Nitrous spark plug info

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Originally Posted by pl4yboy

I'm fairly good at reading the timing mark and rich/lean... How do you decide to go up or down a heat range?

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Looking at the outside threads and the heat mark it leaves on them... should only be on a few threads. If it goes all the way to the base, you need colder plugs. It may take a few passes/hits to show this.

Quote:

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Originally Posted by PurpleMinivan

Looking at the outside threads and the heat mark it leaves on them... should only be on a few threads. If it goes all the way to the base, you need colder plugs. It may take a few passes/hits to show this.

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That's what I thought. It also means 6's are the correct heat range for me. I'm showing 3 threads.

How does it go the bigger the number the colder or opposite?

Correct.