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The spark plug gap should be .028″ or .7mm

Hope this helps.

Brad

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According to the Owner`s Manual, the recommended type of spark plug is BPR6ES (NGK) 98079-56846 (Pressure washer applications) or BPR5ES (NGK) 98079-55846 (All other applications). The gap is 0.028″– 0.030″ and the socket size is 13/16″ (21mm).
Replacement Plug

The Craftsman 4.5hp mower uses either a Champion model RJ19LM or J19LM spark plug, or equivalent, with the gap set at . 030 inch.

The gap setting is different for each vehicle but most are somewhere between 0.028″ and . 060″. Consult the owner`s manual or Champion ® catalog to find the recommended setting for the vehicle you`re working on.
A: This spark plug should have a gap set to 0.02 inches.
One of the key factors that makes a spark plug work well, or not, is the size of the gap between the electrodes. If the gap is too small, the spark will likely be too weak and cause the engine to run poorly or with poor efficiency.
The incorrect plug gap for your engine can contribute to a high rate of misfires, loss of power, plug fouling, poor fuel economy and accelerated plug wear. It is always best to check the gap against the manufacturer`s specifications.
Spark plug gaps for car engines are typically 0.6 to 1.8 mm (0.024 to 0.071 in). Modern engines (using solid-state ignition systems and electronic fuel injection) typically use larger gaps than older engines that use breaker point distributors and carburetors.
The larger the gap, the more voltage is needed to jump the gap. Most experienced tuners know that increasing the gap size increases the spark area exposed to the air-fuel mixture, which maximizes burn efficiency.
But if the spark gap is too small, there won`t be enough room for the airfuel mixture between the ground electrode and center electrode. So when the spark plug fires, there`s a possibility that nothing ignites. A wide gap between the center electrode and ground electrode allows for a strong, clean burn.
The spark plug gap widens bit by bit as the electrode wears, so high discharge voltage becomes necessary and misfire occurs more easily.
At the top of the list, we have the NGK Spark Plugs. With iridium as its core material, this spark plug pack can operate at a much wider heat range as compared to ordinary spark plugs made out of platinum or copper.
If a spark plug is too long, it can protrude into the combustion chamber and hit the piston or a valve. This could not only shatter your spark plug into the piston, but shatter the piston itself or damage the head. A spark plug that is too short will cause your engine to buck.
How Do I Gap A Spark Plug? For a low boost application *(under 15 psi) you will want to gap your spark plugs 0.028″ – 0.032″. For high boost applications *(15+ psi) you will want to gap your spark plugs 0.018″ – 0.022″.
Gap between two electrodes of the spark-plug used in an automobile engine is 1.25 mm.
Gap between two electrodes of the spark-plug used in an automobile engine is 1.25 mm.
How Do I Gap A Spark Plug? For a low boost application *(under 15 psi) you will want to gap your spark plugs 0.028″ – 0.032″. For high boost applications *(15+ psi) you will want to gap your spark plugs 0.018″ – 0.022″.
Gap between two electrodes of the spark-plug used in an automobile engine is 1.25 mm.

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My Powercraft 9686 pressure washer has always been stored in my garden shed. It is 4 years old and when I used it last September the power washer had lost considerable pressure, as it was leaking water.

Can I fix it for a reasonable price?

Thank You.

John O D

ANSWER : Put some silicon spray in inlet/outlet then reattach hoses then run it will proform after a while do this everytime you store it pryer to sroring away………..

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