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R1
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328 Posts
sounds like one of your cylinders in not running 100% and that may be due to spark plugs or another reason.

Did you fill oil to the correct level ?
putting too much oil in will result in the washing machine effect in the sump(bubbles)
it will also foul your plugs and fill the air box with oil from the crank case breather pipe.
 

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R1
Joined
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328 Posts
what i would do is
check the air box for oil... clean & remove any oil from inside the air box
replace the air filter
Replace the spark plugs
drain the oil
the best way i find when doing an oil change is always use a measuring cup to measure out the correct amount.
 
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