I recently got my project bike running, an '81 SH. Seems to be running great but there is a 'tapping' noise coming from the vacuum advance/ pick up coil assembly. I can put my finger on the assembly and stop the tapping (sounds like it's 'bottoming out'). Since there is no way to adjust the timing (and it doesn't have a 'timing module') would it help to try installing a module from an earlier model (assuming it would fit)? I replaced the vacuum line, no change. Just seems to be too much travel of the vacuum advance unit/ pick up assembly.
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