Carb Overhauled - So Far, So Good
I had planned to replace the jets at some point - but as he mower wasn't surging much under full throttle hadn't done it yet.
Took the carb off, and did the following:
- Cleaned Carb and Area Around Carb with Carb Cleaner
- Replaced Pilot Jet - Briggs & Stratton 42.5 Jet (801308)
- Replaced Throttle Plate - Lawn Boy 98-7047
- Replaced Internal Fuel Filter (in carb) with Lawn Boy 94-5787
- Replaced gas line adding in-line fuel filter and right angle shutoff
- Replaced Spark Plug (old one didn't look to be in too bad a shape but replaced anyway)
Once all together and running I adjusted the speed control vane till engine was running @ about 3500 RPM full throttle (clockwise to increase rpm- counter clock to decrease) which gave about 2400 RPM at minimum throttle.
NOTE: Not sure if I needed to as could see no sign of locking compound on the threads when I undid them but I applied a little locktite thread compound to the threads when assembling to avoid them coming loose with motor vibration.
With how cheap they are I replaced the gaskets at the same time. All the parts together cost about $20. Parts List included:
- Briggs&Stratton .425mm Jet (801308)
- Lawn Boy Throttle Plate (98-7047)
- Lawn Boy Fuel Filter (94-5787)
- Lawn Boy Float Gasket (98-1362)
- Lawn Boy Air Filter Gasket (95-7613)
- 2 x Lawn Boy Intake Gasket (94-5795)
- Generic Inline Fuel Filter
- Generic Right Angle Shutoff
- Champion Plug (CJ8Y)
Haven't given it a workout yet - but running on the bench now runs on slow and fast with surging almost gone (very slight on low throttle and cold). Only problem is that it races when first started if given more than two shots of the primer.
Will report back once it has had a workout.