When I switch the ignition over to Run (magneto) at tick-over on my Speed20 SC a rumbling noise comes from somewhere yet to be located. Increase the revs to 1,000 rpm or so and it disappears, switch to coil it also silences. The car runs fine in either mode but the rumbling does not bode well. Big fat sparks from the mag, mag bearings seem fine, everything obvious in good condition Any ideas, Off to italy next week and don't want her to embarrass herself Posted by shaun matthews 24/09/2012 20:49:25
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