A stroker motor is all about an engine where the connecting rod between the piston and crankshaft having more leverage to turn the crankshaft. Try to imagine what it'd be like turning a ratchet to loosen a stubborn/seized nut or bolt with a very short handle. That is like how it is with a normal motor. A stroker would be like trying to turn that stubborn nut with a ratchet with a much longer handle for better leverage and effective torque.
The image on the left is an example of a stock engine with a stock stroke. The image on the right is an example of a stroker engine. If you watch the image carefully, the con rod on the stroker motor gets really close to smacking the bottom of the bore. On a moped block, you'd have to have someone shave/grind some of the metal off to create enough clearance to allow for a stroker crankshaft.
The beauty of the stroker is that you don't need to have all that super high rpms in order to develop the power you need to accelerate since the motor will have an easier time against a load. The engine with the normal crank will need higher rpms to achieve power.
If you want reliability for a daily rider, stick with a normal crankshaft with a big bore setup.
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