<HTML>2 posibilities:
1. I'm don't know if a spree has an oilpump to spray the oil into the mix or if it uses an oilmix, but if it has an oilpump it could be opened up too wide, so the mix will be too damped.
2. More probable, your feulmix is either way to rich or way to lean (probably rich if the plug is wet), so you need to buy a couple of jets of different sizes and try with wich zise the mixture is good. (1 jet is about $2.--)
If your sparkplug is:
- white with deposits, you've got too much oil in the mix
- grey or white (but clean), you're mix is too lean
- black, you're mix is too rich
- black, damped and with carbondeposits, you're mix is way too rich and there's too much oil in the mix.
Because a 2-stroke gets it's mix through the carter, it takes a while for the new mix from the carb to reach the cylinder, so the changes you make to the carb will have a delayed effect.</HTML>