Ha-le-lu-ya (sp?) I got it going!!! After all, it did start before I paid for. The funny part is that, when I opened the engine, I FOUND 1 of the 6 plugs was not connected, and ALL the plugs were "finger loose". Not even all the way in. Despite of that, it started before. Battery has got to be replaced, no question about that. But, not knowing how to choke a cold engine, and not knowing how to pre-set the throttle such as half way or 3/4, the motor was sluggish to turn, even with a new battery. And get pretty hot after quite a few crankings -- I decided the weakness is in the starting motor.
So, after I posted the thread, and lost some sleep, I decided to play a little trick with the batteries.
First, I parallel the new one and the old one, (I kept the old one), and the battery trickle charger, to get more cranking power. It helped a bit, still sounds like - wow-woow-wooow... THEN (do not do this at home unless you have enough electrical background) I series 2 batteries, providing 24VDC for starting motor and 12 for other part of boat circuits. It cranked better! After a few rest and try, including spraying carburator cleaning liquid, and juggling with throttle, and choking, it finally started, and run and run. Ha-le-lu-ya.
Thank you guys for calling my attention to the carburator rebuilding, which I don't know much,
I guess I will have to, quickly. I didn't hear the choke clicking, rebuilding will certainly help.
I need to rest for today. That was enough excitement.
Shinn.