OS140 RX - Problem

[vicenterc at comcast.net]

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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> >> 
> > 
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