thanks buchtes i`ll do that ! i have it running alot better now. i have a test stand i use to break in small motors but the 91 won`t fit in it so i cut a hole in the 3/4 plywood that i mounted everything on & bolted the 91 down. the problem was that the mount for the smaller engines is about 1 1/2 inches taller than where the 91 mounted. so guess what?the fuel tank is 1 1/2 inches higher than the carb on the 91. not good!! i mounted the tank on the 3/4 plywood also, it runs good now. the idle is a little rough so i think i`ll try the different plug that buchtes suggested. thanks for all your help!! conk