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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Rapide carburation
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<blockquote data-quote="Vic Youel" data-source="post: 16925" data-attributes="member: 87"><p>Hi Earnie,</p><p></p><p>Your pictures of the different “Mixing Chamber Union Nuts (MCUN)” got me thinking. I have a similar selection of bits in my carb spares box.. I have short and long types for both the 276 and larger diameter 289 series of bodies and an extra long type too for the 276 just like your ones.</p><p></p><p>Looking in my various catalogues:</p><p></p><p>My old Amal data lists a type 6/062 MCUN for the vast majority of the many 276 or earlier 76 variants including the ones used on B and C Rapides. There are two other types listed (6/210 and 6/033) which are used on a few of the 276 types of carbs. The Latest Burlen catalogue lists the 6/033 as a short one and the 6/062 as a long one.</p><p></p><p>My old Amal data lists the 29/078 MCUN for the Shadow/Comet 289 series. Similarly the Burlen Amal catalogue confirms this part number.</p><p></p><p>Turning to P B Bickerstaffs superb reference only one type of MCUN is featured which seems to be the long one.</p><p></p><p>I have concluded that the middle one of your picture is the correct type of MCUN for Shadows, Rapides and Comets…..ie the long one as described by Burlen and that is what I have also fitted to my Rapide and Comet. Type 6/062 for Rapides and 29/078 for Comets and Shadows.</p><p></p><p>Hope this helps……incidentally I had never noticed that the bottom bolt is occasionally stamped with an “M” and has two large ¼ inch diameter holes as opposed to four 1/16 inch holes on the standard one. Burlen list both types.</p><p></p><p>Hope this is helpful</p><p></p><p>Vic</p></blockquote><p></p>
[QUOTE="Vic Youel, post: 16925, member: 87"] Hi Earnie, Your pictures of the different “Mixing Chamber Union Nuts (MCUN)” got me thinking. I have a similar selection of bits in my carb spares box.. I have short and long types for both the 276 and larger diameter 289 series of bodies and an extra long type too for the 276 just like your ones. Looking in my various catalogues: My old Amal data lists a type 6/062 MCUN for the vast majority of the many 276 or earlier 76 variants including the ones used on B and C Rapides. There are two other types listed (6/210 and 6/033) which are used on a few of the 276 types of carbs. The Latest Burlen catalogue lists the 6/033 as a short one and the 6/062 as a long one. My old Amal data lists the 29/078 MCUN for the Shadow/Comet 289 series. Similarly the Burlen Amal catalogue confirms this part number. Turning to P B Bickerstaffs superb reference only one type of MCUN is featured which seems to be the long one. I have concluded that the middle one of your picture is the correct type of MCUN for Shadows, Rapides and Comets…..ie the long one as described by Burlen and that is what I have also fitted to my Rapide and Comet. Type 6/062 for Rapides and 29/078 for Comets and Shadows. Hope this helps……incidentally I had never noticed that the bottom bolt is occasionally stamped with an “M” and has two large ¼ inch diameter holes as opposed to four 1/16 inch holes on the standard one. Burlen list both types. Hope this is helpful Vic [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Rapide carburation
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