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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Amal Carburettors Dripping Badly
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<blockquote data-quote="oexing" data-source="post: 154657" data-attributes="member: 1493"><p>The big fibre washer seal is pretty hard for coping with less than perfect components on an Amal. An easy mod is to reduce the o.d. of the washer for a thin o-ring. The washer is 1.1mm thick so a 1.5mm o-ring is great for easier sealing. You don´t want to heave on the big nut for getting the joint fuel-tight when the carb is half a century old. So the fibre sets the float position and the oring seals the lot. </p><p> Another overlooked leak is above the big nut in the slot for the orientation pin. On some jet blocks there are two useless drillings , one is open to air and can leak while parking. The fuel level is higher than the position of the drillings so there. The hole could be pluged with solder or a bit of o-ring or so. </p><p>But even then, fuel can leak down along the jetblock from pilot system drillings and creep up the big thread and wet the carb at least. So a smear of Hylomar on the flange of the jetblock will seal it to the carb body, the o-ring around the fibre washer seals from below - hopefully. </p><p> The float needle taper can be restored by twisting it between fingers with fine abrasive paper when a ridge has formed. So then a very fine grinding paste will lap the lot in the valve seat for a good sealing.</p><p></p><p> Vic</p><p></p><p></p><p>[ATTACH=full]48629[/ATTACH]</p><p></p><p></p><p>[ATTACH=full]48628[/ATTACH]</p></blockquote><p></p>
[QUOTE="oexing, post: 154657, member: 1493"] The big fibre washer seal is pretty hard for coping with less than perfect components on an Amal. An easy mod is to reduce the o.d. of the washer for a thin o-ring. The washer is 1.1mm thick so a 1.5mm o-ring is great for easier sealing. You don´t want to heave on the big nut for getting the joint fuel-tight when the carb is half a century old. So the fibre sets the float position and the oring seals the lot. Another overlooked leak is above the big nut in the slot for the orientation pin. On some jet blocks there are two useless drillings , one is open to air and can leak while parking. The fuel level is higher than the position of the drillings so there. The hole could be pluged with solder or a bit of o-ring or so. But even then, fuel can leak down along the jetblock from pilot system drillings and creep up the big thread and wet the carb at least. So a smear of Hylomar on the flange of the jetblock will seal it to the carb body, the o-ring around the fibre washer seals from below - hopefully. The float needle taper can be restored by twisting it between fingers with fine abrasive paper when a ridge has formed. So then a very fine grinding paste will lap the lot in the valve seat for a good sealing. Vic [ATTACH type="full"]48629[/ATTACH] [ATTACH type="full"]48628[/ATTACH] [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Amal Carburettors Dripping Badly
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