1933 Massey Harris Model 25

This is a 1933 Massey Harris Model 25 Unstyled It has always been painted red and I can't find any green under the red paint. I just got it running today 4/10/16 for the first time in many years it is Serial # 69247 This tractor has had the nickname "Donuts" it's entire life because of the large tires.

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The clutch on my 25 requires me to hold it in place. Can I adjust this?