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1972 yamaha 125cc should I rejet?

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I've got a 1972 two stroke yamaha at2 125cc and I dont have a reliable oil pump.  I am premixing and just running it all through the regular tank.  The carb is the stock mikuni. Should I have to change the jets in the carb to get it to run smooth without using the oil injection? Thanks for any help given in advance

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