Hi Zomby, Sorry I spelled your name wrong in an earlier post. If you want more low end torque just open the restrictor to 18MM. I think the 22 MM carburetor has a venturi 0f 17.9 MM. Advancing the ignition timing to 23 degrees BTDC won't help enough to notice. However it won't hurt to advance the timing if you just want to make changes to your motor for something to do. I can verify the change will end up at 23 degrees BTDC, by measuring the flywheel, divide by 360 to find the amount of advance by moving the trigger. If you advance more than 7/16" on many motors the fire will drop because the magnets are not aligned correctly for maximum transfer. On some motors advancing past 23 degrees will almost stop the motor [depending on which pick-up is used]. If you want to advance the timing without problems, simply remove the current trigger plate from the flywheel, lay the plate on the flywheel counter-clockwise until the plate covers 1/2 of the original hole, mark flywheel for new hole. Drill and tap to 5MM X.80, re-install the plate using the new hole and your motor will fire at 23 degrees BTDC. I have several motors [modified] that I aligned the magnets on the flywheel for maximum transfer , made a special adjustable plate to hold the ignition pick-up, and located the trigger plate to match the system and have been able to run as high as 40 degrees BTDC. So far 25 to 27 degrees BTDC works best for top end. Just to make your life a lot easier, if you deceide to move the trigger plate, it helps if you also move the plate slightly when removing the screw holding it to the flywheel. If you don't you may find it difficult to avoid damage to the screw during removal, in fact I have drilled out several before learning this "trick". I think almost all NE motors have the camshaft advance one tooth. Hope this information is helpful.
Have fun,
Quenton