View Full Version : 500 hp plugs
donzi2287
03-12-2009, 02:03 PM
What plugs go in a 502/500hp? I have used the Delco MR 43 T and the marina recommended an NGK. It has longer threads than the Delco. Will the longer threads work and maybe this is why I have been backfiring.:sifone:
I used NGK BR6FS's in mine without any problems.
donzi2287
03-12-2009, 02:38 PM
Are those short threads or long?
I don't recall what the thread length was.
All I remember is that it ( BR6FS) was one of the recommended
plugs used for HP500's in my mercury hi perf. manual.
I've used them in a couple different HP500's without issue
Geronimo36
03-12-2009, 05:06 PM
BR6FS is the std. hp500 plug. The MR43T should be the equivalent plug.
donzi2287
03-12-2009, 09:45 PM
Thanks again!!!!!
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