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Hello my name is ***** ***** I will assist you. As for the oil fuel mixture if it is a 1999 model it is a 100:1 fuel to oil ratio. Regarding the fuel filter inside the motor, pull it out and it will come out from the cranking part, then unsrcew it and clean it, you will not break the plastic transparent bowl. As for the difficult starting, since the engine has been sitting for 2 yrs, then most probably the carb would require cleaning and ideally rebuilt as it may have blocked jets. If the priming jets get blocked it will be almost impossible to start.
The correct procedure is as follows:
Pull the priming round lever out for 3-4 times and leavg is still ie it out Then pull the pull start and if the engine carb is clean and spark is ok it should start with the first to third pull.
If anything is still unclear please post back. It really is a good engine i own one myself and would not exchange it with a brand new one.