I have 200 Hpdi thatseems to run great at times but terrible others. I have changed the plugs, gas filter, vst screen, filter can above vst, gas primer ball... Nothing seemed to help, even ran on six gallon can to eliminate gas issues. When running bad will nt go over 3800 rpms and looking at motor from prop sidi the middle plug on the right and top plug on left does not make a diffence if on are not. By turning off the key and restarting it may run fine and I mean come out of the hole, never miss, run 5500 rpms for as long as run leave it running. Once you turn it off you have a 50/50 chance if it will run good or bad. Any sugestions, I like trying to fix it myself but this one has me stumped.