Without going into specifics, as it got me into trouble years ago [when someone else did it!], the MJ numbers written on the needle covers of your carbs look pretty big.

We've found over the years, stock NSRs tend to run rather rich (safe!), and removing your airbox lid entirely would seem to indicate this is so with yours. Bear in mind that the nature of the [dumb] "power jets" (PWJ) too, is that the harder/faster you rev the motor, the more fuel they draw. The idea with them was to use a smaller main jet, benefitting the mid-range/throttle response, and as the motor craves more fuel at higher RPM, it's progressively drawn through the PWJ. HRC blanks off the PWJ, and relies solely on the MJ and needle, hence the much higher MJ numbers in their base settings, which should give you a good indication of just how rich [safe!] stock settings can be!

However, we have found that with modern fuels [with some ethanol content], the slow jets often need increasing one size. Lean and rich can often have a similar "boggy" feel, but we've never gone leaner on the slow jets.
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Andy.
NSR-WORLD.COM

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