Ugh
The proper oil for a Honda CRF50 is any high quality 10W30 engine oil. A small engine sometimes right very hot.
If you are referring to the viscosity of the oil, 10w40 is the suggested viscosity for the Honda CRF50. Also try to switch to Amsoil and see the difference.
10w40
Oil gets thinner when its hot. Use a slightly higher viscosity.
The recommended engine oil for the 13 horsepower Honda engine is Honda Genuine oil with the Starburst designation. The weight of oil varies with your location and the ambient temperatures but is generally 10w50 in warmer climates.
10w40
10w40 will do.
SAE 5W-30 is what my cap says. I have the same SUV
20w50
SAE 10w30.
20w50
Honda PE01E engine code - what model Honda motorcycle is this engine from?