What did you use seafoam or some BG stuff? I like the BG stuff a lot but just use seafoam a lot since they sell it everywhere now. It sucks it is $10 a can it used to be like $5 years ago when I 1st started using it. Do that then break the plugs loose and spray some Kroil and it will help for sure. I do that even on the 2V motors since the older ones have the stupid 3 thread heads.