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Sputtering, Quitting Engine

My six-year old Craftsman mower, after gift in winter storage, started up as usual and I promptly cut fifty percent of mine yard"s feather lawn growth. Then it sputtered out. Restarting resulted in only a short burst the power and also then immediately quitting. Just priming the engine (with the thumb-sized rubber throttle) would obtain it to start for these brief moments.

You are watching: Craftsman 6.5 lawn mower spark plug size

I purchase a "Tune increase Kit" native Sears and replaced the waiting filter, spark plug, and also leveled off the oil level with new oil (all that which came in the "kit," along with an additive "fuel stabilizer".) because that a perform of Craftsman mower replaceable parts, with part numbers for this Briggs and Stratton engine, go here.

(1) MY an initial STEP: REPLACING basic DISPOSABLE PARTS

As a matter of year-to-year maintenance, an altering oil, waiting filters and spark plugs is important. On the Craftsman model 917 version it"s likewise easy and also fast, requiring just screwdrivers and also an as necessary sized wrench or socket for the spark plug. Take it a look at this photo listed below showing ar of the air filter and what it looks choose on this specific 917 Craftsman design (called the "22 inch mulcher" on one side). The oil cap is labeled and also the spark plug is obvious.

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PHOTO: wait FILTER changing CRAFTSMAN 917 MOWER: Gas is combined with oxygen for firing within the engine. A dirty waiting filter renders it challenging for the engine to obtain an sufficient supply the the oxygen it needs.

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But still: starting was followed immediately by the engine quitting.

Research ~ above the internet suggested a number of possible problems: carburetor gunk build-up, fuel filter clogged, poor gasoline, no oil, serious inner engine problems.

(2) step TWO: exploring WITH A VALVE

How I addressed my details issue: i took the cosmetic plastic top off my Craftsman mower, and then I began the engine again, and also kept the going (weakly) by continually "thumbing" gas to the engine making use of the primer-throttle. I noticed there is a plastic valve i m sorry opens and also closes. Ns attempted to manipulate this valve by flicking it open, closed, holding that halfway, etc.,with the finish of a screwdriver, to just see what difference it made. The made some difference however not sufficient to save the engine going.

PHOTO Below: place of the valve on the Craftsman 917 model Mower

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Water in gas?

Based upon what i was observing v the engine behavior, there to be something happening in between the primer, the valve, and the gasoline. So, to make specific the difficulty wasn"t just gas v water in the (water deserve to condense into the container that gas because of weather changes) ns retrieved mine plastic oil-pan reservoir which I use for recording oil as soon as I execute an oil adjust on one auto, tipped the Craftsman mower sideways and poured out all the gas from the tank. Ns then placed in new gasoline which had not been sitting for a lengthy time (i.e., has not gone "sour").

The mower then began as normal from the primer, ran a little stronger 보다 it had actually been, yet still coughed and also quit. I restarted and forced the plastic (rubber?) fuel valve to stay open up using a screwdriver. The mower keep going, though no with full power. I let the die, restarted the again, and also continued to hold the valve open. ~ a half-dozen starts-and-stops, i noticed a change: when I released the valve from being compelled open, it would certainly waver ~ above it"s own and also then close, at which allude the engine would then roar to complete power.

PHOTO below: valve compelled open on Craftsman 917 design Mower through a Briggs and also Stratton engine. I used the finish of a screwdriver to push the valve open.

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Success

I had actually the engine quit, then ns restarted the engine. That sputtered and threatened to quit: I required the valve open up again, it improved, ns released the valve and also it roared to common power.

I then cut my grass, stopping around halfway through the procedure and restarting the engine to watch if it would certainly sputter, however instead the performed precisely as the should: whatever was in the fuel, even if it is water, or some sort of buildup inside the fuel line or approximately the valve, had been cleared.

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Craftsman Lawn Mower source Help

Other resources for help: below is a friend Tube video with a basic primer on an altering out disposable parts on a Craftsman Mower.

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An online You tube Video

Another resource of help: A great outline of exactly how to resolve diaphragm and carburetor issues on a Craftsman mower is at the gardenweb online. Big photos and well composed instructions.

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