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a 250cc engine will cost about $900-1000. Upgrading the existing 150 to about 180cc will cost about $600. The advantage to the 250 is its water cooled and will run at the higher speeds with no issues.
I have a 61mm BBK(170cc I believe) and can get to 55mph WOT, I get there pretty quick tho (which means final drive gearing can be switched out to achieve 60 comfortably) but again, the temperatures are up there compared to normal and that will cause issues in the long run.

I have wanted to smooth the fins off of a jug and attach a few computer heatsinks the correct orientation covering the whole thing but that is a bit of cash and would take a bit of ingenuity

If its leaking.that much oil that its in the.muffler it is probably a gasket

Does it smoke during idle? If so slower wont help. The combustion in the engine forces the rings out, that's why I said to go wot, to force them out against the cylinder and make then seat better.

First thing I did with my new scoot was warm it up good by driving slow then go wot.for about a half mile at a time..I was burning oil at first but it stopped fast

My only option was blue or black.... I would rather be seen even tho the black looked good. I'm about to add some led break lighting to my trunk (bright and dim for running lights and break lights) I will have to do a.write up when I do

If it is one of.the silver aluminum sleeved mufflers the catalytic converter in it has probably fell off of the spot weld that was holding it in place. If you have the tools and the patience to.deal with welding thin metal it only costs the amount of time you are willing to put into.it to make it sound good and quiet and still flow well. (First time welding and at that with an arc welder it took me 3 hours to get everything inside back together and back inside)