Ive finally got the time to work on my mc 16 again and got her running quite well, I'm not quite sure on which plugs to use because I have a standard mc16 engine and heads but with mc18 barrels.
Currently using 16 plugs(br9es) should I be using mc18 plugs?
I dont really know much about spark plugs and there numbers,I just dont want to cause any damage , if damage can be done by not having the correct plug?

cheers for any ideas.

The BR9ECM plug is fitted more than anything because of its shorter profile.

If you are still running the MC16 electrical system I woudl contine to use the stock MC16 plug as long as you dont have any clearance problems with the MC18 barrels and heads.
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If I have to take the carbs off once more...

Thanks rc45, yeah no clearance problems and everythings mc16 apart from the barrels, I think I will carry on using the same ones then.