Try this link to [link=http://media.hobbypeople.net/manual/210970.pdf]magnum 91 manual[/link]

If I'm reading right you have the motor inverted. Assume you have looked at the tank's position relative to the needle valve making sure its not too high or too low?

I have 2 of these motors and they run great. I start them with the needle open 3 full turns and then work from there.

An OS F plug is a must.

Chris