I do not have a spare 3G3 6 port cylinder anymore, so the old one is put aside and can be re-chromed when money permits....! Fortunately I have a 1H4 cylinder (older type with 4 ports) but that is perfect today. I also use a pair of 1H4 pistons. They are not so good as the 3G3 ones but for my type of riding they will last a longtime I think. Here is the new "power-kit"!

Yamaha TZ350G, new cylinder/pistons/rings