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We have a Briggs 18.5 HP V-Twin, model 42A707 on a riding…

Customer Question
We have a Briggs...

We have a Briggs 18.5 HP V-Twin, model 42A707 on a riding mower. Engine has seen very little wear. All of a sudden it started spitting oil out the muffler and there is gas in the crankcase oil. Both cylinders check approx. 100 lbs pressure. Any suggestions

Mechanic's Assistant: Do you have fuel in the tank? If so, is the shut-off valve open and the fuel clean?

Yes

Mechanic's Assistant: Do you plan on doing the work yourself?

Yes

Mechanic's Assistant: Anything else we should know to help you best?

Not that I can think of

Submitted: 10 months ago.Category: Small Engine
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Answered in 8 minutes by:
9/20/2017
Technician: JON, Small Engine Technician replied 10 months ago
JON
JON, Small Engine Technician
Category: Small Engine
Satisfied Customers: 1,870
Experience: Certified Small Engine Technician
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Hi, my name is***** me review the issue, and I will be more than happy to help resolve it as quickly as possible. I will return in under 5 minutes

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Technician: JON, Small Engine Technician replied 10 months ago

t​his is caused by the carb not sealing off and fuel leaking into the crankcase. you will need to change the oil and clean the carb. a carb rebuild is sometimes needed also. I would recommend installing an inline fuel shut off valve to keep this from happening again

Let me know if you need anything else as I am here for you. Please remember to RATE me as I strive to do my BEST, ***** ***** ratings help me to achieve this. 5 STAR RATING IS MY GOAL AND WHAT I STRIVE FOR

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Customer reply replied 10 months ago
Sounds like he knows what he is talking about. It will be a week or two before I can work on it, so I won't know until then if that cures the problem. Until then, thanks.
Technician: JON, Small Engine Technician replied 10 months ago

not a problem. just let me know.

Please remember to RATE me as I strive to do my BEST, ***** ***** ratings help me to achieve this. I hope I have answered in a timely manner. 5 STAR RATING IS MY GOAL AND WHAT I STRIVE FOR. We can continue here when you are ready

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