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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
big TT carbs
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<blockquote data-quote="Magnetoman" data-source="post: 54694" data-attributes="member: 2806"><p>Even though my TT is NOS, 60+ years of oxidation has made the jet block reluctant to come out of the body and I don't have the time to make a drift to gently force it out. However, like the later Monoblocs and Concentrics there's a brass choke tube in the jet block that protrudes ~1-2 mm into the air stream. If the bore were increased to 1-5/16" (i.e. by 1/16" in radius) the height of that choke tube would have to be cut down by 1/16" to keep the same amount of protrusion. </p><p> </p><p>I can't tell without disassembling it if on the TT the choke tube is pressed directly into the jet block or is in the end of the separate piece that mounts the needle jet and main jet. That separate piece itself screws into place in the jet block. Depending on how it is attached, it <em>might</em> be possible to make a 1/16" spacer to lower the position of the assembly, which in turn would lower the position of the choke tube if it indeed is part of that assembly. However, since in any case the carburetor would be modified on the lathe I can't see any particular advantage to lowering the choke tube that way even if it were possible.</p></blockquote><p></p>
[QUOTE="Magnetoman, post: 54694, member: 2806"] Even though my TT is NOS, 60+ years of oxidation has made the jet block reluctant to come out of the body and I don't have the time to make a drift to gently force it out. However, like the later Monoblocs and Concentrics there's a brass choke tube in the jet block that protrudes ~1-2 mm into the air stream. If the bore were increased to 1-5/16" (i.e. by 1/16" in radius) the height of that choke tube would have to be cut down by 1/16" to keep the same amount of protrusion. I can't tell without disassembling it if on the TT the choke tube is pressed directly into the jet block or is in the end of the separate piece that mounts the needle jet and main jet. That separate piece itself screws into place in the jet block. Depending on how it is attached, it [I]might[/I] be possible to make a 1/16" spacer to lower the position of the assembly, which in turn would lower the position of the choke tube if it indeed is part of that assembly. However, since in any case the carburetor would be modified on the lathe I can't see any particular advantage to lowering the choke tube that way even if it were possible. [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
big TT carbs
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