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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Concentric Mk1's on a twin - problems!
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<blockquote data-quote="b.l.hayward@tesco.net" data-source="post: 27126" data-attributes="member: 865"><p><span style="font-size: 12px"><span style="color: #000000"><span style="font-family: 'Times New Roman'">Many thanks for all the inputs – especially Howard with the link to the Bushman Concentric problems – fascinating reading! Anyway, have had the rear cylinder carb to pieces again and took the trouble to poke the idle fuel way with thin wire followed by a blast of WD40 and then compressed air. Nothing I could <u>see</u> came out - and I then checked the float level based on info in the link. Result was that it looked a bit below where it should be (ie weak) so I heated the float bowl in boiling water and tried to tap the brass bush with the needle seat a bit lower. No joy, unfortunately, because the brass bush was already in as far as it would go – it didn’t budge! Put the carb back together and started – joy! Almost no spitting back and ran much better – perhaps some of the tank sealer had been dissolved by the ethanol in the petrol and a sticky blob had caused a blockage? Anyway, it’s 90% better than it was and I am thinking that maybe the fact that I have a 30mm carb/stub bolted to 34mm inlet tract could be part of the problem? Each time I have removed the carb there has been a little puddle of petrol in the inlet sitting in the step between the stub and the inlet tract. Might try to open the rear of the stub to 34mm ie it will then go from 30mm (carb) to 34mm (inlet tract). Any thoughts very welcome! PS if you are wondering why the head seems non-std I bought the entire top-end from Ted Croft after somebody had blown up a Norvin - looks as though it may have been breathed on and I didn't realise it!</span></span></span></p></blockquote><p></p>
[QUOTE="b.l.hayward@tesco.net, post: 27126, member: 865"] [SIZE=3][COLOR=#000000][FONT=Times New Roman]Many thanks for all the inputs – especially Howard with the link to the Bushman Concentric problems – fascinating reading! Anyway, have had the rear cylinder carb to pieces again and took the trouble to poke the idle fuel way with thin wire followed by a blast of WD40 and then compressed air. Nothing I could [U]see[/U] came out - and I then checked the float level based on info in the link. Result was that it looked a bit below where it should be (ie weak) so I heated the float bowl in boiling water and tried to tap the brass bush with the needle seat a bit lower. No joy, unfortunately, because the brass bush was already in as far as it would go – it didn’t budge! Put the carb back together and started – joy! Almost no spitting back and ran much better – perhaps some of the tank sealer had been dissolved by the ethanol in the petrol and a sticky blob had caused a blockage? Anyway, it’s 90% better than it was and I am thinking that maybe the fact that I have a 30mm carb/stub bolted to 34mm inlet tract could be part of the problem? Each time I have removed the carb there has been a little puddle of petrol in the inlet sitting in the step between the stub and the inlet tract. Might try to open the rear of the stub to 34mm ie it will then go from 30mm (carb) to 34mm (inlet tract). Any thoughts very welcome! PS if you are wondering why the head seems non-std I bought the entire top-end from Ted Croft after somebody had blown up a Norvin - looks as though it may have been breathed on and I didn't realise it![/FONT][/COLOR][/SIZE] [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Concentric Mk1's on a twin - problems!
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