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Old 04-11-2004, 05:53 PM
Eric.Henderson's Avatar
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Default RE: OS 140 Plumbing Question

The OS 1.40 carb will allow fuel to pass through it unless it is fully closed. This means that fuel will escape when being pumped into the tank. It can also escape if the tank is higher than the carb. The pump lets fuel through in that direction.

I used the "dot-system" and had no problems as long as I fully closed the throttle trim before switching off the RX. Of course if I forgot to do that, then the radio was needed to turned on before I could fill the tank.

I now use a "Break-in-the-line system" on all my pumped 2-c's. It prevents carb drip and fuel loss when filling. Allows easy cut-off at end-of-day - just dissconnect the line.

The engine really only floods when turned over too often. If run inverted much of the flooding comes from unburnt or raw fuel re-entering the cylinder from the header. The exterior line also allows you to pinch the line to lose excess fuel or test needle settings etc.