BE-1265 Second Round of Break-In Runs - no real improvement ...
Past weekend ran engine again on 10%Nitro/20%Lube/Methanol - engine would start OK but would not remain running ... longest run was about 1.5 oz.'s of fuel ... many shorter runs between 0.5 -to- 1.0 oz. of fuel. The engine would start up slowly ... then increase RPM to somewhat normal steady operation ... GOOD ... then slight RPM oscillations during the operational run. I'm using a 2 oz. tank.
It appears to me that the engine venturi inlet suffers from too little fuel suction draw. When the tank is full ... there is some positive fuel pressure by gravity to the venturi inlet (i.e. needle valve). When the tank fuel level drops much below the needle valve ... the engine "seams or appears" to struggle for fuel suction to the needle. It seams to experiences a form of fuel starvation ... then the RPM slows and the engine stops .... no fun! Is an engine "tear-down" in order to examine the internal workings of this engine ... hhhhmmmmnnnnn! Or is it beyond help???