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spankyjr1
spankyjr1, Journeyman
Category: Heavy Equipment
Satisfied Customers: 2630
Experience:  Journeyman with 30 years Experience Gas Diesel LPsmall to large engine repair
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I have been a lawnmower mechanic yrs but have a strange

Customer Question

i have been a lawnmower mechanic for 3o yrs but have a strange engine fault on a customers 14.5hp briggs/stratton engine.it starts and runs on full choke for 2mins then starts hunting before stopping,carburetor overhauled at least 5 times and mixture adj no difference filters and fuel changed,s/plug fitted andstill same problem.
Submitted: 2 years ago.
Category: Heavy Equipment
Expert:  spankyjr1 replied 2 years ago.
Hi, my name is ***** *****'re having trouble today.I will do my best to assist you in resolving your issue.

Sorry about long delay.

This sounds like a typical low fuel supply issue.
It runs on choke,, starts running out of fuel so it hunts,,then have to let sit while fuel slowley comes back.

Sometimes carbs can't be rebuilt anymore and need replacement from being worn out around throttle shaft.
Confirm by spraying carb clean around carb while running to see if it will run off of choke or you see RPM increase.

Check to make sure fuel tank or fuel supply line is not partially plugged.
Make sure fuel cap is venting,,to check see if it will stay running with cap loose.

Since mixture screws don't change anything carb is sucking air from mounting or around shaft.

Thanks in advance for leaving a positive rating. If you happen to need more help, this question will stay open for weeks.

spanky
Customer: replied 2 years ago.

Hi, spankyjri,i had already tried all you suggested with no positive results

as a last resort i adjusted the valve clearances which seems to have resolved the problem.