LPG spark plug gap & heat range

Apparently thats a crock,yeh use which ever is the cheapest as long as its not champion chit plugs,change them at 20 to 30k and always make sure the leads and cap/button are in good nick as with LPG that is the most important bits and fannys your uncle! or is it bobs your aunt?? cheers Paul

I recently had my 80 series converted to dual fuel with the Appolo Electronic Injected gas system. Best thing i have done!
As for spark plugs, the largest dealer in NSW installed my system and said factory std spec plugs are fine, and one heat range colder are perfect. I fitted one heat range colder NGKs and gapped them as per normal specs of 0.8mm. I replaced all leads, dizzy cap and rotor button too as they had 265,000kms on them and needed it. He then tuned it with his laptop as i drove and it now feels like it has more power than when on petrol, so the plugs must be at least doing ok!
As mentioned stay clear of Champion. I always just go with NGK and have never had a drama.
If you are being quoted $11 more than Nippon Denso then give Supercheap a try or even repco. I have never thought NGK were that more expensive really... Dont worry about fancy ones, when i gapped mine they were the split electrode (called splitfire by some brands) and they were cheap.

Just got mine back from getting the LPG fitted. As mentioned in the first reply load of sh#t as to running hotter or colder plugs. I was told to run the plug that is recomended. I had genuine ones fitted last week when I had the valve clearances checked. Also had the seals replaced that sit down in the rocker covers for the plugs x 6. He told me that the main reason for backfire is, bad plugs, leads, and in your case cap,button. I will replace my leads next week. Although no issues they have done 174k and are the original ones since new so am getting genuine again. Not sure if you have seen it in the paper or not but they have been saying not to use Shell Gas at the moment as it is dirty and will stuff the thingy bobby (what ever you call it) convertor/regulator?? LOL the round thing under the bonnet. Regards Steve M