Replace AC49 spark plug witha champion plug number

Joe, Factory Lawn Boy SPARK PLUG 614009, replacement plugs champion CJ14, NGK plug # BMR4A.
Check the attached links,instruction and guides, Good luck
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Lawn Boy 10415 Lawn Boy Gold Series Walk Behind Mower 1995 SN 5900001...
614009 Spark Plug
Which spark plug for Lawnboy engine
https://www.shoplawnboy.com/Comergent/en/US/adirect/Toro?cmd=ToroLBOnlineModelLookup

First disconnect the spark plug wire from the spark plug. Then use a socket wrench to remove the spark plug. Install the new spark plug into the cylinder head and reconnect the spark plug wire. The Toro CCR 3650 uses a NGK BPMR4A plug gapped to 0.032".

NO I DONT THE SPARK PLUG IS THE SAME PLEASE CHECK WITHA LOCAL DEALER BEFORE USING THIS PLUG

If it uses a Briggs and Stratton you can get the manual here. Manuals Parts

You answered your in question they are definitely different..a plug hitting the piston can damage or even break the piston just trying to start the blower...replace it like the one removed..good luck

If you're Toro electric blower is slowing down, throwing sparks, or not starting you may need to replace the carbon brushes. Replacing brushes and cleaning commutator early can prevent damage to motor armature!

There are Electric Motor replacement carbon brushes on E-bay for all three motor sizes (7 AMP, 10.5 AMP, and 12 AMP) of Toro Leaf Blowers (Toro Rake and Vac Super and Ultra Blower Vacuums)
Search E-bay for: "Toro Blower Carbon Brush"

- 12 Amp leaf blowers Toro Super (Old model 51552) through Toro Ultra (New model 51609).
- 10.5 Amp leaf blowers Toro Old through Toro New model 51573.
- 7 Amp leaf blowers Toro model 51586 and other Toro 7 amp blowers

Briggs & Stratton Part Number 799876 replaces Champion plug RJ2YLE. For use in Quantum Series 625, 675, and 725 engines built after Date Code 110701xx. The gap for this spark plug should be set to .020". This spark plug should not be used with Quantum Series 625, 675, and 725 engines built before Date Code 110701xx, or any other L-head engine family.

that is the correct spark plug for the unit. i work at a power equipment store where we work on homelites. 90% of the time it wont start or run right is usually carb issues . need to get it rebuild or replaced

If it has not run for awhile, check the brushes. they might need to be replaced. The plug is usually moulded right on power cord. That might have to be replaced because if there is a problem with a broken or disconnected wire right at plug there is no way to see it. Hope this helps.

The Homelite part number for this spark plug is 870174001. This number crosses to Champion spark plug RCJ6Y which can be bought at any Home Depot, Lowes, Ace Hardware, etc for about $3