2023 Klx300D. 20500 miles. Haven't checked the valve clearance since new. Shop wants it for 3 weeks due to backlog. So choices are learn to check it asap, check it in winter with another 3000 miles, or I don't know buy a 2nd bike n give it to the dealership for 3 weeks after all? Not even close to a race bike and starts/runs fine. Will I be cooked in another 3000?