[NSRCA-discussion] OS140rx problems - help needed.

[Chris Moon]

Colin:
    50 -75 flight on a stock OS bearing is about normal.  The symptom 
that I had that the main bearing was going (70 flights) was that the mid 
range would load up and it got progressively worse until I changed the 
bearing.  I have switched to the OS sealed bearing from the 1.40EFI.  
Yes, they put a good bearing in the EFI and a cheap one in the RX.  I 
have 1 motor with almost 400 flights on the EFI bearing and it is still 
in good shape.  You can order them from Tower for like $25.  I just go 
ahead and put a new EFI bearing in a new motor even before I run it now 
so I won't have to mess with it again for a looooong time.
Also, I would never mess with the pump.  If you are having some issue 
with the motor, it is trying to tell you something other than the pump 
needs adjusting.

Chris

colin chariandy wrote:
> 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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