Originally Posted by
loopdeeloop
Look at that engine closely -- you will notice it is the front needle valve version. Nothing wrong with that but your fingers do get close to the prop for tuning. The rear needle valve is the more desireable.
if you read the description in the ad you will see it has a remote needle assembly. Ive own a couple os 61FXs and own two Magnum 61 XLs and the magnums are just as reliable as the os plus slightly more powerful. Actually if you compare an OS55AX versus OS 61FX the 55 will swing the same props faster.