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Um, well, fixing spark scatter, let’s see.
Back in the old days, you had your made in Western Germany Bosch unit that, for the most part, didn’t scatter cause all the mechanical weights and springs and widgets that controlled the advance were made by Western Germans who worried that if something they made didn’t work right it reflected badly on Western Germany and they couldn’t go home at the end of the workday with that on their shoulders.
If you still have one of those original units and, after a few hundred thousand miles, it no longer properly advances spark, you can have it rebuilt (at considerable expense) and it will once again work as new because, well, Western Germany.
But you probably don’t. Ninety-nine point nine per cent of modern dizzies made to look like the old Bosch units do only that. They are made far from the shores of Western Germany, and most of the bits inside that are supposed to be advancing the spark are fabbed up from odd scraps and waste material that would usually end up on the floor of a factory in Western Germany.
For most of us, the most cost effective fix is to toss the old dizzy and find a new one that works better. There are a few reliable models out there, and some of us have found the CB Performance Magnaspark II to be one of these.
I am not a professional mechanic, or even much of an amateur, but was able to do this swap myself with great success. My spark scatter disappeared, just like that.
But do the timing light test first. This may not be the problem, but it’s an easy and cheap thing to check, and will leave you with information it’s important to have before proceeding.
Let us know how it goes.