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View Full Version : 1994 Briggs/Stratton 16HP Twin II (Runs but won't stay running)


nailhead
Jun 24, 2010, 05:27 AM
This motor is on a 1994 Murray riding mower. The initial problem started last year when I lost spark in 1 cylinder. I replaced the coil, regained spark in both cylinders. But now this season, it will only run if gas is poured into carburetor, it seems to have vacuum but carb won't pull gas through. I replaced the diaphram, springs but none of this helped. The gas is pouring into the engine oil, it seems to be making oil. Is this a sign of an internal problem? I am completely stumped at this point and any help would be appreciated. If the engine is shot, I don't want to keep throwing money at it.
Thanks
Dave Jackson

KISS
Jun 24, 2010, 01:48 PM
Do you have oil in the air cleaner?

ballengerb1
Jun 24, 2010, 01:50 PM
Sounds like your float is not closing all the way. Excess fuel flows into the cylinder and seeps past the rings raising the oil level. Clean or replace the needle valve and seat, dump and flush the crank, put in new 30W

nailhead
Jun 25, 2010, 02:06 AM
Thanks for the reply. I give it another look and see what happens.

KISS
Jun 25, 2010, 12:10 PM
A sticking fuel valve seems most likely. Wanted to rule out oil breather. Use Seafoam in small amt. of gas and/or dissasemble and clean carb.

KISS
Jun 25, 2010, 12:12 PM
Bb:
A float on a diaphram carb?

ballengerb1
Jun 25, 2010, 12:23 PM
KISS: I think this B&G has a float carb. I have 2 newer V twins with floats but not 100% certain. What with all the gray rating marks we are getting this week?

KISS
Jun 25, 2010, 12:45 PM
The OP said "replaced the diaphram" though.

Grey - color of the week

DG
Jun 25, 2010, 06:14 PM
This one has a diaphram pump on the front and a float inside the bowl.

KISS
Jun 25, 2010, 06:33 PM
Then the fuel valve is sticking. It's activated by the float.

DG
Jun 26, 2010, 06:08 AM
I agree KISS that's about all it can be.