View Full Version : O.S. or Y.S. opinions please
scooby61
04-03-2008, 05:26 PM
i'm looking at going ahead and picking up a 91 motor i think they may become a little scarce once this heli hits stores. but i have heard that the os 91szh with pump has issues. what are the issues and how many instances are they occuring? the ys is very nice and cheaper but i've heard they are difficult to maintain a solid tune on. any recommendations or opinions appreciated.
huskynox
04-03-2008, 05:34 PM
http://www.helifreak.com/showthread.php?t=67144
Airboss
04-03-2008, 06:27 PM
it all comes down to personal choice, I use the OSszh91 in one synergy and the OSszhpump in the other synergy. both have excellent power and reliability and I have never experienced any failued bearings or tuning issues. the pump version does require a bit more tuning than the non pumper. and carbsmart would be a good choice also.
LoveMyTrex
04-03-2008, 08:08 PM
scooby you should get the YS you have been looking at and the carbsmarts we just got in stock :)
Lota Fun R
04-03-2008, 08:57 PM
I haven't had a YS but I have an OS, it works fine.
wacojoe
04-03-2008, 09:22 PM
scooby you should get the YS you have been looking at and the carbsmarts we just got in stock :)
Who has carb smart in stock. I want one.
thx
bmlasater
04-03-2008, 10:46 PM
fwiw...
May want to wait for the TT Redline 90...If it's anything like the .53....WOoHOooo..
John.
newbie
04-04-2008, 06:28 AM
Hi,
have a YS.91ST with Hatori pipe on my AS90,very reliable engine,good power,easy tuning,i like the presurized fuel injection system too :)
have a .50ST on my Trex 600N too :)
scooby61
04-06-2008, 10:26 PM
got the ys we'll see how well it does now for all the other crap i'll need.
LoveMyTrex
04-06-2008, 10:31 PM
500!
R1R 7humbs
04-07-2008, 11:34 PM
I switched from an OS 50 to a YS50st and I'll never go back to an OS. I don't have any .90 experience but I've been told the YS90SR is much closer to the OS90 in power than the ST is.
I also heard hat OS may bring a longer stroke version of their 90 to market...
Helirob
04-13-2008, 07:10 PM
Thunder Tiger is going to release a 106 engine soon. That should make the 700 a monster.
Super D
04-13-2008, 07:30 PM
Are they really gonna relese it? i have seen a few posts saying look and ill find it but i have searched everywere and havent found it?
Helirob
04-13-2008, 07:45 PM
No release date set on the Redline 106 yet, hopefully we will see it in June.
Airboss
04-16-2008, 05:03 PM
if you dont know the gear ratio yet choosing the motor too soon would be a mistake.