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Old 03-22-2014, 07:00 PM   #1
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Default OS 12 xz air gap

Hi, trying to get my 12xz in the correct ballpark for the upcoming racing season. I'm confused about the air gap. The OS 12xz manual states that the air gap is 0.5mm with the reducer removed. I found a body clip that is exactly 1mm and it easily fits in the gap I have with the reducer out. A friend of mine also has a 12xz and I compared our air gaps and they looked approximately the same. Our engines seem to be running ok, but I was having an issue where the idle wouldn't come down right away after a WOT run. I don't have a mechanical linkage issue and the gap isn't absurdly open.

If you run the reducer, should the air gap without the reducer be about 0.5mm? I do run the reducer (you're supposed to right??)
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Old 03-22-2014, 11:40 PM   #2
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When your idle takes too long to come down after going WOP, your bottom is too lean
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Old 03-23-2014, 08:07 AM   #3
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When your idle takes too long to come down after going WOP, your bottom is too lean
maybe fault idle setting,too rich of bottom with high idle
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Old 03-23-2014, 08:19 AM   #4
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maybe fault idle setting,too rich of bottom with high idle
I was kinda thinking this too after reading some more info.

Just seems that if I lower the gap WITHOUT the reducer, there is going to be 0 gap with the reducer in (is that normal?)
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Old 03-23-2014, 09:35 AM   #5
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I was kinda thinking this too after reading some more info.

Just seems that if I lower the gap WITHOUT the reducer, there is going to be 0 gap with the reducer in (is that normal?)
i never measure the gap,as long as the idle can stable more than 10 second and i never run without the reducer.
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