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SOURCE: What spark plug should be used for a Murray Quantum XNP 6.5hp mow
Home Depot has the plug you need for briggs 6.5hp engines. Don't worry about it being a Murray. Buy a Briggs 6.5hp plug.
Hello again Joyce.
Do exactly what I say and you will save yourself money in the future
Find the carburetor... look for 2 adjustment needles. If there is a red and white plastic caps on them, remove them, throw away. Theye are put on by the factory for epa reasons only.
Have a flashlight handy... on the carburetor look for a H and an L... these are the high and low needles...
To adjust the low, which is only for idle only... start the unit up , let it idle, if it's not idling well, then adjust the L needle in quarter increments only...
The H needle you adjust while holding in the trigger while turning the needle in quarter increments...
So to start off, turn both clockwise units snug not super tight... then back both out 1 whole rotation.
This is your starting point...now you can proceed to adjust as needed....
Sounds like fuel problem. You may want to check the vent on the fuel tank. It can get clogged and won't provide enough fuel to run at higher rpms. I'm not familiar with that engine, but its a problem I've had in the past with weed eaters and chainsaws.
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