Quote:
Originally Posted by MauR
......... MotoFool:
1. The first link states CR8HSA, is this number for pregen 250?? or what is the difference with CR8E??
2. Do you think that with this carburettors I can remove the snorkel safely and do no shimming??.......
Thanks again!!!
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1) Yes, that recommendation is for pre-gen Ninjas.
The difference is in the thread length: letter H stands for 12.7 mm, while E stands for 19 mm.
S stands for copper core center electrode (not pure copper, but special nickel-steel alloy).
IX stands for iridium core center electrode (also an alloy).
The number 8 is the heat range, which in your particular case of current rich mix, and if modifications to the snorkel are not sufficient, could be safely elevated to 7 (hotter) to help with electrodes fouling.
http://www.ngk.com.au/spark-plugs/pr...mbering-system
2) Yes, you may need more air in the mix.
If so, the properly operating carburetor may be the one with the black plug, while the plug with proper color may be fed by a carb with certain restriction in the jets 9due to fuel deposits or dirt) that make the mix leaner (which happens to be correct for your altitude).
You are welcome
