Ive been running the NN21R and its bloody good. Its fast beyond what it ought to be for its price! I have had no issue with tuning, the factory settings are good for running in and then lean out very little and it screams.
At Stoke on Sunday, I was doing a 3 minute warm up straight into 5 minute race without stopping, finishing in 5min 37 seconds. So thats almost 9 minutes, and I have 1/3rd of a tank left.... so thats easy 12 minutes+. I run it on Byron 30%.
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