WHAT WOULD CAUSE A 2 YEAR OLD 23HP BRIGGS STRATON (HUSQVARNA) TO SURGE AND SLOW SURGE AND SLOW AND LOSE POWER WHILE MOWING AFTER BETWEEN 15 MINUTES AND ONE HOUR OF OPERATION? OTHERWISE IT PERFORMS WELL. (190 HOURS)
NEW-PLUGS,FUEL FILTER,AIR FILTER. ALSO, CHANGED OIL AND FILTER DURING A PERIOD WHEN THE PROBLEM SEEMED TO HAVE RESOLVED ITSELF
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Yes,we are still needing an answer.
When the mower begins to surge and slow, surge and slow, it willeventually die. After sitting for a while, it will restart and mow for a shortperiod again before beginning to surge and slow and surge and slow.
Hello my name is XXXXX XXXXX X will try to help you with this issue.This sounds like either a vapor lock issue or a fuel solenoid problem. I am leaning more toward a vapor lock.A few questions:what is the temps where you are mowing.What octane fuel are you using?Kevin
I have worked twenty years as a Mechanic and am a State of Michigan Certified teacher in Small Engine and related equipment.
Ttemperature when mowing is 85 to 90, although in previous years it's been 95 +/- with no problem.
Octane is 87 as has always been the case in all my 4-cycle equipment and vehicles.
Additional comment: What would be the solution/prevention to vapor lock?
In a nutshell heat is the killer for vapor lock. Fuel quality has changed over the years and it seems the 87 is quite unstable in the heat especially if you are getting some leftover winter blend fuel. A simple check is go run high octane of 91 or higher and see what happens. Also make sure the cooling system is clean, that means using a degreaser and spraying out the flywheel, shroud, vents etc and making sure it is dirt free. If that doesn't do it then a rerouting of the fuel line and /or moving the pump if equipped may be necessary. I have often questioned factory techs as to why after a certain time they do this. Answers have not been satisfactory to me I just know that these are techniques that can lessen or eliminate the problem. Try the high octane and cleaning first then we can go further if need be.