That alloy screw's not a blanking screw; it's a cover screw. The actual powerjets should be HRC blanks [#0] or soldered/epoxied up to close the system off.

I know you will have seen the tables already, but for anyone searching/reading this later, here are the stock settings for each model.

https://nsr-world.com/nsr250r-workshop/nsr250r-stock-jetting/

HRC base settings can be found here:

https://nsr-world.com/nsr250r-tuning/nsr250r-carb-tuning/#hrc-base-settings
_________________
Andy.
NSR-WORLD.COM

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