As mentioned, "positive neutral finder" feature won't allow shift into 2nd-gear unless rear-wheel is spinning.
Clutch is on right side of bike controlled by left handlebar lever.
Do you mean gearbox shift-lever on left side of engine?
Why did you adjust it? Improper adjustment will prevent clean shifts.
Should have set so shift-rod is exactly 90-degrees to each of little arms at each end.
One arm connects to foot-pedal and other arm connects to gear-box.
