125-200cc Too low squish?!

So, i've reduced the squish on my sm 125 '07 to exactly 1mm and it ran good since now. My spark plug failed, it never happened again so i blame it on the squish? The end of the spark plug burned off. Is the squish too low or has anyone experienced the same problem? Are you using different spark plugs?

Btw it has tmx38 with
400main
35pilot
4.slide
Needle on 3rd notch

A 400 main is pretty lean for a 125 are you sure that the plug didn't fail because of a lean main jet? My 125 needed a 450 main. Can you post a picture of the spark plug?

Im pretty sure its good right now, theres like 35 degrees celsius, tries 410 and the spark plug was really black. I will post a picture of it when i find the old one.

1 mm squish is fine. The problem is elsewhere

400 in the older TMX is like running a 480 in the new TMXX.

Checked the new spark plug i put in, theres something horribly wrong...

It is the old version

Ignition point?

jeanjean

What plug are you using?