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Originally Posted by TGrits10
Alright then, just ordered up a set of 97968s. Any need to mess with the gap or is that a topic for later (i.e. Stage 1 tune)?
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You want to keep the gap as close to stock recommendations as possible. The smaller the gap the less energy. People gap down because higher boost has a tendency to "blow out" the spark if gapped too wide on our cars, which is why people gap it down to 0.018-0.022. For stage 1 I wouldn't gap it down that far. I am at 0.025 on BMS map 2 with E30 and I have no issues.
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Just checked with NGK directly and the 97506 is the OEM replacement spark plug they recommend for a stock 2015 650 GC.
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This is surprising as everything I have read, including recommendations from Burger, says that they are two steps colder than stock. I wonder if anyone will chime in that is running them on a stock motor, but I wouldn't do it.