I have a air cooled 49cc GY6 Scooter with motor 1P39QMB 64mm valves. I added the 100cc big bore kit, advanced timing cam, unrestricted CDI box, upgraded the exhaust, performance air filter, 2600RPM CTV.
Stock at 49cc manufacturer suggests 15w40 but I feel like I should use 15w50 or 20w50 since I...