Yeah, I have an 81 2pg same engine as you. I have spent hours researching the same no power etc on the web. Just joined here today. It seems most 80s vintages are all experiencing the the malady..hmmm.
With the 12v electrical system and a lot of rattle and dirt.. any loose wire , corrosion, or just plain dust dirt on any connection anywhere in the system will cause trouble. However, it seems the ignitor and pulsar are the biggist part failure in this age group. Of course in front of these are the coil and voltage regulator. I have not found the test proceedure to for testing the volt reg. or the ignitor or the pulsar unit with an VOM. Can anyone post these test parameters please ?
yEAH, just got it and in the week I have serviced the fuel system and a new spark plug wire. Ran like new for 3 days. Now back to the same no accel or power and the plug gets wet but lots of spark but no advance now with the accellerator pedal movement. When I got it goin the pedal movement for sure speeded up the spark as I have an inline spark viewer tool.
I also have to go bak over the fuel system and recheck for vacume and other leaks in fuel pump, carb, and crankcase.
Will keep up with this forum. Mike James Boulder Colorado you may also email [email protected]