when I get it figured out I will post results.
I figured it out, the battery was not strong enough to keep cranking the engine over and it disengaged from the engine so the engine just pooped and popped until I ran jumper cables from my truck. After about 20 seconds of cranking the replacement motor fired up, smooth and quiet. The way the engine reacted to the low battery had me fooled, now it has a new lease on life
I think most of the previous posters mmissed your finding Compression: "140 lbs compression both sides"
A healthy 350 has 180-185 PSI on both side with less than 5% variation.
The FSM spec's below 150 PSI requires a rebuild
1970 CB 350 CAFE - Current Project on the bench,
1972 CB 350 K4 Red - Now a Happy Rider ! !
1972 CB 350 K4 Green (My Sons) DONE - YES !,
1st Bike 1970 SL 350 (Brought home in Parts - Trailer/Trunk/Back Seat - I miss that bike),
2nd - Bike Kawasaki 750
3rd - '73 XLCH 1000
the poor compression readings were due to my ignorance using the gauge, I figured out the problem and the motor runs great
thanks to the guys who chimed in. These forums are great tools along with being great reading