Hi all
Can somebody tell me the correct spark plug for my JD 430C
It had a champion J8 in it but i suspect its wrong?
My research came up with mixed results
JD 430C - Spark Plug
JD 430C - Spark Plug
JD 430C serial 145871 from New Zealand
- Stan Disbrow
- 350 crawler
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Re: JD 430C - Spark Plug
Hi,
Champion plug number is H-10.
I use Autolite 216 plugs myself.
Stan
Champion plug number is H-10.
I use Autolite 216 plugs myself.
Stan
There's No Such Thing As A Cheap Crawler!
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Have: 1950 M, 2005 x495, 2008 5103 (5045D), 2025 3025E
Useta Have: '58 JD 420c 5-roller w/62 inside blade
Useta Have: '78 JD350C w/6310 outside blade
Useta Have: '68 JD350, '51 Terratrac GT-25
Have: 1950 M, 2005 x495, 2008 5103 (5045D), 2025 3025E
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Re: JD 430C - Spark Plug
Here is the info from the parts catalog. Your local parts store should be able to cross the numbers to the brand you prefer. I use NGK brand for the most part now.

Re: JD 430C - Spark Plug
I received the Champion H10C
The Key Difference: A Copper Core for Enhanced Performance
The primary distinction between the Champion H10 and H10C spark plugs lies in the material of their center electrode. The H10C features a copper core, a design enhancement over the older H10 model, which significantly improves the spark plug's performance and durability.
The "C" in H10C specifically denotes "Copper Plus," Champion's designation for plugs with this copper-cored center electrode. This innovation offers several advantages:
Improved Heat Control: Copper is an excellent conductor of heat. The copper core in the H10C allows for more efficient heat dissipation from the firing tip, preventing overheating and extending the life of the spark plug. This wider heat range makes the H10C more adaptable to varying engine loads and conditions.
Enhanced Conductivity: The copper core provides a path of lower resistance for the electrical current, resulting in a stronger and more consistent spark. This can lead to more complete fuel combustion, improved starting, and smoother idling.
Increased Durability: Better heat management reduces the risk of pre-ignition and fouling, contributing to a longer service life for the spark plug.
Essentially, the H10C is the modern, improved replacement for the now largely obsolete H10. While both spark plugs share the same physical dimensions—including thread size (14mm), reach (7/16 inch), and hex size (13/16 inch)—making them interchangeable in most applications, the H10C offers superior performance and reliability due to its copper core technology.
For those undertaking period-correct restorations of vintage vehicles, there may be minor cosmetic differences, such as the number of insulator ribs or the color of the metal shell. However, for practical use in vehicles and small engines that specify an H10, the H10C is the recommended and readily available successor.
The Key Difference: A Copper Core for Enhanced Performance
The primary distinction between the Champion H10 and H10C spark plugs lies in the material of their center electrode. The H10C features a copper core, a design enhancement over the older H10 model, which significantly improves the spark plug's performance and durability.
The "C" in H10C specifically denotes "Copper Plus," Champion's designation for plugs with this copper-cored center electrode. This innovation offers several advantages:
Improved Heat Control: Copper is an excellent conductor of heat. The copper core in the H10C allows for more efficient heat dissipation from the firing tip, preventing overheating and extending the life of the spark plug. This wider heat range makes the H10C more adaptable to varying engine loads and conditions.
Enhanced Conductivity: The copper core provides a path of lower resistance for the electrical current, resulting in a stronger and more consistent spark. This can lead to more complete fuel combustion, improved starting, and smoother idling.
Increased Durability: Better heat management reduces the risk of pre-ignition and fouling, contributing to a longer service life for the spark plug.
Essentially, the H10C is the modern, improved replacement for the now largely obsolete H10. While both spark plugs share the same physical dimensions—including thread size (14mm), reach (7/16 inch), and hex size (13/16 inch)—making them interchangeable in most applications, the H10C offers superior performance and reliability due to its copper core technology.
For those undertaking period-correct restorations of vintage vehicles, there may be minor cosmetic differences, such as the number of insulator ribs or the color of the metal shell. However, for practical use in vehicles and small engines that specify an H10, the H10C is the recommended and readily available successor.
JD 430C serial 145871 from New Zealand
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