So...on to the next evolution.
It did run kind of roughly. Not sure how good the sound is in the video. I would describe it as a "miss." The longest period it ran without dying was probably 4-5 minutes. It would smooth out and sound pretty good for a few seconds and then go back to stumbling.
And when it died...it usually did so with sort of a "backfire" through the carb. Not a loud pop or bang, just a good sharp "puff" sound.
For background, before I started, all of the following were done:
* Timing set with flywheel mark and distributor
* Verified firing order
* Pulled valve cover to see that valves all moved up and down and "seemed" to have some clearance room to close fully. (you can hear some valve noise in the video, I had not done a proper adjustment)
* Complete fuel system rebuild: Tank, lines, filters, etc.
* Carb kit
* Plugs, wires, points, cap, rotor, coil, etc.
* Idle mixture screw set at 1.5 turns out
So, here are some ideas I have on potential causes and fixes...would like some expert opinion on which ones to try first or in which order. Based on what little you can hear in the video and the symptoms I describe.
* Adjust mixture screw another out another half to full turn.
* I'm fairly certain there are exhaust leaks - how much might these contribute to symptoms, and what's the best way to troubleshoot
* Compression test - I didn't do one thinking a cold test on an engine that sat for many years might not be accurate.
* A more scientific cold valve adjustment.
* Check vacuum advance function (need help with this one)
* Verify spark at each cylinder
* Some sort of carb function check (again, not sure where to begin).
* The vacuum leak check with propane or starting fluid
Last edited by JW51; 01/20/2015 8:38 PM.
