Offshoreonly.com - Spark Plug Gap for HP500?

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Offshoreonly.com (https://www.offshoreonly.com/forums/)

- General Q & A (https://www.offshoreonly.com/forums/general-q-20/)

- - Spark Plug Gap for HP500? (https://www.offshoreonly.com/forums/general-q/279145-spark-plug-gap-hp500.html)

242LS

06-21-2012 05:37 PM

Spark Plug Gap for HP500?

Does anyone know what the gap should be for 1999 HP500 carb engines? I just bought Denso Iridium plugs and want to get this right.

Thanks!

LaVita

06-21-2012 05:45 PM

.035

242LS

06-21-2012 05:49 PM

Thanks LaVita.

LaVita

06-21-2012 05:51 PM

No problem.

Unlimited jd

06-21-2012 06:46 PM

Should've asked yesterday!

242LS

06-21-2012 09:31 PM

Quote:

Originally Posted by lil red (Post 3714938)

Should've asked yesterday!

I figured they came pre-gapped. I was talking to I'CE today and he asked me what the gap was supposed to be - got me thinking. It turns out they were all at 0.35 already.

Now I have new plugs, wires, distributor caps and rotors. Looking for lost RPMs.

I'CE	07-21-2012 01:44 PM

thunderbolt IV and V found spec. @ .040 and sterndrives.com has spec @ .030 what gives ?

32hustlin

07-21-2012 08:03 PM

Quote:

Originally Posted by I'CE (Post 3735685)

thunderbolt IV and V found spec. @ .040 and sterndrives.com has spec @ .030 what gives ?

The merc flame arrestors have .035 stamped right on them

jrdonnellyjr

07-21-2012 10:31 PM

Quote:

Originally Posted by 32hustlin (Post 3735805)

The merc flame arrestors have .035 stamped right on them

Doesn't hurt to check.

32hustlin

07-22-2012 11:35 AM

I have a question I just run the mr43 delco plugs what's the selling point with the iridium plugs do they not foul or just last longer

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