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With the MC-54-250B scooters using the Linhai 257cc engine, the engine serial number is located right next to the left rear shock on the CVT drive case. Since the CVT drive case is also the engine case they can put it there. It is a nice easy to see location, but if you don't know about it, you will be looking at all the other wrong places for it.

The VIN number is normally a panel affixed to the frame right next to the gas tank cap, under the cover of course.

The VIN plate looks something like this one here:

Too lean of a engine will cause it to overheat. Check your airfilter intake boot and intake manifold closely. You very likely have a crack or cracks that are letting air leak into the system causing the engine to run too lean. This is the most common ailments with the 150cc scooter engines. That rubber intake manifold tends to dry out fast and start cracking and leaking. The large air filter box rubber boot also tends to have that problem too. I have had the rubber boot between the air filter box and the carb come loose and it caused the engine to not be able to go faster than 25mph then.

You might want to go one or two sizes larger on the jet in the carburetor as they tend to be set very lean like that from the factory too, right on the thin razor's edge of being too lean. Thus it takes very little for something to cause it to be too lean.

Another thought is the PAIR system may be leaking and causing it to to be a bit too lean. But it isn't the pair system per se, as much as the vacuum lines going everywhere can develop an airleak. If the PAIR system valve fails the rubber hoses burn up pretty quickly.

The carb diaphragm for the CV slide valve can sometimes be a problem if it develops a small tiny pinhole or tear in in.

If you haven't done it also check the valve gaps to make sure they are OK, if the valve gaps close up, the engine starts doing funky things like stalling out at stop lights or stop signs as you slow down, not wanting to idle good, etc.

Now then one needs to be careful with a new engine, they run more hot at first until they get broke in and run in real good. If it is hot outside and you are riding around at or near full throttle all the time, the engine does get real hot like that. But normally dieseling went out of style with the old automobile engines and their crappy mechanical emissions systems of that era years ago. The computer controlled systems they use today don't have that problem.

That is a pretty awesome ride to do. Even more so using a 50cc scooter to do it. Congratulations. Yeah rider fatigue can get everyone.

Those huge Gallinipper mosquitos they have down in Florida and in some places in Minnisota have the be the worst ones. They'll bite through clothes and are very aggressive. Deet doesn't repel them either. Worst is they don't have a anesthetic in their saliva so when they dig in with their long snouts it is like someone sticking you deep with a nail.

Around here where I live we have basically three types of mosquitos, two are the home grown variety and a new comer from Asia now. The little itty bitty ones I like to call "Ankle Biters" as they tend to not go much higher than about 6 inches or so above the ground. Then there are the regular mosquitos that tend to buzz past your ears giving you some warning maybe. The Asian ones tend to be pretty aggressive and will bite through thin clothing like T-shirts etc. But fortunately we don't have any of those vicious Gallinippers around here yet.

Oh I have a pic of it here, but it is too horrid to display.

The concept of money was invented in ancient times around 450 BC. At the time it was a way for people to pay their taxes. They would trade their produce or products and get coins that they would use to pay the tax collector with. Of course the concept took off like wildfire and everyone started using it as it is so convenient. But it was always based on something tangible at the time. But now in modern times money is a intangible product.