Picture this, it's 11:30pm at night, I quietly shuffle out to the bike and put on my helmet and gloves. I open the choke and press the start button then BANG! The whole neighborhood is awake. I recently changed the plugs and cleaned and re-oiled the oil filter on my 2002 ZX9. When I re-oiled the air filter I didn't hold back on the oil and soaked it right through then pressed it into a towel to soak up the excess oil. My question is could I have over oiled the filter making the bike run too rich causing a backfire on startup?