Oil level risen and smells like gasoline

I still haven't fixed the floats on my Seca 750 so it's still running VERY rich. I've stopped riding it but tonight I took it out for a quick spin because I was out of the country last week and am leaving town again tomorrow. It's been real cold here and I don't want to kill the battery.

I checked the oil level after a 10 minute ride and saw that it was above the top of the sight window. I assumed gas entered the case and sure enough the fill hole reeked of gas. I know the engine is running real rich but how is that much gas getting inside to the oil pan?

Now I'm really through riding it until I fix the carbs.

 

It goes down the cylinders.
Pull the fuel line & check the petcock is shutting off.

 

Just realized I posted this in the wrong section. Whooops.

Thanks. I will check the petcock.

 

Until you can get to the root problem ... you can get a Briggs & Stratton Fuel Line Shut-Off Valve at a Hardware Store and install it next to the Petcock.

Cheap quick fix until you deal with the Petcock Leak.
They come straight line or right angle.

 

Ryan; It's a two-pronged problem. If everything was working correctly, you could (theoretically) leave it on PRI all the time and the floats would shut off the flow. It takes a float problem (may not be adjustment, could be crud) AND a leaky petcock to fill the crankcase with gas.

 

Rut Ro Raggy! That sucks....

Rob

 

A black plug might tell on the leaky float.

 

Quoting bigfitz52 “It's a two-pronged problem”

2 of the following have to happen at the same time.

Defective petcock (I had/have this problem)

Non floating float/s (a Yamaha mechanic told me he had seen some bad black floats)

Improperly adjusted float (I had this)

One or more leaking needle seat/s (I had this)

Edit Quote: “It's a two, three or four-pronged problem”

ab

 

Ryan, pull the battery, take it inside your house and put it on a trickle charger or battery conditioner. This will help it last!

Loren

 

Thanks for your suggestions. I'm positive the floats need to be adjusted, as all 4 plugs are black. I just didn't realize mis-adjusted floats would let THAT much gasoline past the piston. Once we have a day above the 30's I'll take the carbs off again and adjust the floats, put in new plugs, and change the oil.

 

You can save yourself a little time by checking the float level now- - "as-is" then see if at least ONE of your carbs is close, or right on, then adjust the other 3 to match, then re-check on the bench.

 

All 4 plugs are fouled, so wouldn't that mean all 4 floats are set too high?

 

No, It means you are getting too much fuel.
It COULD mean all 4 floats are set equally wrong.
It could mean all 4 pilots are set wrong.
It could mean you have a pluged air filter.
it could mean your "choke" doesn't close.
It could be due to a crankcase full of gas, the vapors make you run rich.

It's a process of elimination.

 

Ok. Thanks.

I know it's not the choke sticking because I disassembled that entire linkage, cleaned and polished it, and checked it when I rebuilt the carbs. The pilots were set to the factory setting, and the airfilters aren't clogged. I have pods and they were all checked during the rebuild.

 

Add: Diaphragm Pistons failing to descend do to Oxidation in the Bores.

Start at the Petcock and Troubleshoot your way down through the Carbs.
Approaching 25-30 Years on everything is reason enough to need to not overlook anything in the process.

Its a good excuse for exchanging the fasteners holding the Fuel Bowls and Carb Hats for new ones.