[NSRCA-discussion] 140, 160, 170DZ muffler question

[John Ferrell]

My experience has been mostly YS140FZ and YS120's.
None will get along with a soft mount and any kind of muffler.
The results with a hard mount are better but still a pain. Breaking the 
muffler is not the worst part of it, you can lose it or worse yet 
destroy the threads in the head. The short tube that came with the YS120 
worked pretty well though.

Using a YS 4 stroke without some kind of locking nut on the prop is 
unreliable and dangerous.
I am kind of relieved that no one was interested in my offer to sell my 
YS140 FZ's. If the buyer has not had the benefit of pattern experience 
he is unlikely to have the skills and motivation to deal with these 
competition engines.
An engine mod to reduce vibration might be workable but I lack the 
skills & ambition to pursue that. From discussions with the engine guys 
involved in other engine competitions a solution will likely involve  
crankshaft mods.

Perhaps someone has some suggestions to domesticate the YS before 
retiring them to the Sport Fliers?

On 3/25/2012 3:45 PM, Michael Cohen wrote:
> I have a disaster in the making when trying to keep my 140DZ sold to a 
> non YS and non pattern user.  I guess I took for granted that we 
> simply discarded the "stock" prop nut set and used Tru-Turns system in 
> its place.  My offer to make it right with the buyer is failing though 
> because the engine did not show up at his door step with a muffler.  
> Aside from the fact that it was not pictured in my add anyway, did the 
> DZ's even come with a stock muffler from YS?  I know the 120FZ did, 
> but not the DZs.
>
> Mike Cohen
>
>
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-- 
John Ferrell W8CCW
"During times of universal deceit,
   Telling the TRUTH becomes a revolutionary act"
      George Orwell

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