Originally Posted by pommie john
Any reason you can't run a spacer ( thick washer ) on the plug so you can use a long reach plug in the short reach hole?
We used to use copper spacers when I was racing Yamaha 2 strokes.
Cutter mentions this. He also states it should not be done long term but as a stopgap only. Screws up the heat range. Also two gaskets to leak instead of one (my own thought). He gives the dimensions and says Honda dealers carry them.