ok itll crank first second kick idle great but as soon as i put it n first it wont rev up and has no power it wont even climb this little hill in my drive way so whats the problem? Also the case is cracked a little where the clutch spring goes in so i think mayb the clutch isnt disengagin good could that cause it and how do i fix it? also there was oil on my spark plug my uncle said that wasnt normal my dad said it was so which is right?