Plug check

1610 Views 6 Replies 3 Participants Last post by scuzz, Jan 18, 2009

VelociRaptor

Discussion Starter · Jan 16, 2009

Checking the spark plug in actual reality is part science and part art. Takes a keen eye to tune properly solely on sparkplug reading but this is what my plug looked like after a proper dyno tuning and racing one MX race with it:

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VelociRaptor

Discussion Starter · #2 · Jan 16, 2009

This is the tune that it had(this was the difference between the HCII and HCIII camshafts in my build):

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scuzz

· #3 · Jan 16, 2009

To my novice eye that appears rich.

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VelociRaptor

Discussion Starter · #4 · Jan 16, 2009

Its a touch rich because I like to tune the 700 Raptors rich down low because it brings on that large rise in torque between 4000-5000rpm. If I lean it out past 13:1 it goes away. When you ride it with it and without it its very noticeable especially while wheelieing, doesnt come up as fast. This will be something the XX guys will have to play with to see what the XX likes. I like to cross the 13:1 point in the rpm range at 2000rpm before peak hp.

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5W0P3

· #5 · Jan 18, 2009

Mine is DEFINITELY lean. The tip is almost whitish, not black like yours.

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VelociRaptor

Discussion Starter · #6 · Jan 18, 2009

Well, maybe. The burn characteristics of the Honda chamber maybe leaner than the Yamaha, need to get it on a wideband O2 to make sure but it probably is lean with it being whiteish. Did it idle better yesterday?

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scuzz

· #7 · Jan 18, 2009

I bet mine is very white after yesterday, the stock map and the UNI filter.

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