Davebplastering wrote:
I have always ran ngk Iradium plugs on my bike . Mainly because they are more reliable than standard. When my nitrous was fitted they put same plugs but one grade up . From a. 9 to a 10. The plugs failed after 10 mins of riding. Not - misfiring but a complete would not rev high fail on all plugs. Put another 4 new plugs in also the higher 10s and it wouldn't hardly run at all. So I put my old 9s back and it ran a dream. My bike doesn't like runnin with the higher grade plug. .
Now I just read that normal ngk copper core standards are supposed to be safer for nitrous than iradiums. So I'm going to change to standard plugs. Dilemma now is how safe are they at standard heat rating as my bike don't like any other.
I'm running 40 hp nitrous . High comp forged pistons. Mappable ignition. Dyna coils. Ect ect. Any advice. Thanks in advance
Hi
You should never use iridiums on Nitrous !!!
The main problem of the iridium plugs is the little "volume" of metal. This cant take the additional heat and may weld.
Also you shouldnt use any "two electrode plugs" as the aditional volume of metal would hold to much heat and could cause preignition.
As you have a 97 it must be a carburated SRAD. When the 10s fail i suppose its running way to rich or you let it run to long with the choke.
Then the plugs cant "burn free" and suffer from soiling with soot.
We have the same bike as 96 SRAD and sometimes its hard to fire it up.
We use the choke just to fire up and then keep it with the throttle alive till 70° watertemp. This way no problems with the plugs.
What do you do with the bike and when do you use nitrous ?
Always or only at the track ? If you use the NOS only at the track try the CR 9s and check after two runs how they look.
NGK recomends one step cooler for each 75hp of nitrous
so your 9s are also ok at only 40shot but you have to keep an eye on them , and they wont last as long as the 10s.
If you realize burnt electrodes its time to change.
Its all the carbs
making this problems. On the bandit with only one wrong start procedure the plugs suffer at once
On my Busa i changed from 9 iridiums to NGK ER10 (normal plugs) and didnt realise any difference at all. Was with the bike on the track blowing many bottles ,
and in September in Italy at the Hayabusameeting. I checked them and had just to adjust the gap 1/10mm .
Greets
Bernie