Judo throw doesnt work? helpplease?

Hi I just learned the judo throw ippon seoi nage and tried it during class on an opponent my size(it worked) but the thing is tried doing it to my friend who was larger and i couldnt.. i heard u can throw bigger opponents/that bigger is easier but i had a lot of trouble trying to throw him because of his weight and... show more Hi I just learned the judo throw ippon seoi nage and tried it during class on an opponent my size(it worked) but the thing is tried doing it to my friend who was larger and i couldnt.. i heard u can throw bigger opponents/that bigger is easier but i had a lot of trouble trying to throw him because of his weight and size. am i doing anything wrong
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