Hi Skynrd Man,

Many ARFs have metric puch rods that are a smaller diameter than a 2/56 clevis. The Clevis will seem to screw on but under load the rod can move inside the incorrectly fitting thread of the clevis as they are different sizes.

It is quite ok to use a metal clevis on the throttle if the arm on the carby is non metallic. The metal to metal of clevis and metal throttle arm is what causes the problem of RF interference.

When you say you have lost the servo did it go missing in the prang or is it nolonger working? Most often the gears are stripped and you can get replacement gear sets cheaply, much cheaper than a replacement servo anyway.

With regards to the motor what ever you do don't turn it over until you have stripped and cleaned it. Usually removing the carby and the back plate and checking there is not grit after washing in fuel or solvent and brushing with a soft small brush is sufficient. In extreme cases it may be necessary to fully strip down the motor. Don't just blow with high pressure air as this simply forces grit deeper into the innards of the motor.

Good Luck,

Colin