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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Comet Valve Timing
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<blockquote data-quote="Matty" data-source="post: 26902" data-attributes="member: 1339"><p>Thanks - I realise that there is a "vernier" adjustment for valve timing by moving the key in the half-time pinion, but if a change of 15degrees does not seem to make a difference from the old factory settings it does not seem worth playing around with 3degree changes.</p><p></p><p>However I suppose that if a move of 15 degrees does not seem to make a change, perhaps the "sweet spot " is half way between and an error either way of this optimum setting degrades the performance by an equal amount.</p><p></p><p>Mine seems to have worked OK on the old factory settings for my purposes for 55years and it did around 80mpg on the last trip to the Isle of Man, so I think I will live with it as it is - maybe all I need is a lot of time and a dyno to find the real answer!!</p><p></p><p>Matty</p></blockquote><p></p>
[QUOTE="Matty, post: 26902, member: 1339"] Thanks - I realise that there is a "vernier" adjustment for valve timing by moving the key in the half-time pinion, but if a change of 15degrees does not seem to make a difference from the old factory settings it does not seem worth playing around with 3degree changes. However I suppose that if a move of 15 degrees does not seem to make a change, perhaps the "sweet spot " is half way between and an error either way of this optimum setting degrades the performance by an equal amount. Mine seems to have worked OK on the old factory settings for my purposes for 55years and it did around 80mpg on the last trip to the Isle of Man, so I think I will live with it as it is - maybe all I need is a lot of time and a dyno to find the real answer!! Matty [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Comet Valve Timing
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