This happened to a couple members at different times in the past...it turned out that outside the normal stuff you have done, they screwed up one little thing that caused the ok at lower gear situation/ bad in 4th...
When installing the points, they put the spring arm part on the wrong side and it didnt give enough pressure on the points to work right...ok at lower speeds but faster and higher gear, no good...worth a look in there to see...
brute4c
Lord send your Holy Ghost into our hearts and make the desire of our hearts Your Will.
Pro-choice, that's a LIE, babies don't choose to die!!