first go look in the NTC3 thread and find the info about the tank pressure rework for the lid.
The other issue is the fuel foaming issue. I know what is causing it and I am working on a solution. The problem is the chassis is weak where they cut out the access hole for the pull start clearence. That section of the chassis vibrates bad because of this. I put a new mounting system in mine with a serpent Impulse tank and it got better but it is still not good enough. I kinda went from high wash cycle to low but it still vibes bad enough that it will spit fuel out the tank fill hole because it vibrates the lid to death.
Just here to give the world grief.