Personally I use 10w fork oil and reduce the air gap by 5mm. Then again I'm fat.

If the dust seals are ok and you're only looking to replace the seals you can use the HRC fork oil seal (part # 91255-MN8-741). These retail at £2.31 per leg compared to the NSR fork seal set (part # 51490-MN8-305) that retails for £17.55 per leg.
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If I have to take the carbs off once more...