Truth about YS engines

[sparky]

I have been hearing that if you do not fly the YS engines regulery, the Diaphram will go bad on you.

I work 6 weeks and I am off for 4 weeks. While I am at work, the heli will be at home, all alone, and lonely. I want to get the YS as I tune other peoples engines and love how easy it is to tune and its power output, not to mention how much smoother it sounds. But i also dont want to be changing Diaphrams every time i get hom either.

So, is the rumor true about the diaphram?

[WayneBrown]

I have been hearing that if you do not fly the YS engines regulery, the Diaphram will go bad on you.

I work 6 weeks and I am off for 4 weeks. While I am at work, the heli will be at home, all alone, and lonely. I want to get the YS as I tune other peoples engines and love how easy it is to tune and its power output, not to mention how much smoother it sounds. But i also dont want to be changing Diaphrams every time i get hom either.

So, is the rumor true about the diaphram?
Short answer: :bs

If you leave the engine in the heli, it will be fine for 6 weeks no problem.
Put a fuel clamp between the carb and tank, and clamp it off. drain as much fuel as you can from the line between the clamp and carb.
The only problem I have ever had was when I forgot to clamp the line, and the alcohol portion of the fuel evaporated and left the oil behind.
The engine was hard to start until the fresh stuff got to the carb, then it was fine.

[sparky]

SWEET!!!!!!!!!
That was was what I was hoping for!

[archiebald]

I have been hearing that if you do not fly the YS engines regulery, the Diaphram will go bad on you.

I work 6 weeks and I am off for 4 weeks. While I am at work, the heli will be at home, all alone, and lonely. I want to get the YS as I tune other peoples engines and love how easy it is to tune and its power output, not to mention how much smoother it sounds. But i also dont want to be changing Diaphrams every time i get hom either.

So, is the rumor true about the diaphram?

Several people run YS at my club....including me. Never heard of one bad diaphragm.

Sounds like old wives tales.

[DavidH]

Probably the people that have YS's and said the diaphragm went bad from the engine sitting for six weeks or more. They didn't tell the whole story. They probably used a petroleum based after run oil in the engine when they stored it. This in turn detoriates the diaphragm. If you use after run oil, it needs to be sythenic and not petroleum based. There is a few after run oils on the market that are suitable for YS engines.

David

[Tim Smith]

:clappp(old wives have Tails.?) Can you put a gyro on them too? My friends old wife just hangs out in the kitchen doing tail spins and piroetts all day. Maybe I better tell him to put a Futaba on Dat ***** !:smokin:

[Alfred]

I might chime in.

Yes, After run oil "can" stuff the diaphram. I know the Marvel does..happened to me.
I have YS sitting here for months without running and used to have problems, getting the engines going again.
The reason appeared to be that any fuel in the engine will dissipate, leaving the oil behind, which seem to leave the diaphram sticking.
This can be very nusty, as it might just stop working in the middle of the flight. And not just on the 1st tank...aks me how I know.

The complete cure was to run the engines dry, clamp the fuel line to the carby after releasing the pressure to the tank, then reconnect the glowdriver and keep firing the engine (in idle) until there is no evidence of ignition anymore.
Wait for it..not finnished yet....
Now disconnect the glow driver, open throttle to full and keep turning the engine over. Not sure how to explain it, but you can hear when all the fuel/oil is completely out. There is a change of sound when it's all out.

Now for the guys that fly regular, none of this is required.
But for us that might fly a weekend and then park it for weeks/months, it cures the dreaded engine issues.

Sounds complicated? The whole thing just takes about 60 seconds at the end of the flying day.

[Cory101]

My dad has 5 YS's and has never had a diaphram go bad on him. One of them he's had for 12 years and it still looks like it just came out of the package.

[bigcat1]

I have a ys st2 61 that sat for a few years and it runs perfectly in my X-cell 60 graphite.Clamp the line and burn out the last of the fuel in the engine after your last flight for the day and it should be fine for sevral weeks.For long term storage maybe a shot of after run oil my be a good idea.

[scorpion140]

The only problem i have had with a YS is the Check Valve failing, but this was after many hours of use.

Phil.

[Raptorman37]

what after-run oil is suitable for these engines? Synthetic ATF? I'm looking at a YS50ST for the Vibe 50 when i get it.

[HYDROmania]

very easy:shock:
before you leave home for a long wile:(
just put 1cc off automatic transmission fluid (from your car or power steering)
in the engine turn it a few times :clapppready

for starting get out the glow plug:thumbup:
put fuel in the tank:shock:
turn engine with the power starter a few seconds

and off you go:clappp:clappp:clappp

greeting from holland

martin

[WayneBrown]

what after-run oil is suitable for these engines? Synthetic ATF? I'm looking at a YS50ST for the Vibe 50 when i get it.
it HAS to be synthetic, or the diaphragm will get wasted. I just run dry and forget.
Bearings are cheap, its not worth the hassle to me to fool with a gummed up engine cuz I used after run oil.