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Old 03-29-2004, 02:07 PM
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Join Date: Mar 2004
Location: Staines, UNITED KINGDOM
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Default piston head damage?

I am in the process of breaking in my force 21 engine on my Rex-x, and having run a few tanks of nitro through as per instructions I decided to check the glow plug. In the process I noticed a brown ring on the top of the piston head, is this normal? Or have I cooked the engine? Any help would be appreciated as a newbie I'd hate to think I'd knackerd my engine already![&o]