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Nitro engine experts?

1K views 1 reply 1 participant last post by  BundyRacer 
#1 · (Edited)
Hey guys
today i ran my werks B7 .21 pro engine for about a tank or 2. just cause i felt like running it before taking it out of the car and finding a roller to put it in. anyways i took the glow plug out to put about 5 drops of after run in the top and i noticed when i look into the engine the top of the piston is black and looks a little rough. im just wondering if that's normal? What it looks like is burnt fuel? which is nothing to worry about,but im not entirely sure thats why i am resorting to asking you guys. the engine has probably only seen 10litres as the previous owner stated. I'm fair sure that's normal but thought i would ask. As this engine is expensive! and i don't want to spend another $500 lol. so a little worried haha
Once the after run was put in you couldn't really tell
any help will really help a lot!!
and thought id mention the engine runs great! cheers
matt
 
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