Randall Washington, aka "Randakk"
President and Chief Executive Rider
Chapel Hill, NC USA
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Return to main Tech Tips Index Emulsion Tube VariationsYou might consider this item: Randakk's GL1000 Carb Rebuild Video Emulsion tubes are perforated nozzles designed to pre-mix fuel and air for subsequent metering by the main fuel jets. Sometimes these are also called:
The "froth" created by emulsion tubes improves fuel atomization. In the GL1000, both the main and secondary main fuel jets employ emulsion tubes. Keep in mind that when a bike sits unused for any length of time, these emulsion tubes can get plugged with residues. This will seriously disrupt the air-fuel mixture. Each carb may be affected differently, so the symptoms can be a bit contradictory and elusive. Generally, the lack of air, will cause an over-rich condition on the affected carb(s). Depending on which holes are plugged, you can sometimes get weird, rpm-dependent problems. There are 2 variations for both the main and secondary main emulsion tubes used in the GL1000 range. These can be intermixed with bad results!
The main jet emulsion tube above is correct for 755A, 758A and 763A Carb codes ('75, '76 and '76 LTD US models). Notice that there are 5 cross-drilled holes.
The main jet emulsion tube above is correct for 764A, 769A and 771A Carb codes ('77, '78 and '79 US models). Notice that there are only 4 cross-drilled holes.
The secondary main jet emulsion tube above is correct for 755A, 758A and 763A Carb codes ('75, '76 and '76 LTD US models). Notice that there are 5 + 2 cross-drilled holes in a 1-piece brass tube.
2 photos above show the secondary main jet emulsion tube correct for 764A, 769A and 771A Carb codes ('77, '78 and '79 US models). Notice that there are 5 + 2 cross-drilled holes in a 2-piece design...brass tube + stainless "hat." Again, these emulsion tubes can be intermixed with bad results! A few aftermarket carb kits include main nozzles that are not 100% correct depending on specific carb code. Always install the correct emulsion tube for your carb code. Return to main Tech Tips Index Intellectual Property Notice: All material appearing in this website is the property of Randall Washington, and is protected under United States and international copyright laws. The photographs, text and other content may not be copied, reproduced, distributed, stored, or manipulated in any manner without the express written permission of Randall Washington. For more information on the use of material from this website, click here |
