OS140 RX - Problem

[Lance Van Nostrand]

Sorry to hear about that. I am not aware of a way to repair an overpressed pin.
--Lance
  ----- Original Message ----- 
  From: vicenterc at comcast.net 
  To: discussion at nsrca.org ; discussion at nsrca.org 
  Cc: Lance Van Nostrand 
  Sent: Monday, August 29, 2005 10:00 AM
  Subject: Re: OS140 RX - Problem


  Lance,

  Now you said that, I think I have that problem with an OS 160 that I replaced the bearings not long ago.  The engine never wanted to run like the others and as before after replacing the bearing.  I bet that I didn't align the ring with the pin.  

  Thanks for the "eye opener"

  Vicente Bortone

    -------------- Original message -------------- 

    > You might also make sure the ring is properly located on the piston. Some 
    > pins in the piston are shorter than others and actually allow assembly with 
    > th ering rotated 
    > --Lance 
    > 
    > ----- Original Message ----- 
    > From: "Mortons" 
    > To: 
    > Sent: Sunday, August 28, 2005 5:41 PM 
    > Subject: Re: OS140 RX - Problem 
    > 
    > 
    > > Amran, 
    > > 
    > > Something similar happened to mine (at a contest no less) and some of the 
    > > nickel plating on the cylinder liner had flaked off at the exhaust port. I 
    > > replaced the piston and cylinder with a Performance Specialties AAC and 
    > > have had no problems since (and a bit more power too). Please look at your 
    > > piston and sleeve. 
    > > 
    > > Ray 
    > > 
    > > Amram Private wrote: 
    > > 
    > >>Hello to all. 
    > >>The story is about OS140RX with OS header, ES CF tune pipe, fuel 20% 
    > >>Nitro 16% oil. 
    > >>Engine gained 28 hours with no problems whatsoever. Time has come to 
    > >>replace the bearings as I stared to notice some freedom. I was able to 
    > >>get the FAI bearings set on Thursday so before changing the bearings I 
    > >>decided to go for few 
    > >>more flight on Friday and then to change. On Friday at field, I was 
    > >>able to start the motor normally. While on Idle when I was ready to lift 
    > >>the model and take it 
    > >>to the runway, the motor stopped. This was strange as it used to hold 
    > >>very steady idle. Since then I could not start the motor. The motor 
    > >>seems to be with low compression. Today I opened the motor and changed 
    > >>the bearings. All motor internal parts seems to OK and clean with no 
    > >>special dirt or signs. Still the motor does not start and still the 
    > >>feeling is of low compression. Is looks like the motor "Wants" to start 
    > >>but not enough power. Fuel supply is OK as when I prime, fuel comes out 
    > >>on the carb. (Motor is upside down). Plug is completely new (Type F), 
    > >>Booster is OK ProDiver Mark III - Radio South (Same problem when I tried 
    > >>a normal booster). The motor build-in fuel pump never been touched. 
    > >> 
    > >>Any Ideas? 
    > >> 
    > >>Thanks in advance to all helpers 
    > >>Amram Leshed 
    > >> 
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