I use Denso Iridium Plugs right now.. but I think Im going to get some cheaper ones since I hafta change them more frequently with the turbo. I had a couple of questions: I was looking into some NGK the ZFR' _ _?s. What is the gap to set at (36mm?)
How long will the Copper last me compared to the Platinum or Iridiums? Any other recommendations on plugs for my Turbo'd H23a?

 

Since you're running a turbo'd engine, it technicaly runs hotter. Use NGK ZFR6F-11 spark plugs, they are recommended for high heat engines. You can also try ZFR7F. Take those denso's high price tags and shove em' in the direction of where you bought them...

 

Use NGK zfr7f-11 sparkplugs. Gap them at .030"

There is also an NGK plug available at Honda Marine shops, it's the same plug as the one above, except it is pre-gapped to ~.032, and has a different designation.

 

Ya, dont' get the 6f's that's the stock heat range. At least get the 7f's.

Or you can get bkr7e-11. They're essentialy the same, but the tip isn't quite as extended and they're a little cheaper and easier to find.

 

I looked for the ZFR7's but they didnt have them on hand. So I figured Id be ok with the Copper NGK - BKR 7Es and got them
I was gonna gap em to 32mm is this seem right?

 

Not 32 mm, 0.032 inches.

 

i use BKR-7E11 order from sparkplugs.com $2 part 1283, one step colder

 

i would go with either the ngk's previously mentioned (the 7 series) or the Zex plugs, which are 2 heat ranges colder.
(i personally have the zex plugs)

peace