guys i need some help again. when i drive my 3 wheeler it runs like crap (slugish) until you pin the gas then it clears up. what could it be? it lets out exhaust that smells like a tractor pull. someone told me its running rich. if its any help it back fires when i give it gas. the air screw is set 2 1/4 turns out. that is what the book says to set it at.
i am begging you guys i need help. it seems like every time i get it running it takes a crap again.