What size socket would I need to install and remove this part?

It will either be 5/8" (16mm) or 13/16". I'm not sure since it's been 3 years since I installed it. Make sure it's a spark plug socket with the rubber bearing inside though to not only make it easier, but as to not damage it as well. If you have neither of those or don't know what they are, just bring your old spark plug into an auto shop and they can tell you which of the two you need.

Will this fit in a 1980 Honda z50a?

The best method is to use the Amazon lookup for a 1980 Honda z50a. One cannot depend upon an item being a suitable replacement simply because it fits the hole.

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⚡ Ignite your engine’s potential with NGK’s precision spark!

PRECISION FIT SEAL - Flat sealing seat combined with an 18 mm wrench width guarantees hassle-free installation and leak-proof operation.
DURABLE ELECTRODE DESIGN - Nickel-tipped central electrode with solid copper core ensures extended spark plug life.
UNMATCHED HEAT RESILIENCE - Operates flawlessly across a broad heat range to prevent overheating and pre-ignition.
OPTIMIZED THERMAL MANAGEMENT - High alumina ceramic insulator enhances heat transfer and electrical insulation for peak efficiency.
ADVANCED INTERFERENCE SUPPRESSION - 5 kOhm resistor minimizes electrical noise for smoother engine performance.

The NGK Spark Plug 5129 features a nickel-tipped central electrode and a 5 kOhm interference suppression resistor, designed to operate over a wide heat range (Heat Range 7). Its high alumina ceramic insulator improves heat transfer and electrical insulation, while the solid copper core extends plug life. With an 18 mm wrench width and flat sealing seat, it ensures easy installation and reliable sealing, making it a top choice for professional-grade small engine maintenance.

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Great price for an authentic product. Fast international shipping too!

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Manufacturer	NGK Spark Plugs
Brand	NGK
Model	Spark Plug # 5129
Product Dimensions	23.75 x 13.99 x 7.8 cm; 40.82 g
Item model number	5129
Exterior	Chrome
Manufacturer Part Number	DPR7EA-9
OEM Part Number	Honda 98069-57911 / 98069-57916, Kawasaki E92070-1125, Suzuki 09482-00354, Triumph T1290180, Yamaha 94701 00262
Position	Top
Item Weight	40.8 g

NGK Spark plug 5129 Connection version M4 central electrode nickel Interference suppression ground electrode 5 kOhm with flat sealing seat Wrench width: 18 mm Thread length:

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