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Spark plug burnt tip

Mk7tsi3door

Go Kart Newbie
Location
Nova Scotia
This normal?? Lol I can’t remember what they looked like when I replaced them first at like 60k/klm(37k miles) and now I’m replacing them at 110klm. Unitronic stage 1, no issues at all. Also note the sludge stuff where the crush ring is near, this was the only plug with it, not concerning eh? I figure it’s just gunk that got pulled into the threads from outside, not an oil leak from in the cylinder.

FYI the plugs are NGK 94833 just stock “coldness” I believe
 

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Mk7tsi3door

Go Kart Newbie
Location
Nova Scotia
Alright cool thanks, I think I’ll change them a bit earlier next time, maybe try the rs7 plugs. Just looked a little strange to me but it works fine still!
 
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