Jaka,
Thanks for the infomation! The bearings on the engine were not gummed up. It turned very freely when I brought it out of storage. I use a synthetic lubricant to store my engines. I have a shelf full of old engines. The tank and lines were the first thing I replaced. I am going to look into this uniflow thing. Also I will try some Nitro-free fuel.
Thanks!
Bob
ORIGINAL: jaka
Hi!
It a fact that if an engine has been running on Castor oil fuel and sat for several years the ball bearings is so gummed up with oxidized (congeled ?) Castor oil that the crank can hardly be moved due to hardened oil.That's one of the reasons why racers change their ball bearings in their engines.
Using the the Uni-flow tank set-up is recommended for best engine performence(next to the Tettra)! It's just one more clunk in the tank! Nothing could be more easy to fix.
Of course there could be a hole in the tank, in the fuel line or a dirt particle in the high speed needle. Check this first!