Only three things go into starting an engine: fuel, air and spark. First, check your spark plugs for damage or fouling, replacing them if necessary. If they're all good, you need to take the carburetors out and check the jets for any kind of muck or obstruction. Clean them and shoot some pressurized air through the thin end. While you're there, drain and clean your float bowls. As for air, if it's a single cylinder, check the valve shim for wear, as these go every 30,000km or so. You should be able to find tutorials for your bike online.

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