New Sportsman Looking for Hatori Exhaust

[John Ferrell]

FWIW:
First- I am a fan of the YS140 engine I seldom use anything else.
Second- There are very few people that get away with a muffler on them for 
long. The mounting on threads along with the engine vibration make it very 
hard to keep things together. The worst part is not immediately obvious--  
every time you loosen up a muffler, you wear a little more of the threads in 
the head. Soon you have no more threads to mount an exhaust system. The last 
I checked the head was only available as an assembly-- at about $135!

The simple solution really is a pipe & header. Headers are available for 
anywhere from $35-$65, a 40 size pipe will do better than the muffler. 
Header life is indefinite with a hard mount.

A soft mount is not essential on a wooden airplane. A soft mount will extend 
servo life and reduce battery consumption. They are also tough on headers.

If you have already damaged the exhaust threads on the engine you can send 
it off to Clarence Lee (he writes about engines for RC Magazine) and get a 
bushing installed with new threads for about $20. It will NOT be quite the 
same angle & distance for the header as it started out. I am not aware of 
anyone successfully installing a helicoil insert in a YS exhaust port!

My favorite solution is a Hatori Header and a Steve Steele header. 
Unfortunately, I have lost contact with Steve.

John Ferrell
http://DixieNC.US

----- Original Message ----- 
From: "Denny" <dennyo at comcast.net>
To: <discussion at nsrca.org>
Sent: Monday, June 27, 2005 9:42 PM
Subject: New Sportsman Looking for Hatori Exhaust


>I am looking for an exhaust system to add to my YS140FZ (mounted inverted). 
>I recently lost the stock muffler that came with the motor. Perhaps a 
>Hatori pipe #669 and a #791 cooling header or something similar.
>
> The YS140 FZ powers my Four Star 120 as I enter this new hobby in the 
> sportsman class. Any infomation that might lead me to a used exhaust 
> system would be greatly appreciated.
>
> Denny
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