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Got a similar question on what is max temp to watch out to avoid busting the engine, Ive measured temp after 45 min at the spark plug, it read 400F - using a trail tech computer that has a ring installed in the spark plug. Warrior 350 03.

Hi all, the pic below is from my YFM 03, recently bought, the rubber coupling cracked and engine stops when idle plus the other problems as air gets in/out. Went online to look for the replacement and the tech diagrams show a different part. Dnt know if the previous owner changed something or...