Pulstar he2rt Spark Plug, (Pack of 2)

Like most plugs, you have to remove the screw on cap for motorcycle use. Unlike other companies, these seems to have thread lock on the caps making them extremely hard to remove. One plug came apart and the cap never unscrewed. I had to return them for replacements.As for performance, these are not a good choice for Gs500's. They cause lots of mis-firing. Maybe the internal capacitor needs more voltage to fire reliably. Maybe the spark plug caps need their internal resistors removed for more power to the plug.I put them in a couple GS500's and wondered why the engine was missing and knocking. I put other plugs in and the engines went back to normal.I found that Brisk or Powermadd plugs perform extremely well in GS500's. Even stock NGK irridium plugs perform better than Pulstar plugs.I have a few GS500's and have tried the various plugs in all of them and find the results to be the same. Therefore, my opinions are not limited to just one set of plugs in one bike.

Hi, want do a up grade for cheap so I brought this plugs for motor cycle and atv.Would recommend this pulse plugs for all your motor toys.You will feel more power and torque for easy installation and a cheap up grade.They have great costumer service so you can order the right plug for your motor.

For a simple type plug and play performance boost. Running installed in a 1997 quadrunner lt160. Don't let the appearance of the spark fool you at cranking time. Most of the performance on this model is felt in the upper rpm range of the engine. Starting is more consistent all together. Engine runs smoother. Seems to have increased the low end torque too. Overall very pleased and will buy again for other applications.

Very nice item! It can't get 5 stars, because of the light button. If u pack it, and presses upagainst anything, it drains your battery.

My son races and i thought i would give these a shot. My son ran a couple of laps and he said he liked them,A little pricey.

A little pricey but improves throttle response and starting. I'm running five xr400 bikes on them and they really seem to help restart after a spill.

Great product. I noticed an immediate increase in gas mileage and a definite improvement in power/performance. As always, they are just spark plugs, easy to install. Make sure you gap them.

First time I tried these plugs and they absolutely worked as stated and delivered as stated (a bit earlier actually).