Hello,
Any ideas on why my and engine stalls a few seconds after it turns upside down? Other cars run upside down for more than a few seconds.
Its an OS .28 engine in a truggy running an OS P3 plug using 25% Nitro.
Is it a sign of a too rich setting?

Thanks

Running rich can be a cause, Longer fuel tubing helps, air bubbles in the fuel line is another issue that can cause problems. Also a slighlty longer exhaust tube can help maintain better pressure to the tank.

Dosent it also depend on the fuel tank, I know the Losi 8ight T and Hyper ST are fine upside down, but I also know of some trucks that stall when upside down.

Losi have a think what they call a dunk tank. The fuel line that goes into the bottom of the tanks actually will flop from bottom to top when the truck is flipped over so no matter what you are getting fuel and they will run fine upside down.

you should get about 3 seconds per inch of fuel line at upside down idle. if it stalls out after a few seconds your idle may be too low. at temp, set idle with set screw. go in until tires start to turn then back out a bit. tada.

vnmsgt...its called a Clunk....Not a Dunk.

lmao vnmsgt must have had dunkin donuts on his mind??

LOL! yea it happens. I run 12 inches of fuel line so I have some time to go and pick it back up. its normal. I want a special tank that "dunks"