my pro never fouled plugs till this season.. i finally got it running right after chasing a exhust manifold leak all season, now it runs GREAT pulls 7700+rpm but i have now fouled three plugs in the back cylinder??? i adjusted the high speed screws a little early season and my wash looks very good when i had the head off last week, but this no wake zone keeps fouling my rear plug. funny part is when i head out to the lake it doesnt foul, when i come back in at the end of the ride is when its fouling?? any ideas on how to solve this? i dont even remember if theres a low speed screws on these carbs??? i assume the screws on these carbs are air screws( IE turn screw open allows more air, runs leaner?) any help would be appreciated!