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

Asked Jun 24, 2010, 05:27 AM — 11 Answers
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

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11 Answers
KISS's Avatar
KISS Posts: 12,602, Reputation: 4378
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#2

Jun 24, 2010, 01:48 PM
Do you have oil in the air cleaner?
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ballengerb1's Avatar
ballengerb1 Posts: 25,642, Reputation: 11296
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#3

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
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nailhead Posts: 3, Reputation: 10
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#4

Jun 25, 2010, 02:06 AM
Comment on ballengerb1's post
Quote:
Originally Posted by ballengerb1 View Post
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
Thanks for the reply. I give it another look and see what happens.
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KISS's Avatar
KISS Posts: 12,602, Reputation: 4378
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#5

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.
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KISS's Avatar
KISS Posts: 12,602, Reputation: 4378
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#6

Jun 25, 2010, 12:12 PM
Bb:
A float on a diaphram carb?
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ballengerb1's Avatar
ballengerb1 Posts: 25,642, Reputation: 11296
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#7

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?
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KISS's Avatar
KISS Posts: 12,602, Reputation: 4378
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#8

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

Grey - color of the week
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DG's Avatar
DG Posts: 1,297, Reputation: 566
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#9

Jun 25, 2010, 06:14 PM
This one has a diaphram pump on the front and a float inside the bowl.
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KISS's Avatar
KISS Posts: 12,602, Reputation: 4378
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#10

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