The ignition timing on a twin has actually got to be out quite a bit for them to kick back.......generally if the mag is out by 180 deg or if the timing has been set to full advance with the ATD still in its retarded position.......
Thank you Greg for the checks I need to do. When the carbs are trickled so the float chamber is full they continue to fill and leak until the engine starts so do I assume the float levels are too high?
The other question concerns the measurement of the pilot jets in the jet blocks - how is the measurement taken?
An old chestnut on here many times, with the original carbs on spigots you can rotate them slightly out of vertical to alter float level
(On this venerable forum the search box top right is your friend. its very possible its been asked before)
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