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I have a tecnical question re my 130hp Yamaha ? Every now and then when I trim the motor down I get a load shreeking sound (almost like chalk across a blackboard) . The motor is only 1.5 months old and performs perfectly . What do you think could be causing this ? I first thought it could be...

I dont want to spark a debate here , but having just recently aquired a brand new 130 betol Yamaha . I was wanting to ask the experts what 2-stroke oil I should be using ?