Briggs and Stratton V twin engine.

[fleehillfarm]

Thank you very much pleasant for very good information .

[fleehillfarm]

I eventually removed the carburettor and dismantled it and cleaned out all the jets and cleaned it with carb cleaner. When I reassembled it to my honest astonishment it started first pull and ran beautifully. I drove it from my garage to a barn a distance of about 100 yds. By the time I got to the barn black smoke started pouring out of the exhaust. When I removed the plugs they were covered in oil. My question is have I done something wrong when reassembling the engine or has it coincidentally just blown a piston ring or head  gasket. As it's a V twin and both plugs were oily it's a bit of a coincidence if both chambers had piston rings failing at the same time. Many thanks for any guidance.

[openspaceman]

oil burning is normally blue or grey, sounds like a massively  rich mixture which would explain both cylinders affected

[fleehillfarm]

If it is just a massively rich mixture how do I remedy that? The carb has two mixture adjusters on the top that have limiter buttons fitted. One of these is intact so I put it in the middle, but the other is missing. Do I screw that one in until it seats and then back it of one and a half turns as is normally suggested?

[openspaceman]

I don't know anything specifically about this engine or carburettor. Could the main jet have become loose?

[GarethM]

Or Google the carburettor manual and adjust accordingly 

[Dan Maynard]

I once put an air filter gasket the wrong way round, result was lovely running for a couple of hours then stop with black plugs.

 

Are they really covered in oil or just black, with wet soot?

[fleehillfarm]

It's definitely oil. The breather pipe that goes into the back of the air filter is badly deteriorated. I'm trying to get a new one online. Could that be an issue? 

[Mick Jones]

If it is definately oil entering the combustion chamber worth disconnecting the breather from the crankcase to the air filter ( thats just an emissions requirement thing.) This eliminates the chance of it being oil entering the top end of the engine via the breather pipe. Also check oil isn,t overfilled.

                  The other possibility if its not oil is that when you had the carb apart some dirt was left in there (dosnt take a lot) and some of it has got under float needle causing it to run massively rich. Mick.

 

 

[adw]

Oil on the plugs is nothing to do with the carb, I am thinking blocked crankcase breather, engine over filled with oil or badly worn engine, a leak down test on each cylinder is the next line of approach, but this will need to be done by somebody with the kit to do it.