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B & S 450E weedeater push mower. Changed plug, still no spark

#1

T

Talltree

New plug, no spark, B & S 450E weed eater push mower


#2

Scrubcadet10

Scrubcadet10

remove the engine/flywheel cover, remove the 1 small kill wire from the coil, recheck for spark.


#3

flyhalhl@gmail.co.

flyhalhl@gmail.co.

Scrubcadet10 said:
remove the engine/flywheel cover, remove the 1 small kill wire from the coil, recheck for spark.
Click to expand...
Might be easier at carburetor throttle control or switch as first test for ground which kills ignition


#4

Scrubcadet10

Scrubcadet10

flyhalhl@gmail.co. said:
Might be easier at carburetor throttle control or switch as first test for ground which kills ignition
Click to expand...
unplugging it at the ignition coil ensures the insulation is not broken and the kill wire isn't grounded to the frame etc.


#5

T

Talltree

Scrubcadet10 said:
remove the engine/flywheel cover, remove the 1 small kill wire from the coil, recheck for spark.
Click to expand...
removed wire. Now have spark. Now what?


#6

ILENGINE

ILENGINE

Talltree said:
removed wire. Now have spark. Now what?
Click to expand...
That means that either the wire has a bare spot and is making contact with the engine shorting out the wire, or the kill switch itself has failed. And seems like that has the newer style momentary switch not the grounding tab style kill system, and I have seen a couple of those fail over the last few years.


#7

H

hlw49

Talltree said:
removed wire. Now have spark. Now what?
Click to expand...
Spark plugs don't make spark they just put it in the cylinder and ignites the fuel air mixture in the cylinder.


#8

flyhalhl@gmail.co.

flyhalhl@gmail.co.

hlw49 said:
Spark plugs don't make spark they just put it in the cylinder and ignites the fuel air mixture in the cylinder.
Click to expand...


#9

flyhalhl@gmail.co.

flyhalhl@gmail.co.

hlw49 said:
Spark plugs don't make spark they just put it in the cylinder and ignites the fuel air mixture in the cylinder.
Click to expand...
Chase down the wire to find where center conductor touches ground and kills spark. You have problem in hand. Some sort of grounding device/switch or wire bare some place for OFF. Sometimes putting it back together and "all is well"!


#10

flyhalhl@gmail.co.

flyhalhl@gmail.co.

flyhalhl@gmail.co. said:
Chase down the wire to find where center conductor touches ground and kills spark. You have problem in hand. Some sort of grounding device/switch or wire bare some place for OFF. Sometimes putting it back together and "all is well"!
Click to expand...
Also, you need VOM meter attached to measure for short on wire loosened from coil, and start wiggling things to find what remove the short like resistance of ZERO ohms.


#11

O

Ocean909

Maybe check to see if the bail cable isn't bad. It may not have sufficient tension to disengage whatever kill system is on the mower.


#12

Its Me

Its Me

If you have done all that they have suggested which were all correct, remove the coil, sand or file the two bosses that stick up on the engine and the coil where it connects to them, re set the gap and use a screwdriver inserted into where the plug goes hole it close to the frame to see if it will spark, of course with the kill wire removed and if this does not work it is the coil, they need a surface ground, bolt will not give a proper ground, good luck, Joe


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