Which spark plug for a 2005 345 w/Kawasaki fd611v

According to JDparts.com:

Deere Part # M71939 = NGK BMR6A IF your engine is a FD611V-AS01, FD611V-BS01, FD611V-CS01, FD611V-DS01 or FD611V-ES01

OR

Deere Part # M802138 = NGK BPR5ES, IF your engine is a FD611V-FS01

I am 99% sure that both plugs are 13/16".

JimR said:

According to JDparts.com:

Deere Part # M71939 = NGK BMR6A IF your engine is a FD611V-AS01, FD611V-BS01, FD611V-CS01, FD611V-DS01 or FD611V-ES01

OR

Deere Part # M802138 = NGK BPR5ES, IF your engine is a FD611V-FS01

I am 99% sure that both plugs are 13/16".

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13/16 probably is the wrench size for both. They do have different thread lengths I believe which is the biggest difference.

This is the complete engine specs for my 2005 GX-345 if that helps to pin point the correct spark plug

Norcane said:

This is the complete engine specs for my 2005 GX-345 if that helps to pin point the correct spark plug

Kawasaki FD611V
gasoline
2-cylinder
liquid-cooled vertical-shaft V-Twin
Displacement	585 cc 35.7 ci
Bore/Stroke	2.91x2.68 inches 74 x 68 mm
Power	20 hp 14.9 kW
Compression	9:1
Starter volts	12
Coolant capacity	3.3 qts 3.1 L
Point gap	0.030 inches 0.762 mm

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Look on the engine for the identifiers that were provided by JimR

NGK says hex size is different.
Reach is a lot different -- don't use the wrong one.





NGK 7421 BMR6A Nickel Spark Plug

Thread Diameter 14mm
Thread Pitch 1.25mm
Seat Type Gasket
Reach 9.5mm (3/8")
Hex Size 3/4" (19mm)
Terminal Type Removable Nut
Overall Height Bantam
Gap .028" (0.7mm)
Resistor Yes
Resistor Value 10k Ohm
Heat Range 6
Torque Specs
Cast Iron: 18-25.3 lb. ft. Aluminum: 18-21.6 lb. ft.





NGK 7734 BPR5ES Nickel Spark Plug
Thread Diameter 14mm
Thread Pitch 1.25mm
Seat Type Gasket
Reach 19mm (3/4")
Hex Size 13/16" (21mm)
Terminal Type Removable Nut
Overall Height JIS
Gap .035" (0.9mm)
Resistor Yes
Resistor Value 5k Ohm
Heat Range 5
Torque Specs Cast Iron: 18-25.3 lb. ft. Aluminum: 18-21.6 lb. ft.

Norcane said:

The owner's manual doesn't say how often to replace the spark plugs. When I start the engine it runs fine, but the moment I engage the 54" mower deck, the engine runs rough. Sounds like its missing. In time it goes away, but hard cutting grass when the rpm is reduced by half.

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The owners manual states to inspect plugs every 100 hours or yearly - whichever comes first. Checking is simply cleaning, ensuring they’re not cracked or broken, and setting the correct gap. Personally, I replace them yearly as part of the home maintenance kit as it’s cheap enough to do it all.

As for your issue with the PTO engaged, the owners manual states 1) faulty spark plug 2) stale fuel 3) engine rpm too low 4) travel speed too fast 5) debris wrapped around mower spindles.