Ticking noise from front of engine area? that stays in sync with revs. As far as i know, this engine doesnt have tappets, uses a gear not chain driven cam and doesnt use a distributor rotor. So thats all my ideas (carried over from 10 years of old commodore engines) done. It started after a day at Barbagall o W.A. running flat out for 3-4 hours. Has also decided to cough & splutter like losing a cylinder in low revs in 1st & 2nd gear, which i understand are run with a retarded spark, whereas no problem in higher gears, with an advancing spark. When i pulled apart the top of the bike, i got as far as taking the airbox off & discovered heavy amounts of fuel & either oil or dirty/rusty fuel sprayed around the chamber. Plugs r clean, Jets r clean, not blowing smoke, backfired twice today. HELP! there is a 2-3 week waiting list for service in perth area.