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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
siting of valve collar ET35 on the valve stem
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<blockquote data-quote="davidd" data-source="post: 109303" data-attributes="member: 1177"><p>The ET35 has a 45 degree bevel on the bottom that matches the 45 degree bevel on the valve stem. The bevel on the valve stem starts at the 3/8" diameter that is running inside the guide and ends at the 5/16" diameter that runs to the top of the valve with a slight exception. The exception is that there is an extra thou diameter right where the 5/16" diameter starts, but it only goes as high as the thickness of the ET35 (.213" to .230" or so). It is there to hold the ET35 in place during assembly. It can be taken down to 5/16", but it is usually not so different that the ET35 is not seating properly.</p><p></p><p>Based on your description it sounds like you are not using the G&S stock valve. I would be concerned that the shoulder for the ET35 might not be be the correct height, which is about 2.457" from the bottom of a new G&S valve. Also, if you have not bought the ET35 from a good supplier, they tend to vary in height quite a bit. This would only be a problem if the shoulder is also a little high. You might have a cumulative error creeping in.</p><p></p><p>I measure the valves with a height gauge.</p><p></p><p>David</p></blockquote><p></p>
[QUOTE="davidd, post: 109303, member: 1177"] The ET35 has a 45 degree bevel on the bottom that matches the 45 degree bevel on the valve stem. The bevel on the valve stem starts at the 3/8" diameter that is running inside the guide and ends at the 5/16" diameter that runs to the top of the valve with a slight exception. The exception is that there is an extra thou diameter right where the 5/16" diameter starts, but it only goes as high as the thickness of the ET35 (.213" to .230" or so). It is there to hold the ET35 in place during assembly. It can be taken down to 5/16", but it is usually not so different that the ET35 is not seating properly. Based on your description it sounds like you are not using the G&S stock valve. I would be concerned that the shoulder for the ET35 might not be be the correct height, which is about 2.457" from the bottom of a new G&S valve. Also, if you have not bought the ET35 from a good supplier, they tend to vary in height quite a bit. This would only be a problem if the shoulder is also a little high. You might have a cumulative error creeping in. I measure the valves with a height gauge. David [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
siting of valve collar ET35 on the valve stem
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