Little power

my wifes yz 125 has little power latly and after sitting in the garage for more than a week there is a nice puddle of oil on the ground. Is the power problem from a bad seal?

well wheres the oil coming from? that will tell you whats leaking.

Not sure its the same as a 250 but towards the lower front of the case there may be a weep hole.Water coming out is a bad waterpump seal, oil is from a crank seal and yes that would cause some power loss!

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