Help PLEASE with Briggs & Stratton engine.

[nsgnomad]

I need some help please with a Briggs & Stratton 17hp engine as used on ride on mowers. *I know this has nothing to do with this forum, but the are a lot of technical wizards here who might be able to shed some expertise.

The engine has I think been flooding with fuel while standing and there has been quite a bit of fuel collecting in the cylinder. *I have had the carby off and checked the float needle valve & seat and also the electrical cut-off needle for any debris or worn section and they seem to be OK. *I cleaned out the bowl and *re-assembled it, then re-installed the carby.*
I can get it to start after a lot of cranking, and it will run at idle for a couple of minutes if I pull out the fuel cut-out connector, but as soon as I reconnect it, the engine will run increasingly roughly before it stops. *If I try to increase the revs while it is running with the connector pulled out, it will stop.
I have checked the operation of the cut-out and I can hear it click as I touch the connector into place. *I have also checked the electrical side of things for the cut-off valve and there is 12v available at the plug when the key is on, 0v if the key is off, and there is 36ohm across the terminals of the cut-off *with no connection to earth, which seems reasonable.*

Note, before I pulled the carby off, I had put about 1/4 tank of fuel in, but when it wouldn't start I left it for a few days. *When I had a look at again, the tank was virtually empty.

*But I am still none the wiser.
Help please.
Roger

[Casper]

Change the needle and seat, they are known to leak while sitting after a while, even when they look good.

Also the float may have a hole in it or the tag may be bent out of shape so make sure it is properly adjusted and check to see if there is any fuel in the float.

Absolutly always turn the fuel tap off on a brigs or Kohler motor when not in use and if going to stand for a long period run the float chamber dry so the fuel in there does not go off and the needle and seat don't get stuck and then damaged when you start to use it again.

I come across this every single summer, I fit endless amounts of needle and seats and floats to all sorts of machines and still the same people every year do the same thing.

Those who have listened and shut their tap off I never hear from them again.

Maybe I should stop telling them anything....:o

Cheers Casper

[wrinklearthur]

Briggs & Stratton 17hp engine as used on ride on mowers.
The engine has I think been flooding with fuel while standing and there has been quite a bit of fuel collecting in the cylinder. I have had the carby off and checked the float needle valve & seat and also the electrical cut-off needle for any debris or worn section and they seem to be OK. *I cleaned out the bowl and *re-assembled it, then re-installed the carby.* Help please. Roger

Hi Rodger

Those motors are prone to distort the seat part of the needle and seat in the carburettor .

A simple long term fix, is to locate the fuel line coming from the tank down to the carby and cut the pipe to fit a in line fuel tap. Turn off the tap each time you finish with the motor, until you are ready to start again.

A good clean of the tank and fill with fresh fuel, stops any sticky goo getting into the carburettor jets.
.

[Casper]

Hi Rodger

Those motors are prone to distort the seat part of the needle and seat in the carby.

A simple long term fix is to locate the fuel line coming from the tank down to the carby and cut the pipe to fit a in line fuel tap. Turn off the tap each time you finish with the motor until you are ready to start again.
.

Most new stuff will already have a tap and this will not stop it from flooding at Idle now.

The N & S will need to be replaced first.

Use a 5/16 intermediate tap to remove the old seat, just start it for about half a thread and pull it out with pliers, they are not in very tight and then with a piece of dowel knock the new one in square with light blows with a small hammer.

Cheers Casper

[blitz]

Ditto all of above

my ride on the carby was so corroded from water taht is was not able to be repaired, I bought a good second hand one from the local mower place for about $50-00 from memory then needle and seat on top of that plus filter. again from memory it was under $100-00 which I thought great given I got it running the same day