Reply To: Jetting a GT125R – 2017 ..?
I don’t know about you but damn , that white center isn’t good, it suggests bike is leaning out full throttle.
Here is a picture of an old customer of mine , his bike as factory brand new. He did not touch anything and he is the only owner.
The carb was 3 to 4 turns from factory , standard jets, everything was standard on the bike. No mods.
It was annoying to start in winter sometimes.
Threads of spark plug is a bit yellow ish = engine hot (a tiny bit too hot)
oily threads = crap gasket inside rocker cover.
ARCH of plug is okay = piston chamber heat is okay.
Center is brown ish = seems okay full throttle
Circle Ring is black, sooty = rich idling.
Next below is one of my old laser plugs. I was OCD with the bike , i got a little obsessed with trying to get an “ideal brown color” on the plugs.
These plugs are 2 years old.
