Spark Plug - 14mm - BPR7EIX - NGK - Iridium
- Buy 10 for $10.76 each and save 10%
OEM: 4055 - NGK Iridium Spark Plug
Resistor plug for radio interference. Used with caps without resistors. The equivalent to the NGK BP7ES but with an Iridium Plug with a 5k ohm resistor to reduce RFI.
If you need a colder plug use the BPR8EIX
Adds a solid 2 HP to your 650
NGK Iridium Spark Plugs - Cheapest horsepower you can buy for your motorcycle!
While Dyno testing a problem bike (a Yamaha TX750) it was discovered using Iridium spark plugs caused the engine to gain 2 HP. Further Dyno testing on other stock and modified 650's showed the same results! The gain seems to be from improved combustion chamber flame front spread in the 650's old style combustion chamber. The same results were obtained on engines with points, factory TCI, and Boyer ignitions. We determined that the shape and position of the nose and electrode caused the gain and not any enhancement of spark. Smoothing of the dips in the power curve, increased acceleration, reduced fuel consumption and up to 4 times longer plug life can also be expected. Dyno testing performed by Heiden Tuning in Germany.
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