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Mike, I would say the tach would be the most sensitive device to noise/ bad ground on the bike and would be the first to show an issue. It's a possibility. I guess it could still be in the stator. Maybe also try a spare main voltage regulator for "clean" power. Maybe one of the diodes in the bridge is acting odd and not quite rectifying.
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Tach is counting unrectified pulses.-Mike
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'79 XS1100SF 20k miles
'80 XS1100SG 44k miles
'81 XS1100H Venturer 35k miles
'79 XS750SF 17k miles
'85 Honda V65 Magna ~7k miles
'84 Honda V65 Magna 48k miles (parts bike)
'86 Yamaha VMAX 9k miles
Previous: '68 Motoguzzi 600cc + '79 XS750SF 22k miles +'84 Honda V65Comment
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You DO NEED good grounds for everything to work properly. Electrical problems on older bikes are almost always a ground issue. Go through, clean every ground wire and screw on the bike and see if that helps.Ray Matteis
KE6NHG
XS1100 E '78 (winter project)
XS1100 SF Bob Jones worked on it!Comment
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Yeah, I had thought that as well. I'm imagining the battery adds stability.-Mike
_________
'79 XS1100SF 20k miles
'80 XS1100SG 44k miles
'81 XS1100H Venturer 35k miles
'79 XS750SF 17k miles
'85 Honda V65 Magna ~7k miles
'84 Honda V65 Magna 48k miles (parts bike)
'86 Yamaha VMAX 9k miles
Previous: '68 Motoguzzi 600cc + '79 XS750SF 22k miles +'84 Honda V65Comment
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It absolutely adds stability. Positive and negative are the reference points of the signal wave. If they are off or unstable (changing) the coordinates will be off.
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