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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Leak down test
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<blockquote data-quote="Bill Cannon" data-source="post: 126445" data-attributes="member: 152"><p>Well the bike is back together. Thanks for everyone's advice.</p><p>I got my mini grinder out and put some grooves around the inlet guides to stop oil pooling. I found nothing wrong within the engine.</p><p>I did find that the decompression lever was binding slightly on it's pivot and had minimal cable clearance so I fixed these.</p><p>Refilled the tank and added BMW/Shell fuel additive as it's easily and cheaply available for me!</p><p></p><p>Started up and the problem was exactly the same, erratic running on the rear cylinder.</p><p>Counter-intuitively I richened the rear carb by screwing the needle out and things improved, after two turns the rear seemed to be pulling cleanly and was sucking the palm of my hand nicely. So pretty sure it's a fuel problem of some description.</p><p></p><p>I'm now wondering if it's wear in the throttle slides letting too much air through.</p><p>With carbs that are now at least 50 years old do I try to recondition as I like them when they are working or change to Mikunis or something else?</p><p></p><p>Cheers Bill</p></blockquote><p></p>
[QUOTE="Bill Cannon, post: 126445, member: 152"] Well the bike is back together. Thanks for everyone's advice. I got my mini grinder out and put some grooves around the inlet guides to stop oil pooling. I found nothing wrong within the engine. I did find that the decompression lever was binding slightly on it's pivot and had minimal cable clearance so I fixed these. Refilled the tank and added BMW/Shell fuel additive as it's easily and cheaply available for me! Started up and the problem was exactly the same, erratic running on the rear cylinder. Counter-intuitively I richened the rear carb by screwing the needle out and things improved, after two turns the rear seemed to be pulling cleanly and was sucking the palm of my hand nicely. So pretty sure it's a fuel problem of some description. I'm now wondering if it's wear in the throttle slides letting too much air through. With carbs that are now at least 50 years old do I try to recondition as I like them when they are working or change to Mikunis or something else? Cheers Bill [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Leak down test
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