20 hp briggs running extreamly lean

rusty1 · 08-30-2009, 05:34 PM

this is not on a cart i have a 20 hp briggs running lean to idle you have to pul the choke just about all the way out or it will lope pulled plugs and there were white as white could be any suggestions

pbillyi69 · 08-30-2009, 08:35 PM

that sounds like a carb adjustment to me unless the timing is off...

rusty1 · 08-30-2009, 08:49 PM

motor is only a year old was running fine just went back out and piddled again fuel filter is not filling up hope it is just the fuel pump blowed out all lines and filter still not filling up

pbillyi69 · 08-30-2009, 09:26 PM

even if it isn't getting enough gas the plugs shouldn't be white..

tonyton · 08-30-2009, 09:29 PM

Hi rusty, That fuel filter won't fill up until the pump starts pumping into it. Even after it runs the filter will only be half full. They usually have air in them, unless it's a gravity fed system.
Sounds like dirt in the carb but, since the fuel delivery system is questionable start there. Test your fuel pump. Remove the line to the carb and turn over the motor. It should spurt out gas in pulses. If it doesn't check the vacuum line from the motor to the fuel pump. That is a remote fuel pump? correct?? Once you determine the fuel pump is working, clean the carburator. Remove, disassemble, clean and re-assemble.
If it's still lean, it's probably an air leak. Carb gasket or crankseal...
Let us know what happens...

DOOmsman · 08-31-2009, 10:13 AM

Quote:

Originally Posted by pbillyi69

even if it isn't getting enough gas the plugs shouldn't be white..

Not enough gas is lean, those plugs are white do not use the engine until you fix the problem, it may be a plugged inlet in the carb or a plugged main jet, air leak at the carb mount. Good luck keep us posted.

rusty1 · 08-31-2009, 12:47 PM

leaning more toward a problem in the carb started it up thismorning while it was running sprayed wd 40 around all the mounting points no change guess i will pull the cart and soak it also wile it was running pulles off the fuel line had good flow fron the pump

shawn.m · 08-31-2009, 01:59 PM

did you spray around the throttle shaft to see if it was worn? I would pull the carb and clean it. Not much to this carb. Remember that you have to pull the cover off to unhook the fuel stop valve

rusty1 · 08-31-2009, 08:38 PM

ok guys went back and took the carb off and apart there was some rust in the bowl really fine took it complerly apart and soaked it in gas then blowed the hell out of it out with air then started putting back together put a peice on and blow it out again with air . got it put all back together and put it back on started it up and the same thing loping then it shut off i said a few choice words then started it back up it spit and sutttered. i thought fine i will just order a new one then it started running fine. let it run a few min running fine guess i moved a piece of rust were it finally worked its way out. i will run it a little tomorrow then check the plugs sure dont want to burn a valve or a piston. thanks for all the help

tonyton · 08-31-2009, 09:09 PM

Thanks for the update. Keep us posted.

08-30-2009, 05:34 PM	#1
rusty1 Gone Wild Join Date: Mar 2009 Location: cochran georgia Posts: 300	20 hp briggs running extreamly lean this is not on a cart i have a 20 hp briggs running lean to idle you have to pul the choke just about all the way out or it will lope pulled plugs and there were white as white could be any suggestions

08-30-2009, 08:35 PM	#2
pbillyi69 shut up & hang on Join Date: Jun 2009 Location: gladstone, or Posts: 1,168	Re: 20 hp briggs running extreamly lean that sounds like a carb adjustment to me unless the timing is off...

08-30-2009, 08:49 PM	#3
rusty1 Gone Wild Join Date: Mar 2009 Location: cochran georgia Posts: 300	Re: 20 hp briggs running extreamly lean motor is only a year old was running fine just went back out and piddled again fuel filter is not filling up hope it is just the fuel pump blowed out all lines and filter still not filling up

08-30-2009, 09:26 PM	#4
pbillyi69 shut up & hang on Join Date: Jun 2009 Location: gladstone, or Posts: 1,168	Re: 20 hp briggs running extreamly lean even if it isn't getting enough gas the plugs shouldn't be white..

08-30-2009, 09:29 PM	#5
tonyton Gone Wild Join Date: Jan 2009 Location: Alabama Posts: 2,120	Re: 20 hp briggs running extreamly lean Hi rusty, That fuel filter won't fill up until the pump starts pumping into it. Even after it runs the filter will only be half full. They usually have air in them, unless it's a gravity fed system. Sounds like dirt in the carb but, since the fuel delivery system is questionable start there. Test your fuel pump. Remove the line to the carb and turn over the motor. It should spurt out gas in pulses. If it doesn't check the vacuum line from the motor to the fuel pump. That is a remote fuel pump? correct?? Once you determine the fuel pump is working, clean the carburator. Remove, disassemble, clean and re-assemble. If it's still lean, it's probably an air leak. Carb gasket or crankseal... Let us know what happens...

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08-31-2009, 12:47 PM	#7
rusty1 Gone Wild Join Date: Mar 2009 Location: cochran georgia Posts: 300	Re: 20 hp briggs running extreamly lean leaning more toward a problem in the carb started it up thismorning while it was running sprayed wd 40 around all the mounting points no change guess i will pull the cart and soak it also wile it was running pulles off the fuel line had good flow fron the pump

08-31-2009, 01:59 PM	#8
shawn.m Gone Wild Join Date: Aug 2007 Location: near sacramento,ca Posts: 1,895	Re: 20 hp briggs running extreamly lean did you spray around the throttle shaft to see if it was worn? I would pull the carb and clean it. Not much to this carb. Remember that you have to pull the cover off to unhook the fuel stop valve

08-31-2009, 08:38 PM	#9
rusty1 Gone Wild Join Date: Mar 2009 Location: cochran georgia Posts: 300	Re: 20 hp briggs running extreamly lean ok guys went back and took the carb off and apart there was some rust in the bowl really fine took it complerly apart and soaked it in gas then blowed the hell out of it out with air then started putting back together put a peice on and blow it out again with air . got it put all back together and put it back on started it up and the same thing loping then it shut off i said a few choice words then started it back up it spit and sutttered. i thought fine i will just order a new one then it started running fine. let it run a few min running fine guess i moved a piece of rust were it finally worked its way out. i will run it a little tomorrow then check the plugs sure dont want to burn a valve or a piston. thanks for all the help

08-31-2009, 09:09 PM	#10
tonyton Gone Wild Join Date: Jan 2009 Location: Alabama Posts: 2,120	Re: 20 hp briggs running extreamly lean Thanks for the update. Keep us posted.

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