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Miglia Builds and discussion Miglia bodied builds

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Old 18th November 2017, 06:21
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froggyman froggyman is offline
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or vacuum advance and retard elbow.
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Old 18th November 2017, 07:57
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As Molleur says, it's a plastic tube that varies the ignition timing depending on the vacuum at the inlet manifold.

Throttle(s) closed = big vacuum and little ignition advance so it doesn't stall as it slows to an idle. Throttle(s) open = less vacuum and lots of ignition advance so the spark fully ignites the fuel/air mix before the firing stroke piston has travelled back down the bore at higher revs.

Cheap as anything and available from most motor factors so not worth trying to repair.
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Old 19th November 2017, 11:31
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molleur, froggyman and Mister Towed - thank you very much for your help. Mister T thank you for the explanation, I understand the system a bit better now. Thanks for the links to order the parts too.

Mister T I hope your Speedster build is going well - did you started the build thread already? I've enjoyed your Sammio thread a lot, so I hope to read about building the Speedster too.

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