of the carb and possibly the head which can cause fuel drop out and pooling of fuel. [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Starts, runs then slowly "chokes up"
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