CHM

My Feedback: (28)

Okay 4-stroke owners-

I'm about to buy a 4-stroke and I have a couple questions.

1) Does the YS .63 pressurize the tank? If so, any chance of a rupture?

2) Is fuel draw a problem on the Saito .72 during extended hovering. What I mean is, do you set the needle very rich and then it's okay for hovering?

3) Do any of you use the micro-oscillating pumps to help with #2 question (If that's an issue)?

I know the YS is a few bucks more, but is worth it. However, I wanted to work a deal at my LHS and he doesn't stock YS.

Thanks,
Chuck

NM2K

My Feedback: (14)

If you are planning on doing wild aerobatic maneuvers, go straight to the YS.63 and don't look back.

While other engines can be used, they will be at a disadvantage when compared to the YS.63.

CHM

My Feedback: (28)

Saito owners, do you like your .72's?

YS owners, you've almost got me convinced. But, how are you handling the pressurized tank, or isn't it as big an issue as I've been told?

Finally, this motor will be going on a Pizazz for break-in, then onto a Laser 3D or a Seduction FS. I'm thinking about APC 13x4W or 14x4W props. Sound about right? And can I get away with Omega 15% 2-stroke?

Thanks for all your help and advice. I've been running two strokes since 1968, so I think (with your help) I can survive this learning curve.

Chuck

Dansy

My Feedback: (53)

I have good success with normal dubro tank but I wrap them with tape...the one with the fiber not sure about the name...they last a long time.

Daniel D.

CHM

My Feedback: (28)

Thanks for the input.

Keep it coming. This is a big investment.

can773

My Feedback: (1)

Dubro tanks all the way, no taping required. The smaller engines dont put out enough to give you a good chance of a burst. The 140's will burst some tanks but they are the only ones of the entire YS line that I have had blow a tank.

You can run 15% but they scream on higher nitro, that said you wont have a power problem with 15% on any of those planes you mentioned.

13x4W might be a little light, I ran it on my 53, 25% nitro and get 11,000 (3800' ASL) which is about as fast as you want to run them. The 14x4W would likely be a better choice, I have also been told the 14x4 Zinger is a nice prop.

The 53 out turns the 72, and the 63 out turns the 53 by about 800 rpm, if you want power there is only one choice

snsmith

My Feedback: (5)

I wrap all my tanks that might see YS engines...it adds virtually no weight and supports the tank under pressure. Use the fiberglass-reinforced strapping tape from the office supply store.

I've used Hayes and Dubro tanks with no problems, but avoid Great Planes tanks since they had the splitting issue (under muffler pressure) awhile back. I'm sure it's been fixed, but I'm not willing to try a YS engine on one...

Wonder

My Feedback: (7)

In post no.3 Ladyflyer said:
What do you mean by this?

I just ordered my first YS engine, a YS-91 for on a Sig Hog Bipe, I too can use all the tips I can get on this engine( fule, prop, plug and so on).

Thanks, Tim

CHM

My Feedback: (28)

Thanks everyone!

I guess the YS 63 will be my choice. And I'll get some 14x4s for flying 3D.

Is an APC 12.5x6 okay for break-in?

Chuck

djlyon

I've used both the YS63 and Saito 72 in a pizazz. You'll be happy with either. Use 30% nitro on the Saito. Go with the 13/6 APC unless you put much bigger wheels on the plane. I normally strap the tanks when I use a YS. I didn't on the Pizazz and had no problem with the tank that came with the plane. You don't have to set the Saito extra rich for hovering. As far as flying and hovering I can't tell the difference between the 2 engines on the plane even though the YS turns the 13/6 at higher RPM. I tried several different props in the 12/x to 13/x range. wood and composite. The 13/6 APC was best by quite a bit when it came to vertical excelleration. For break in I ran both engines on 12/6 APC for 2 tanks. Both engines were ready to go after one tank

CHM

My Feedback: (28)

Wonder,

I think it means that you can't treat a 4-stroke exactly like a 2-stroke. I think you'll want a tach for tuning. And keep in mind that they develop power at lower RPM than a 2-stroke.

Chuck

djlyon

One thing I forgot to mention. The YS63 is much prettier.

JohnW

My Feedback: (6)

In the realm of 4S glows, YS engines are more complex to setup than others, but they are not "hard" and it is well worth the effort IMO. I'm not going to second guess what LadyFlyer meant by "learning curve" but I have personally seen YS newcomers stumble a bit. Here's my 2 cents worth.

1. Use a good plug only, OS-F or YS

2. Use the right fuel. 15% nitro is marginal, depending upon your altitude, temp, etc. Use 10% and you'll have nothing but problems setting mixture, at least that has been the case where I live at about 1200 feet, expecially if it is cold. 20% or 30% is best. I have personally used 15% CoolPower and YS20/20 with success, but now I only run WildCat 30% heli in my YS engines. YS engines LOVE nitro. YS recommeds 20% synthetic oil and no castor. I have used 18% synthetic with no castor without adverse wear or cooling problems.

3. Realize that you have three mixture settings. Low, High and Regulator. I have always had to adjust my regulator on new engines to get the proper mixture in the mid range. Messing with the reg will effect the high and low settings. It may take a few flights to get all three settings dialed in. In addition, if the butterfly in the carb closes too much or not enough you'll run in circles trying to get a reliable idle. It should be just cracked open at idle.

Wonder

My Feedback: (7)

Thanks for all the tips!

Tim