Four days ago I bought a Honda cbr125 , today I shifted down to second to make a turn at the lights, when it pop out of gear and revved as though it was in neutral, I pushed it into a parking lot tryin out the gears .. But nothing, it just revs like it's in neut. I can roll it like it's in neutral even though the green neutral light is off , when I push down On the shifter it makes one click noise like it clicked into gear but doesn't move and can freely role . I tightened the clutch cable but that didn't work. I have a road test on Tuesday and not much money to fix this. I'm mechanically inclined if someone can tell me what to do. The only thing diff about today was I added 4 stroke castor oil to the bike . 10w40 and the previous oil was honda 10w40sj . I only added about one oz to the bike and it read too much oil.