i own a 2001 lt-f250f (4WD) and i just installed a snorkle. now it bogs down and hesitate to move. i thinks it needs to be rejeted but the spark plug looks ok.if it does need to be rejet what size jet do i need? thank you

 

It sounds like the snorkel has restricted the amount of air reaching the carb. This would cause a rich condition which sounds like what you described.

I'd double check to make sure the airway isn't restricted. If everything looks ok, I'd try a leaner main jet. My 2000 LT-F250F came stock with a #117.5 main jet. Whatever you do, don't go too lean. Go down one size smaller on the main jet, and test. If that doesn't fix the problem, then repeat. Your dealer can tell you the next smallest size. It's better to run a little rich than too lean.

You didn't mention any problems starting your machine after the engine is hot. If you see these symptoms, try turning the air/fuel mixture screw in 1/2 turn.

Hope this helps.
Mark