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post #1 of 4 Old August 5th, 2012, 06:50 AM Thread Starter
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spark plug gap

What do you set the gap to?
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post #2 of 4 Old August 5th, 2012, 07:03 AM
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Re: spark plug gap

Originally Posted by Blackbelt View Post
What do you set the gap to?
Depends on which type and model of plug your using...

Some plugs are pre-gapped and you DON'T gap them...

You might want to purchase or download the service manual for your ride... It'll answer all your maintenance questions... Then you can have the info every time you need it...


Since the gap size has a direct affect on the spark plug's tip temperature
and on the voltage necessary to ionize (light) the air/fuel mixture, careful attention is required. While it is a popular misconception that plugs are pre-gapped from the factory, the fact remains that the gap must be adjusted for the vehicle that the spark plug is intended for. Those with modified engines must remember that a modified engine with higher compression or forced induction will typically require a smaller gap settings (to ensure ignitability
in these denser air/fuel mixtures). As a rule, the more power you are making, the smaller the gap you will need.

A spark plug's voltage requirement is directly proportionate to the gap size. The larger the gap, the more voltage is needed to bridge the gap. Most experienced tuners know that opening gaps up to present a larger spark to the air/fuel mixture maximizes burn efficiency. It is for this reason that most racers add high power ignition systems. The added power allows them to open the gap yet still provide a strong spark.

With this mind, many think the larger the gap the better. In fact, some aftermarket ignition systems boast that their systems can tolerate gaps that are extreme. Be wary of such claims. In most cases, the largest gap you can run may still be smaller than you think.

Last edited by swingarm1; August 5th, 2012 at 07:12 AM.
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post #3 of 4 Old August 5th, 2012, 07:13 AM
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Re: spark plug gap

Install NGK Iridium plugs, #BKR7EIX, and DON'T re-gap them! They'll probably out-last your engine. My two-bits.............

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post #4 of 4 Old August 5th, 2012, 09:23 AM Thread Starter
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Re: spark plug gap

This is going in a 170. I have an ngk plug already but not an iridium. That plug you listed fits the 800 and is what i use in mine.

Btw i had a pdf service manual but the computer crashed and i am not going to buy again. I am sure someone will eventually post a link to a 170 manual again. I already found the one for mine again for free.

Last edited by Blackbelt; August 5th, 2012 at 10:30 AM.
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