Review on STHUS Motorized Bicycle Bike 80cc Engine Crankcase with 8mm Studs - Engine Part by James Vilchez

FYI I bought two of them in a row. Nothing to dislike about this product. Both sent back at once, what I didn't like was the poor quality of the mating surfaces, it looks like they missed a hole when drilling the bolts, so the mating surface was smeared. In the second case, it looks like someone dropped it on the work surface where the head goes in. Haven't tried it for the third time.