This is a guide written by me to adjust Honda NSR 150 SP Oil Pump to increase or to decrease your 2T Oil intake. If you are having too much white smoke, you might want to decrease your 2T oil intake and vice-versa.
Warning :: It is highly recommended that you have some basic mechanical skills to perform this job. You must understand that a wrong adjustment of the oil pump might caused piston seizure or even reducing the lifespan of the engine. Henceforth, I hold no responsibility for any damages caused by following this guide to adjust your NSR 150 oil pump.
First of all, remove your right cowling to access the bike Oil Pump system. Then,

Next, understand that the red highlights in the picture below is the Oil Control Cable.

With this in mind,

You might noticed that there is a lock nut too below the “documented” lock nut in the picture above. Remember to screw both lock nut tightly once you have finish adjusting the oil control cable. Failure to do so might result the Oil Pump system going haywire!
Do keep in mind that the aligning mark on the oil pump drum MUST aligned with the index mark projection on the oil pump body when you do a full throttle. This is the default setting for the Oil Pump system. However, an extra adjustment of 1mm (0.04 inch) of the oil pump drum aligning mark going pass the index mark projection is acceptable. The 2T intake will be further increased.

In addition, NEVER let the index mark on the oil pump drum aligned before the index mark projection. Failure to do so might result in serious engine damage!
Once you are done with the adjustment, just tighten both the adjusting nut and lock nut to “secure” the oil control cable.
That’s all for my guide. One last tip to share, a few round turning of the top lock nut on the oil control cable is very sensitive. A few round can affects the 2T ratio to petrol even though the Oil Control Cable doesn’t seem to be going downward. Adjust accordingly to your own needs.
Good luck and have fun!~
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