It would be good to know if your carburetor is completely stock, or if it has been modified in any way. Are all the jets original? Is the brass plug still in place over the idle mixture screw? Has the needle in the slide been repositioned?
If the carburetor is completely stock, and no re-jetting has been accomplished, you will be pleasantly surprised at how much better the engine runs after doing the mods found on this forum. Readjusting the idle mixture and raising the slide needle a bit work wonders. It’s like a completely different motorcycle, and it's free.
However, if you are anything like me, once you live with the re-jetted carburetor you will find yourself wanting some more steam. The VM flows more air, and more air means you can add more fuel. More air + more fuel = more power.
Why don’t you order the VM from Lancer? It’s a complete kit and hassle free. The 36mm will flow about 8% better than the stock carb. While you are waiting for the kit to arrive, you can go through the stock carburetor and learn a whole bunch. It will be informative and fun. Take lots of notes and pictures.
Live with the re-jetted stock carb for a while. Compliment your souped-up carb with a bit more airflow by modifying your airbox. Then, when you are confident that you have the carburetor & airbox optimized, install the VM. That way, you will have first-hand knowledge on the merits of both mixers.
Do a nice report that covers all the ins & outs of the project and provides your perspective. It won’t cost anything to tune-up the stock carb and modify the airbox. It will be very gratifying to see how much you improve the performance. Installing the VM will give you a nice kick. You won’t be disappointed. When you are all done, your post will be most appreciated. You will feel like a million bucks.
Rutly, I’m both flattered and embarrassed. This forum is loaded with expert members (including yourself) who all contribute top-notch advice. I am far from the sharpest knife in the drawer.