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I think his spreadsheet may be wrong....
That's why I said "don't think so". I always avoided the 021 thinking I couldn't put an 025 top on it.Ummm.
Don't think so.
023/025 share crank.
021 shorter stroke.
That whole things confusing. Lists same bore and stroke with different displacements.I could be reading it incorrectly, but below is a screen shot from the Stihl 021/023/025 Service Manual. Page 3. Under all four variations (021/021L/023/025) it shows a 32mm stroke. Oddly, it does say 28mm immediately adjacent to the word "Stroke", so perhaps the manual is misprinted?
View attachment 406338
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