A lawnmower engine has to have 4 things in order for it to operate properly (besides good compression). 1. Clean oil ...straight SAE 30 in summer 2. Clean Air (Good Filter) 3. Clean Fuel (no older than 30 days or so) and lastly a strong spark..blue is good, yellow is weak. It may run without these 4 things up to par, but not for long! Start looking around on the mower and try to determine if these things are OK for starters.
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A lawnmower engine has to have 4 things in order for it to operate properly (besides good compression). 1. Clean oil ...straight SAE 30 in summer 2. Clean Air (Good Filter) 3. Clean Fuel (no older than 30 days or so) and lastly a strong spark..blue is good, yellow is weak. It may run without these 4 things up to par, but not for long! Start looking around on the mower and try to determine if these things are OK for starters.