iridium plugs

[steptoe]

sorry Jim,  , but don't use em 

[Jim]

If only I had read this 2 weeks ago.....   Would have saved a lot of dollars

[petejw1966]

anytime under throttle when the rpms
hit 4 -4500, sounded like a hammer whacking
something hard, it couldnt have done the engine
any good.

[steptoe]

what sort of racket did it make WOT,, maybe held under high power they might go bang

[petejw1966]

 the cost that i spent $16 a plug was the main
reason i kept using them, thing was i tried running
a hotter ngk bp5es and the engine had the same knock
which thru me for a bit, then i tried the stock plugs bp6es and the
bike ran heaps better and the knocking went away

so im figuring the iridiums are a hotter plug than the standard
ngk6's.  and ill never buy them again.

the noise, i wouldnt call it detonation, pinging is more like a bucket
of bolts rattling in a steel bucket, this is a much deeper
valve knock,  like a hammer whacking a steel bar.

 

[steptoe]

that will be right,,,

 was using them myself for a while, till my man I get my advise from, told me to throw em away
                                                             
                                      and  !!!!!!!! NEVER !!!!!!!! use em again 

 { knowing how much time and effort I have spent building it }, he didn't say why,, the way he said it was enough, I didn't bother asking, and haven't used them since,

maybe DETONATION is  the end result

if any of you are using them, cut your dollar loss and turf em

[petejw1966]

ive been using ngk iridium plugs for a little while
and noticed i had what sounds like a bad valve knock
under acceleration from 4-4500rpm,

after replacing the plugs back to standard ngk
plugs i know longer have a valve  knock and smoother
acceleration.

maybe if your using iridiums and have a knock in the engine,
 it could be worth while switching back to standard ngk plugs