NGK 3993 spark plug for the 1979-2006 Honda CR125R 124cc, the 2007 CR125R 125cc and other vehicles ignites the fuel mixture in the cylinder and is one of the NGK spark plugs made for racing. It is recommended for racing use only.
- Conventional nickel alloy center electrode for consistent performance
- NGK Racing line configurations and designs for durability and ignitability
- High grade alumina silicate ceramic insulator for optimal dielectric performance
- Solid copper core, 98% pure copper, for heat dissipation, conductivity and ultra wide heat ranges
- Cold-rolled threads that prevent cross-threading and damage to cylinder heads
- Trivalent metal plating for anti-corrosion and anti-seizing properties and easier installation and removal
Quick facts
- Part: NGK 3993 spark plug
- Fits: 1979-2006 Honda CR125R 124cc, the 2007 CR125R 125cc and other vehicles
- Condition: New
A worn or fouled plug can show up as hard starting, misfires or a ragged pull, and a tired electrode is easy to spot with the engine off and cool. The plug cap, ignition coil and fuel delivery can be behind the same symptoms, so track down the real cause before you buy.
Fits
The 1979-2006 Honda CR125R 124cc, the 2007 CR125R 125cc, the 1978-2007 Kawasaki KX250 249cc and the 1978-2007 Honda CR250R 249cc all take this plug, and so do more vehicles. Each takes one per cylinder. If your bike is not named here, look it up in the "Vehicles it fits" section, where the other models are laid out by year and engine.
Specifications
Fit and size
- Thread: M14 - 1.25
- Thread reach: 0.750 in (19.0 mm)
- Hex size: 13/16 in
- Gap: 0.024 in (0.6 mm)
- Heat range: 10
Build and materials
- Center electrode: conventional nickel alloy
- Core: solid copper
- Insulator: alumina silicate ceramic
- Plating: trivalent metal
- NGK part number: BR10EG SOLID
- Condition: New
Interchange: BR10EG SOLID
Frequently Asked Questions
Is this a KX250 spark plug that fits the 1978-2007 Kawasaki KX250 249cc?
Yes. NGK 3993 fits the 1978-2007 Kawasaki KX250 249cc, one plug per cylinder. For another model, look it up in the "Vehicles it fits" section.
Does the 2007 Honda CR125R 125cc take the same spark plug as the 1979-2006 CR125R 124cc?
Yes. NGK 3993 is listed for both the 1979-2006 Honda CR125R 124cc and the 2007 CR125R 125cc.
What thread size and gap does the NGK 3993 have?
The thread is M14 - 1.25 with a 0.750 in (19.0 mm) reach, and the gap is 0.024 in (0.6 mm). The hex size is 13/16 in.
Is this racing spark plug meant for everyday street riding?
No. This spark plug is recommended for racing use only. Its center electrode is a conventional nickel alloy.
Is BR10EG SOLID the same plug as NGK 3993?
Yes. BR10EG SOLID is NGK's other number for this plug, so a listing under either number is the same spark plug.
