I injured my back recently retrieving a power torque engine from a my own wheelie bin.

As a result I could only pull the starter cord on my regular Victa V160 from less than half way and very gently. To my great surprise the engine started.

I then have to jungle the throttle to various positions until the revs build up other wise it stops . There seems to be 'dead' spots in the throttle positions.Once going the engine runs well, even so it can still stop or greatly lose power if I change to a wrong throttle position.
John