2003 johnson 15hp bumps and backfires

all duck'd up

Petty Officer 2nd Class
Joined
Oct 20, 2011
Messages
166
i bought this motor about 3 months ago and its ran great the last few times ive taken it out but every now and them it bumps and backfires. tryed to get it to do it in the yard with muffs on but the stuck-up people across the street give dirty looks so its best if i dont smoak them out haha :D it had a full tank of gas what i got it and im thinking that it has water in it or maybe too much oil it smoaks a great deal. i normally run a synthetic and it dosnt smoak as much.

should i dump this gas or just run it out? its not shutting the motor off or fouling plugs
 

raczekp1

Lieutenant
Joined
Mar 30, 2010
Messages
1,327
Re: 2003 johnson 15hp bumps and backfires

can you post some movi by youtube.com service?
 

all duck'd up

Petty Officer 2nd Class
Joined
Oct 20, 2011
Messages
166
Re: 2003 johnson 15hp bumps and backfires

i think its the old oil/gas mix the motor has a oily substance that drained out of it after i turned it on its side to store it in my shed.
 
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