Its 5 tousnds intakew and exhaust
Cold engine adjust the valve lash to 5 thousands (.005) for both exhaust and intake valves.
SOURCE: Stratton Briggs Stratton Intek V - Twin Engine 21
The oil is contaminated with water. Change oil and filter, if it has one.
SOURCE: Briggs & Stratton Briggs Stratton Intek V -
these are common for doing this ,if you dont want to pull it down and hone the cyl. then i would use a heavier oil say 20w/50and that will probabley solve your problem
SOURCE: Can a novice replace a carburetor on a Briggs
Yes its pretty easy you can do it.Are you sure the carb is bad most of them just need a good cleaning .I would disassemble be careful there are some little parts in there and if you are careful and pay attention as you disassemble it you can just clean it .Go to auto parts store get a can of spray carb cleaner .remove bowl be careful the is a float in there a little square or round bellows .Slide the pin out and then the fuel loat pin underneate the float now take out any adjustment screws you can find and spray cleaner in every hole you can find several times and reassemble if idle or fuel mixture screws were removed a standard setting of 1 1/2 turns out from seated position is the norm and some adjustment may be needed once running either in or out till runs smooth.
motorcraft fl-400 can buy at walmart
If it has a plastic intake manifold there is your culprit. The flanges warp and produce vacuum leaks and all three.
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