OS140 RX - Problem

[Lance Van Nostrand]

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" <jrmmorton at earthlink.net>
To: <discussion at nsrca.org>
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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