Rcpilet........
I bet it was worth it! Out of 5 O.S. engines ......I could do it to 4 out of 5. Two 91FX's and had to spend 30 bucks on each just to get them to run right. I would NEVER buy another O.S. Especailly when there engines like Irvine, YS, Saito,Thunder Tiger, etc. I think it's odd that no one can post the inheriant problem of the 91 to the O.S. rep on this forum. I hear, somehow it gets deleted? Yet there are PAGES of complaits toward the remote needle valve problem of the 91; with NO help or a fix from O.S.
Now, there's a new O.S. 46 with 4 head bolts, what is this? Is this to save money? I am weary. Too bad.... they were so good.