Hi
Hoping some one can help me.
I recently had to take the cowl off my YS 63 powered Stream for repairs. I now have the cowl back on however having carefully noted the number of turns that the needle valve was out from fully in I have promptly lost the bit of paper.

This is my first four stroke so I am assuming I set the high speed needle by getting the engine running ( i believe 2 turns out is a good starting point). Then adjusting the engine with either by ear or by using a tach until I get max rpm then backing it off half a turn.

Is this correct or am I barking up the wrong tree?

Mike

Everything sounds good to me except the part about backing it off a half turn, adjust to peak and back off a few clicks. I have not had a YS63 for a few years but I think the theroy is the same. Mine would slack on the power if I richend it up to much and needle setting was sensitive as the difference between a dog and and a monster was only a few clicks. Hope this helps.

Hi, this is what i did for my YS 63, i opened 2 turns from fully closed position, started the engine and leaned it out till highest RPM.
then, i riched it 4-5 clicks, works well, no more troubles , i tink fuel matters, ever since i switched to cool power heli mix, i have no more "sufferings"


cheers