I just picked up a 98 FormulaIII 600 with 2200 miles on it. I ran it at the guys house, it ran great and had tons of power. When I got home I decided to take it out on the lake and blow it out. I got mabye a mile into it and it just started bogging really bad as if it were only running on 1 cylinder. I limped it home and it died in the driveway. I pulled the plugs to find not only did it have BR7ES plugs in it but the middle plug was extremely dry and grayish while the other 2 were full of carbon and extremely wet. Should I be worried here or will it be fine with the proper plugs in it.
Thanks
John[/b]
I would do a compression test , sounds like you might of burned up the middle cyclinder. Those sleds were knowen for crank bearing going out too. Did the pervious owner have the update done?
Middle cylinder was running lean from your discription of the plugs. Pull the plugs and roll the center cyl up to top of the stroke and look down in it to see if theres a hole in the pistion, any type of melting on the plug tip or metal pcs ?.Could be a clogged carb to making it run lean , check for air leaks(boots).As for the plugs even if they where the wrong ones but were firing I would be worried about the colors of them , the white/gray one over the black ones. the lighter the color the hotter(lean cond) , black not so bad at least your getting lube to the cylinder.
It stinks after buying a used sled and it goes south as soon as you ride it , you never know :bash:
mutt