bought this mower last week & wanting to know what year model it is ? has an 11hp honda motor.

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have had one problem with it.mowed great for about 1/2 an hour then the revs slowly dropped & stalled,wouldn`t start until i let it sit for about an hour.cleaned the plug & fuel filter & ran fine again but then did the same thing.pulled the plug & it was nice & clean,same with fuel filter.

checked the oil which needed 300ml,could this have caused it to over heat ?

many thanks
jason