the small bolt on the side of the head i guess i tighten it to much and it cracked so i swaped out the head from a83 trike it runs, starts right up revs good, down hill goes throught all the gears good but as soon as i get to a little bit of a grade it bogs down i have to shift down to first to get up the grade..engine isnt reving it sounds like its trying to make power this thing sat for 3 years soo i dont know if i did somthing or what