in my stocker TTR28 in the MGT i like to run inbwtween 250 to 280, but lately its been runnin like a raped ape and struggling to hit 210, ive sealed the backplate, carb, new fuel line etc so its not a leak, i might get a new plug and see what that does, as ive had this OS8 in mine for about 3 gallons lol and its still goin great