Recently changed the oil on my 50cc with the oil that was recommended for my 125 which is 15w40 synthetic but also says my 50cc is 15w40 so I thought it would be fine. First off I did debaffle first and test ride before oil changed and noticed it was slower take off, mid and top end.. but sounded great. Changed the oil after a 5min ride of testing the debaffle and then test drove again.. 20 max uphill which was originally 30 if not more. Flat 33 which is normally 42 and downhill 37 which is normally 49... What the hell happened? It's dangerously slow. Please help.