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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Amal Mk1 Premier Carb - Float Level
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<blockquote data-quote="Simon Dinsdale" data-source="post: 110853" data-attributes="member: 58"><p>I suspect the weight of a pre monoblock needle will not make any real difference. It is the total weight the fuel has to lift which is the needle and float combined and with the Mk1 concentric always using a plastic float then Amal have had to make the new float out of ethanol resistant plastic. I believe the new Mk1 floats are also not hollow, but more a honeycomb inside and so weigh more so to compensate the needle has to weigh less. The restricted area the float operates in a MK1 doesn't allow for different size (larger) float to get the same buoyancy with the modern fuel so its all a compromise.</p><p></p><p>The float chamber in a pre monoblock has a lot more room (height) so it is easier to use a "modern" plastic float which may be a different volume.</p><p></p><p>Simon</p></blockquote><p></p>
[QUOTE="Simon Dinsdale, post: 110853, member: 58"] I suspect the weight of a pre monoblock needle will not make any real difference. It is the total weight the fuel has to lift which is the needle and float combined and with the Mk1 concentric always using a plastic float then Amal have had to make the new float out of ethanol resistant plastic. I believe the new Mk1 floats are also not hollow, but more a honeycomb inside and so weigh more so to compensate the needle has to weigh less. The restricted area the float operates in a MK1 doesn't allow for different size (larger) float to get the same buoyancy with the modern fuel so its all a compromise. The float chamber in a pre monoblock has a lot more room (height) so it is easier to use a "modern" plastic float which may be a different volume. Simon [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Amal Mk1 Premier Carb - Float Level
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