Name: CPR7EA-9 | PLUG, SPARK (CPR7EA-9) (NGK) (MSX125 / GROM125 / CLICK125 / PCX125-150...)
Brand: NGK
SKU: CPR7EA-9
Price: 205 THB
Availability: InStock

Description

● If you have a big bore installed, then we strongly recommend to install the NGK CR spark plug type (such as the CR9E LINK or the iridium version CR9EIX LINK) instead of the stock/standard NGK CPR type, since the shorter Non-Projected CR ground electrodes are less prone to detonation compared to the longer projected CPR electrodes.

If you have a dome piston then the shorter electrode will make the install also easier by lowering the risk of piston contact.

● STANDARD NICKEL (OEM) vs G-POWER (PLATINUM UPGRADE) vs IRIDIUM IX (THE ULTIMATE UPGRADE)

We offer the standard OEM plugs, but we also stock the high-performance upgrades. Here is why you should consider moving up the ladder:

● Standard Nickel (OEM)

The baseline for reliability. Features a copper core for heat removal and a nickel alloy electrode.

Verdict: Solid performance for daily use and standard service intervals.

● G-Power (Platinum Upgrade)

The smart "middle-ground" upgrade. These feature a fine platinum tip welded to the center electrode.

Benefit: The finer tip requires less voltage to spark, leading to faster starts and quicker acceleration than nickel.
Verdict: An economical performance boost.

● Iridium IX (The Ultimate Upgrade)

The gold standard for tuners. Iridium is significantly harder than platinum, allowing for an incredibly fine center electrode.

Benefit: Extremely stable spark at high RPMs, superior anti-fouling, and the longest lifespan.
Verdict: Highly recommended for high-performance builds where consistency is key.

● TUNERS KNOWLEDGE: PROJECTED vs. NON-PROJECTED ELECTRODES

This is the most critical section for engine builders.

You will notice some plugs have a "P" in the code (e.g., C**P**R8EA), and some do not (e.g., CR8E). This indicates whether the electrode is Projected or Non-Projected.

● Projected Electrode (The "P" Type)

The insulator and electrode extend further into the combustion chamber.

Good for: Stock or mild engines. It places the spark closer to the center of the mix for efficient burning.

● Non-Projected Electrode (The Tuner's Choice)

The electrode sits further back, flush with the end of the threads. Yuminashi strongly recommends Non-Projected plugs for high-compression builds.

● WHY CHOOSE NON-PROJECTED?

Piston Clearance: With high-compression Dome Pistons, space is tight. A projected plug risks physical contact with the piston, which is catastrophic. A non-projected plug provides essential clearance.
Reducing Knock (Detonation): A long, projected electrode acts like a heat sink in the combustion chamber. In a race engine, it can start glowing and ignite the fuel before the spark fires (pre-ignition). The shorter, non-projected electrode stays cooler, significantly reducing the risk of engine knock.

● MULTI-GROUND (DOUBLE) ELECTRODES: Reliability First

For riders prioritizing absolute ignition reliability, we offer the Multi-Ground series (e.g., CR8EK | CR9EK | CR10EK).

These plugs feature two ground electrodes rather than one.

The Benefit: The spark will always jump to the best path. It does not create two sparks at once, but it provides a "backup" path.
Longevity: Because the wear is distributed between two ground straps, the gap grows much slower than on a standard plug. This puts less strain on your ignition coil and ensures consistent firing over a longer life.

● GENUINE NGK 3901 CPR7EA-9 NICKEL SPARK PLUG

Threaded Terminal Stud
Corrugated Ribs
Triple-Gasket Sealing Process
Copper Core
NGK's Standard Plugs are Constructed for Longer Life and Optimum Performance.

Trivalent Metal Plating Provides Superior Anti-Corrosion and Anti-Seizing Properties
Corrugated Ribs Prevent Flashover
Pure Alumina Silicate Ceramic Insulator, Provides Superior Strength and Better Heat Transfer
Copper Core Aids in Heat Removal
Triple Seals Prevent Leakage

● SHELL:

Thread Size: 10mm
Thread Pitch: 1.0mm
Seat Type: Gasket
Resistor: Yes
Resistor Value: 5K Ohm
Reach: 19mm (3/4")
Hex Size: 5/8" (16mm)
Terminal Type: Threaded Stud
Overall Height: ISO
Gap: .035" (0.9mm)

● CENTER ELECTRODE:

Material: Nickel
Type: Standard
Size: 2.5mm
Projection: Projected

● GROUND ELECTRODE:

Material: Nickel
Type: Standard
Quantity: 1

● SPECIFICATIONS:

Resistor: Yes
Resistor Value: 5k Ohm
Torque Specs: Cast Iron: 7.2-10.8 lb. ft. Aluminum: 7.2-8.7 lb. ft.
Brand: NGK
Heat Range: 7
Longevity: 30k

SMART SHOPPER TIP:

   ※ BUYING MORE THAN 1 PIECE CUT THE TRANSPORT PRICE, AND YOU RECEIVE A 10% DISCOUNT ON TOP OF IT!

※ B2B:

Purchases between 2 & 4 pieces of this product will receive a 10% DISCOUNT
Purchases between 5 & 9 pieces of this product will receive a 15% DISCOUNT
Purchases between 10 & 19 pieces of this product will receive a 20% DISCOUNT
Purchases between 20 & more pieces of this product will receive a 25% DISCOUNT
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