I have a 1956 3100 with a 235. It was running well until one evening when it suddenly started running really rough. Pushing the accelerator would provide no power, and nearly stall it out. It sounded like carb/ignition stuff. So I was able to cajole it into my garage. I rebuilt the carb, replaced points,plugs,wires,condenser,distr cap, retuned it and it ran like a champ for several weeks!
Until last Wed. The same issue. Stalled out, couldn't get it started, or if I somehow managed to start it it ran real rough until it stalled out. So I towed it back home. I checked spark off of the coil and it looked weak (orange and intermittent). I checked coil output and it was weak (I can't remember which reading) so I replaced the coil, and the condensor again just for kicks. The spark was still orange, but steady. But it still won't even start. I did notice an unusual wear pattern on the new points (a little wear on the rear bottom contact) so I figure I will replace those 2 week old points this weekend.
I thought it might be dirty fuel so I checked the gas in the float chamber and the fuel looked clean. But I will install a fuel filter this weekend anyway.
I am still very new to this hobby and am learning by doing, and I would greatly appreciate other things that folks might suggest I check. This machine has run really well for many years. Thanks very much for any hints.
