[NSRCA-discussion] OS140rx problems - help needed.

[colin chariandy]

Hello 
   
  I started having problems with my 200-300flight old rx last season after I lost my muffler ( Bolly 460) in flight. I decided to upgrade from a muffler to an Aeroslave pipe. The motor ran poorly on the pipe and I blamed the set-up. Poor midrange required that I back out the pump 3/4 and set the top end a bit lean for reliable operation in the air. The setting would change from one flight to the next. On the ground the engine would load up and eventually quit 1/2 the time. I have now gone back to a muffler ( Bolly 590) and the engines runs exactly the same as on the pipe...very poor mid-range, erratic operation.
   
  Previous bearing replacement was the stock item put in 50 flights before the problems started.
   
  I'm going to guess I need to replace the main bearing. What should I buy and where? What else should I check/replace ? When should ring/sleeve be replaced? Does anything else go wrong with these engines...pump problems ?
   
  All inputs are welcome.
  Colin.
   
   

		
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