Sty57
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Don't the 281 have a 52mm bore? Compared to the 54mm bore on the 288.Cylinders were different as well. The 181 has a tiny combustion chamber, and some had a thin ring full circle piston. The mufflers were different as well I believe. Some 281s came with the high top setup, all 181s were low top. Also, the early 181 used the smaller 6202 bearing and smaller seal on the flywheel side, so the early cranks are different.
What about the 181, is it 52 or 54mm?