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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
won't idle low=too much timing?
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<blockquote data-quote="Magnetoman" data-source="post: 48847" data-attributes="member: 2806"><p>That's true, but...</p><p></p><p>Most engines allow the thin machinist's ruler to be inserted fairly close to parallel with the direction of travel. Even if it is angled by 10 deg. the fact the piston only moves ~1/2" down from TDC means the tip of the ruler will not slip very far across the piston top so this error is fairly small for all but highly domed, high compression pistons in an engine where the spark plug hole is very near the side of the bore. Also, although I can't remember who wrote it,</p><p></p><p>someone pointed out that, especially with today's variable gasoline mixtures, the no. of deg. BTDC where the timing needs to be set isn't such a well defined number that setting it to better precision than this is called for anyway.</p></blockquote><p></p>
[QUOTE="Magnetoman, post: 48847, member: 2806"] That's true, but... Most engines allow the thin machinist's ruler to be inserted fairly close to parallel with the direction of travel. Even if it is angled by 10 deg. the fact the piston only moves ~1/2" down from TDC means the tip of the ruler will not slip very far across the piston top so this error is fairly small for all but highly domed, high compression pistons in an engine where the spark plug hole is very near the side of the bore. Also, although I can't remember who wrote it, someone pointed out that, especially with today's variable gasoline mixtures, the no. of deg. BTDC where the timing needs to be set isn't such a well defined number that setting it to better precision than this is called for anyway. [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
won't idle low=too much timing?
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