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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Starting Vincent Life with a Backfire!
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<blockquote data-quote="BigEd" data-source="post: 48441" data-attributes="member: 161"><p>You are obviously no novice but here are a few more things to throw into the mix:</p><p></p><p>Do not assume that the spare spark plugs are OK. If you remove a plug and check for a spark (away from any fuel) this will confirm some high tension output but does not necessarily mean it will fire under compression. </p><p>Try eliminating one thing at a time, e.g. use a <u>new</u> plug or one taken from a definitely running engine, etc.</p><p></p><p>Your mention of a "black box" suggests electronic ignition of some sort but not the make. The ignition timing is usually adjustable by moving a pick/back plate. This may be accessed through a hole in the timing cover, inside a dummy magneto or some proprietary unit housing bearings and the pick up and back plate.</p><p>Note that if you ignition is Boyer based some of these units are quite voltage critical. If the battery voltage is too low the electronics revert to full advance at kick starting speed. If your battery is not well charged you may get a spark but it will be too advanced and prone to back fire.</p><p></p><p>Good luck. I'm sure that your perseverance and tenacity will get you there.</p></blockquote><p></p>
[QUOTE="BigEd, post: 48441, member: 161"] You are obviously no novice but here are a few more things to throw into the mix: Do not assume that the spare spark plugs are OK. If you remove a plug and check for a spark (away from any fuel) this will confirm some high tension output but does not necessarily mean it will fire under compression. Try eliminating one thing at a time, e.g. use a [U]new[/U] plug or one taken from a definitely running engine, etc. Your mention of a "black box" suggests electronic ignition of some sort but not the make. The ignition timing is usually adjustable by moving a pick/back plate. This may be accessed through a hole in the timing cover, inside a dummy magneto or some proprietary unit housing bearings and the pick up and back plate. Note that if you ignition is Boyer based some of these units are quite voltage critical. If the battery voltage is too low the electronics revert to full advance at kick starting speed. If your battery is not well charged you may get a spark but it will be too advanced and prone to back fire. Good luck. I'm sure that your perseverance and tenacity will get you there. [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Starting Vincent Life with a Backfire!
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