Thanks for all the replies!! If heat is a problem with chrome, I certainly won't get a chrome one. I live in Southern CA and it is sunny and warm most of the year. In the summer it can get over 100 degrees in my town. Heat is a huge concern for me, I want an engine that runs as cool as possible! I guess chrome is out of the question and I don't think I will get the black one either because black traps heat and if they don't run any better than a standard silver one, why get it? Also I really don't care that much about what my engine looks like. I am most concerned about getting decent crank bearings, needle bearings, NOT bushings, quality piston rings, etc. I don't mind spending a little more for these things but who can you trust? nobody!
I saw
this one from BGF on ebay. It looks like the same BGF engine as the chrome and black ones but just in standard silver. I asked the guy at ebay if the chrome one came with 203 bearings and he wrote back in broken english "202". I suspect the 203 ones are bigger and better?? I am kinda leaning toward
this one mostly because it clearly says "203 crank bearings, needle bearings." There is a guy at Motovelo.com who claims his are "high performance," "The best bike engines money can buy!" and wants $165, no tax, free shipping. I'm considering possibly getting one from him also.
I don't mind saying that I am pretty disappointed in the way these engines are sold. Most places offer no engine specs at all for what they are selling and several places don't sell the engines except only when you buy the entire kit. Just showing a picture isn't much to go on. It's no wonder so many members here claim "they are all the same" or "it's a shot in the dark" when you buy these things. I wish I had come here before I originally got my kit, my engine might still be running if I had. Okay, sorry, didn't mean to whine.
Thanks again to everyone for all the help I have gotten on these MB forums. I'm still a total rookie but I'm learning. In spite of the frustrations it's a really cool hobby and I love to ride! This was my first build and I'm totally hooked now. After I replace this engine I'm considering building 4 stroke MB.