Parts for your 1987 Suzuki Jimny-Spark plugs

1987 Suzuki Jimny Spark Plugs: What They Do and How to Look After Them

For the 1987 Suzuki Jimny, spark plugs are absolutely relevant and used. The ’87 Jimny ran petrol four-cylinder engines (such as the F10A 1.0L in SJ410 and the G13A 1.3L in SJ413/Samurai), which rely on spark plugs to ignite the air–fuel mix. This is supported by Suzuki factory service manuals for SJ410/SJ413 (Ignition section) and major plug catalogues from NGK and Denso listing suitable spark plugs and gaps for these engines.

In this classic Jimny, the plugs fire thousands of times a minute, kicking off combustion so the little Suzuki pulls cleanly on-road and under low-range loads. Good plugs help cold starting, smooth idle, crisp throttle response and better fuel economy—handy whether it’s bashing around the farm or sneaking down a fire trail.

Typical factory-style plugs are copper-nickel, resistor type, with a gap around 0.8–0.9 mm. Common listings include NGK BPR5ES for many G13A 1.3L engines and NGK BP6ES/BPR6ES for some F10A 1.0L variants. Always confirm by engine code and local spec before ordering.

As part of regular servicing, the Jimny benefits from plug inspection every 10,000–15,000 kilometres and replacement of copper plugs about every 20,000–30,000 kilometres. Quality iridium options can stretch intervals further (often up to 80,000 km), but many owners keep it old-school with fresh coppers for reliable spark in dusty, wet and bumpy conditions.

• Tell-tale signs it’s time: hard starting, rough idle, misfire under load, pinging, higher fuel use, or sooty/oily tips.
• Under the bonnet: remove one lead at a time, blow out grit, and crack the plug with the right-size socket.
• Gap: set to the spec for the engine variant (commonly 0.8–0.9 mm) using a wire feeler.
• Install: start threads by hand, seat the gasket, then torque to about 18–22 N·m on an alloy head. Avoid anti-seize on modern nickel-plated plugs (as per NGK technical bulletins), a light smear of dielectric grease on the boot helps sealing.
• Check the leads and cap: per the Suzuki manual, inspect for cracks, tracking and moisture—especially if the Jimny sees river crossings or beach work.

Technical sources: Suzuki SJ410/SJ413 Factory Service Manual (Ignition section, mid-1980s), NGK Asia-Pacific catalogue listings for SJ410/SJ413/Jimny, Denso spark plug catalogue. These specify spark plug types, gaps and service guidance for the 1987 models.

FAQs

What spark plug type and gap suit a 1987 Suzuki Jimny?
For many 1.3L G13A engines, catalogues list NGK BPR5ES with a 0.8–0.9 mm gap. Some 1.0L F10A variants list NGK BP6ES/BPR6ES with a similar gap. Always match the plug to the specific engine code and local spec.

How often should the plugs be replaced?
With copper plugs, a 20,000–30,000 km replacement interval works well, inspecting and re-gapping every 10,000–15,000 km. Premium iridium plugs can go longer if compatible, though many owners prefer frequent fresh coppers for consistent spark in off-road use.

What torque should be used when installing spark plugs?
For gasket-seat M14 plugs in the Jimny’s alloy head, 18–22 N·m is commonly specified. Start threads by hand, seat the gasket, then torque. If no torque wrench is available, use the angle method on new gasketed plugs (seat, then an additional 1/2–2/3 turn), but a torque wrench is best practice.