ORIGINAL: w8ye
Jaka,
While what you say may be true, the original OS 91 FX had a well documented problem with the cast on design of the rear needle valve transfering heat to the fuel and causing lean running.
This caused OS to redesign the rear needle valve with a less conductive design.
EXACTLY, this matter has been up in here several times before and is a well know "defect" on the early 91 FX`s. There`s a reason why OS changed the design after a while
I have personal experience to show for in this case, I bet this is the well known "remote needle syndrome on the 91 FX only" that strikes again