Denso Spark Plug - HOT Alternative to NGK
Denso Spark Plug
- these plugs are designed hotter in the ceramic insulation design, making for a "hotter" plug in the sense of them being better fit to "burn" otherwise foul cylinders free.
Always worth a shot should you have any 4stroke with one or more rich cylinders that give you trouble.
These may be all you need to push the motor in the right direction.
And should all fail you can start to increase the plug gap tiny bit by bit to create a more aggressive spark.