I spoke to Steve Patrickson at SP125.com and he didn't know of any det counter available specifically for the NSR... I know this is where Dave Ett saw them at very good prices, but they were for RS's or TZ's.

He explained that the counter has to be specifically calibrated for the expansion of the cylinder head, which is a different stiffness from model to model, as the counter detects excessive expansion of the head during pre-ignition.

If you know of one for the NSR paul I'd like the info!
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NSR300R - Why did i ever have a 250...