50,66,80,100, 110 cc engine geometries and configuration

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Mar 7, 2024
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Washburn MO
The reason I'm making this is because some of us would like to know exactly how to tune our specific engine, but as a result there are so many different types of engines including the China doll style engines that are cheap and plentiful to buy and build which is why we love them, but there is also a very large variety of engine geometries along with different types of cylinders and heads and this can cause some confusion for new builders, especially if they are trying to do performance builds, so I would like all of us fellow gearheads and speed demons to come together and try to make a community thread specifically with your engines and engines that you are familiar with and post pictures,

tell us what type of geometries that you have such as NT/HT/YD100 (in the context of the difference between a lifan 125 pit bike or street bike engine in comparison to a GY6 of the same displacement is how I would like to treat this thread) and other various geometries because I am still new to the "fine print" you could say.
I simply Frankenstein my engines together and they hold themselves together with hopes and dreams and so far I've gotten quite a bit of luck out of it (and horsepower) but some people aren't so lucky so let's hope we can help them out shall we?
 
As you could see these two different engines are two different variations if you're familiar with the odd little stamp on the black 100cc I would be interested to know what type of engine configuration that I have with this one the silver one simply has a 2021-f80 stamp on the cylinder but that is the only identifying marks that this engine has
 

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I could assume that the silver 80cc is a flying horse engine and I got excellent performance out of it, it came from a kit that I bought off of wish back in 2021 for $120 it had zero modifications to the internals but I did take off the muffler cap slap a $35 knockoff card which is what I currently use on my 100cc engine with two 2-in PVC elbows acting as a RAM air intake that gave me a massive increase in power output
 

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As you could see these two different engines are two different variations if you're familiar with the odd little stamp on the black 100cc I would be interested to know what type of engine configuration that I have with this one the silver one simply has a 2021-f80 stamp on the cylinder but that is the only identifying marks that this engine has
Cylinder is on backward.
 
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