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According to JD Parts:

X728: (NGK BPR2ES) - M138938
X485: (NGK BPR2ES) - M138938
 

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The x485 should have multiple plug options based on serial numbers. The 4x5 and x4X5 gas engines had a few heads with different plug depths.

Compare length against what you remove
 

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Premium Member
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The x485 should have multiple plug options based on serial numbers. The 4x5 and x4X5 gas engines had a few heads with different plug depths.

Compare length against what you remove
You are correct, there are two different engines shown for the X485. A FD711D and a FD750D. But JD Parts shows the same maintenance kit (LG244) and spark plug for both.
 
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