OS140 RX - Problem

[Mortons]

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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