Home › Forum › Ask A Member › Johnson 5hp TD20 ignition timing facts & figures? › Re: Johnson 5hp TD20 ignition timing facts & figures?
I read that you fabricated a replacement for the long vertical linkage rod. Are you sure that the linkage is all assembled correctly. I had one TD-20 with two different linkage rod issues. The short rod had broken, and the PO brazed it back together in the wrong orientation by 180 degrees. The long rod had been disassembled and put back together with the spring on the wrong side of the stop. Having said that, you mentioned that you had a good runner as an example to go by, so that is a great help.
Going back to your original post, you mentioned that the compression is at about 65 PSI. That reading is on the low side and that motor may never idle well. I have a small collection of these TD-20’s, and the lowest compression of the really good runners is in the 72-73 PSI range cold and dry. When all is right with these motors, they will be able to idle just ‘two clicks’ up from all the way off with the ignition advance lever.
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