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Briggs Searching For Revs.


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#1 Marty'70 ONLINE  

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Posted June 12, 2013 - 06:17 PM

Well murphy's law attacked me again today. I got a Yard Machine Mower with a 16.5 hp Briggs on it. After about 1 1/2 hrs mowing this afternoon,it started acting like it was running out of gas, like searching for rpms. After some quick looking, i figured on a good old tune up to start with.. was given the tractor last fall and did nothing but change the oil and start mowing with it. So went up the road and got 2' of fuel line, a gas filter, spark plug and struck out on the air filter but cleaned it out. I also bought a can of carb cleaner since i figured on possible dirt in fuel was causing the problem. Got home and did all the work, took off the carb and completely cleaned it out( was spotless by the way) put it all back together and still the same thing.... runs fine at idle, but when you throttle it up it seems like it's starving for fuel. even took the fuel cap off and tried it to see if maybe a plugged cap vent, but no change.... any help would be appreciated.



#2 WNYTractorTinkerer ONLINE  

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Posted June 12, 2013 - 07:48 PM

Sounds like you may have missed something somewhere in your carb cleaning or your fuel pump is failing or filter is plugging..  Did you check fuel quality/flow from the tank??  Just a few thoughts..



#3 superaben OFFLINE  

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Posted June 12, 2013 - 08:15 PM

Tell us about the carburetor.  Is this a Briggs model, a Walbro or a Nikki? 

 

Did you replace the float needle valve?  Could it be sticking?

 

Ben W.



#4 LilysDad OFFLINE  

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Posted June 12, 2013 - 08:23 PM

Runs on idle, but not on full rpm. Are you sure the main jet is clean?

 

One other thing, an engine will do that if the battery is about dead. The plug will start misfiring.



#5 Marty'70 ONLINE  

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Posted June 12, 2013 - 09:32 PM

Tell us about the carburetor.  Is this a Briggs model, a Walbro or a Nikki? 

 

Did you replace the float needle valve?  Could it be sticking?

 

Ben W.

nikki



#6 Marty'70 ONLINE  

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Posted June 12, 2013 - 09:33 PM

Runs on idle, but not on full rpm. Are you sure the main jet is clean?

 

One other thing, an engine will do that if the battery is about dead. The plug will start misfiring.

was able to blow air and carb cleaner through all ports.. starts fine. no battery problems



#7 Marty'70 ONLINE  

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Posted June 12, 2013 - 09:35 PM

Sounds like you may have missed something somewhere in your carb cleaning or your fuel pump is failing or filter is plugging..  Did you check fuel quality/flow from the tank??  Just a few thoughts..

gravity feed no pump.. full pipe running out.



#8 Marty'70 ONLINE  

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Posted June 12, 2013 - 09:38 PM

gonna do a double check on carb in the morning. take it apart again and THOROUGHLY clean and check. also question about possibly the solenoid-ish thing in the bottom of the carb.. could it be close but not completely bad and just  starving the engine for fuel? if it is bad can i delete it with a plug? is it pipe thread or bolt thread?



#9 EricFromPa ONLINE  

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Posted June 13, 2013 - 02:04 AM

I cut the tip off of those solenoids when they start to stick or quit working.1 Bad thing about cutting it off is that,If your Float needle is getting hard and brittle it will allow fuel to fill the entire engine block up and you'll end up blowing the head gasket and oil sump gasket if you don't catch it.

 

Those darn things are $50+ to replace.

http://www.ebay.com/...=item1e611192b6

 

 

I cut the tip off and put a cheap fuel shut off valve in the line.That will fix her for good.

http://www.ebay.com/...=item1c30796526


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#10 Marty'70 ONLINE  

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Posted June 13, 2013 - 08:35 AM

Thanks for the tip Eric and did you guys get hammered with weather last night? we had a good rain show and some rain but missed the large amounts of rain and wind here in northern Indiana county.






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