In the UK...
BR8EG = 6 GBP
BR8ES = 3 GBP
G version is specified by GasGas but I've heard many people using the cheaper S version without any problems. I very much doubt anyone would see a difference in performance.
The S version is a standard spark plug, the G is a competition/racing spark plug which would be expected to be replaced more often.
Important points to note...
G version = Sparks at lower voltage, less prone to fouling, shorter service life, more expensive.
S version = Longer service life, can foul easier, cheaper.
If your bike is properly jetted and you're using a good quality 2 stroke oil I'm sure the S version will be fine, although as I said before I always carry a spark plug anyway!
Last edited by Davehuge; 05-13-2019 at 03:45 AM.
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