for ten points...

[chojindan]

... how big should the spark plug gap be?

I've tried searching but I can't find anything!

[Phil-VTwin]

On what type of plug? Platinum or Iridium?

Hint - the platinium plug gap feeler guage is on the outside of your tool roll

(It should be between 0.8 and 0.9mm)

Edit - to early in the morning for me and have been working on old cars recently - dont use a feeler guage with either of these plugs, use a 1mm wire guage and if it passes between them the gap is too big!

[chojindan]

they're iridium plugs, my tool kit is very much incomplete so I was going to use a feeler guage...

so why not use a feeler guage?

[vtrbarmy]

25 thou / 0.7mm depending on what feeler gauge you have (the feeler gap gauge on the tool roll is 0.7 - oh but you don't have that)

[benny hedges]

just another useless piece of information, from my 2 stroke days, fag packet cardboard is 12 thou.
double it up and youve got your 24 - and it won't scratch the tips ;)

[Phil-VTwin]

they're iridium plugs, my tool kit is very much incomplete so I was going to use a feeler guage...

so why not use a feeler guage?

A flat feeler guage will damage the the coating on the tip of the electrode. If the wire guage passes between them replace the plug, Iridium & platinium plugs are not adjustable and should not be cleaned like copper core plugs.

HTH

[TUG]

Maybe its just me being spoilt, but i was told that adjustin gaps is a bit pointless as it is worn unevenly, this is coming from a man that has been in the trade for more years than i could count lol. I replace them if they round off, i dont check the gaps unless a customer complains of poor running and its normally all down to poor balance and plugs with added blocked air filter.

[simo]

Firestorm plug gap, 32thou end of story