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Montesa Crankshaft Counter Balance

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Can I fit a counter balance weight from a 349 onto a 248 Crankshaft. The 248 has a part no 5160 171 02, whilst the 349 part no is 5160 171 03 Failing the conversion can anybody suggest where I can obtain a new or second hand 248 counter balance weight. Thank you. 

I think the 248 and 349 engines are the same apart from the bore so you should be able to fit it. As an aside I turned down the counterweight on my 348 a bit to put less stress on the crank and get a better engine response.

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