i hav a suzuki rm85, 03 model.when i try to start the bike it will not start first time as it usualy does, it takes a while to start and when it does start lots of white smoke comes out of the exhaust and when i give it some revs it loses power, if i tried to put it in first gear it jst loses all power and conks out.thick white smoke comes out the exhaust when ever i rev the bike.I have put the rite fuel mixture in and recently had a new spark plug and the air filter cleaned.do u have any suggestions? thanks.