I have searched the web for spark plug gap on my 2000 Accord EX 4 cyl. , My search resulted in many sources stating .044". But when I looked on the catalyst tag under the hood it says 1mm. ( .025") thats a big difference. What the hell? Any insight?

 

The last 2 digits of the NGK spark plug number indicate the spark plug gap;
ZFR5F-11 1.1 mm gap or .043 inch

 

i have always gapped at .043" on my 95 accord. should be the same or very close for the f23

 

MY BAD!! I just did the inch to metric conversion and 1mm. is actually .039". So the catylist tag under the hood is correct by stating 1mm- 1.1 mm. (.039"-.045") . Thanks guys. BTW changing the plugs made a big difference. I had Bosch platinums in there for the last 60,000 miles and just put the NGK V-powers back in, it starts quieter and has much smoother power!