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TLDI spark plugs

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Hello all,

I have a pair of 2006 Tohatsu TLDI MD90B motors on the same boat, though their serial numbers are quite widely spaced apart- one is 011327XF and the other is 048235XF.

In the Tohatsu parts catalogue,and also in the NKG parts catalogue, the recommended spark plugs are different depending on the serial number. For models before 033166XD the NKG part is PZFR6H, after that they say to use IZFR5J.

Does anyone know why there is a difference? Are the engines actually different, or is this just a change of part to improve some aspect of performance? Would it matter if I use the earlier or later versions on both engines? It's not clear to me what the actual differences are between the plugs; any suggestions on where I can get a clear comparison?

Cheers,

-phil
 
Thanks Paul, I note the earlier plug is one step 'colder' and might be more susceptible to fouling with low running speeds, I'll experiment :)
 
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