Even the Tower Hobbies remote needle assembly has worked good. Its cheeper. The new OS 91 FX remote needle valve can be purchased and installed? http://www2.towerhobbies.com/cgi-bin...?&I=LXMW56&P=Z but you'll need the bracket # OSMG9152 I did mine and sawed the remains of the origninal bracket of the backplate. I didn't have to buy a new back plate. This needle valve is from the LA series of OS engines.

After having the bubble problem, people have been mounting their needle valves on the firewall. Try to keep the needle as close as you can to the spray bar without it being too close to the prop?

I was around one Saturday that had a K&B needle mounted on the firewall. It ran perfect. The old needle was still on the back of the engine but not hooked up.

Enjoy,

Jim