[250 Tom]

I use amsoil in all my bikes. After break-in I switch over to synthetic. There are many good oils out there but whats more important is keeping it changed on a regular basis. The little motor will be putting out a lot of R.P.M.s. Take care of it and it will take care of you

 

[250 Tom]

To bad you didnt just put in the right oil in the first place. Not sure if it would hurt anything or not but it was me I would just change it again for peace of mind as they say. It only holds a guart and a half so not really that big of deal