Small Engines (Lawn Mowers, etc.): briggs@stratton l/mower 4 stroke sprint, briggs stratton, leak gas

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I have had this lawnmower for 4 years started the other day blew clouds of white smoke I put my hand over the exhaust and it was spitting oil can you advise me of the problem.
I have removed the front of the motor the piston is black and there is a little oil in the chamber
should i go further never removed piston before
and not sure if it is the problem.....
I have never had a problem before this.
Answer -
Does the oil smell like gasoline?

no but the airfilter was soaked in oil


What is the engines model number?
im not sure where to find the number  it is a sprint 375
on the mower back panel there is model no 03026S
HOPE THIS HELPS      JOHN.......
















no need to dis-assemble any more of the engine.

Let me know about the questions.
Eric
Answer -
The model should be stamped on the engine fan shroud, the top metal engine sheet metal containing the starter.

I believe you have an L-head engine but I need the model, type and code number to tell for sure. MODEL 98902 TYPE 2163E1
CODE 01061851 eric hope i have got it right this time
thank you for your patience.....john

Eric

Answer
These engines are very reliable.

Are you using SAE-30 oil and is the correct amount in the mower?

You particular engine will not leak gas into the oil like other models.  It's possible the rings and valve guides are wore a little but it's not worth rebuilding the engine.

Have you ever performed any type of valve work?
If not, I would recommend putting the engine back together, changing the oil and using it.  If the mower seems to use oil then it may be time for another mower.

Let me know if this helps.
Eric