Reply To: Old gt250 Comet 2006, Perth W.A.
Well damn! I hope it gets sorted out. A new tensioner is always a good call! – Also new cam chains if they have worn down that much considering the mileage , it is almost time to rebuild the bike little by little.
Welcome to the forum, be sure to post a picture of it 😉
Carbs = 2.5 full turns out on each pot and leave them there forever , it lets you focus on other areas on the carb to fine tune it well 🙂 (also compression on the cylinder pistons or valves is very crucial )
Or watch for the rubber valve seals may drop the odd oil in to the pistons and making the spark plugs extra sooty or oily , so look at your spark plugs
You got this!