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Colin:<br>
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.<br>
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.<br>
<br>
Chris<br>
<br>
colin chariandy wrote:
<blockquote
cite="mid20060429041234.29381.qmail@web31301.mail.mud.yahoo.com"
type="cite">
<div>Hello </div>
<div> </div>
<div>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.</div>
<div> </div>
<div>Previous bearing replacement was the stock item put in 50
flights before the problems started.</div>
<div> </div>
<div>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 ?</div>
<div> </div>
<div>All inputs are welcome.</div>
<div>Colin.</div>
<div> </div>
<div> </div>
<p> </p>
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