YS 110fz engine problem
 

Hello, i want to ask about a problem with my fz110 non S version. The engines has almost one year and was running in per instructions. I tried all the method found here to set it right, but it always start having mid range problems about 4 mins after running. The full throttle is fine, with some oil smoke, but when I reduce throttle to 1/3 the engine just trie to quit. I have opened the regulator, but it made the same thing, it take more time or it does it in lower rpm. Also when I stop the engine, its spill a lot of fuel from the carburator.
I have done almost everything, but it doesn´t run fine.
I am about to sell this engine, but I wonder is if there something that I could change, like the regulator, to make it run fine.

Thanks,
Alejandro.

RE: YS 110fz engine problem
 

Lean out the regulator adjustment.....Its is likely too rich on the regulator. This is the dripping. If the there is no dirt or debris in the regulator then its too rich...you need to dial the screw in slightly (CW direction) to lean this out. This puts compression on the little spring holding the plunger closed. If the plunger does not close then it will leak. Two main causes of it not closing are dirt, or not enough spring force. This is how the regulator works. You adjust the screw to vary the compression force on the spring. More force on the spring means the plunger will take more force before it opens, and will close sooner. This means less fuel flow. A dripping condition means its allow too much fuel through. So its opening to soon and staying open too long.

As I said before dirt and debris will get in this plunger mechanism and can keep it from closing.

Also what is the condition of the glow plug. Usually a bad glow plug will not idle well and will quit when throttling back.


next question is what fuel and prop are you using....too much load on the prop will cause the engine to over heat and then it can die on throttle back too.

What ever fuel you choose for prop and fuel the engine should run around 9000 to 9500 rpm for best results.



Troy Newman
Team YS

RE: YS 110fz engine problem
 

Thanks Troy.
I recently opened the regulator and cleaned up. There was a small piece of the rubber seal. After that, it run the same way. I will try to blow the little holes, and see if there some dirt. Is there a way to clean every hole, maybe a thin needle or something like that?

I have closed, for small amount each time, the regulator, to the point of a stable mid range and a great transition to WOT, but again, after a few minutes, the problem appear. I also opened and closed the low needle, to get a steady idle, but it always drip. If i close the regulator to stop the dripping, the engine dies at 1/3 throttle after flying a few minutes. I thought it was getting too hot, but the samething happens with the cowl off. The engine is in a venus, using a hatori muffler with almost all the head out.

I am using an apc 15x8 and wildcat ys2020 fuel. Maybe the plug is old, so there is a thing to change. It past the 9000 rpms 9400 if I remember correctly.

The fuel system and lines are more than checked and rechecked, not only for me.

Sorry to be this long, but I really want to make this engine run properly.

RE: YS 110fz engine problem
 

Just hooka clean fuel line to the ports and pump fuel through them while the regulator is off. A cmall can of compressed air with a small plastic tube on it can be used. Don't use anything metal as it can damage the port or break off inside the port. If compressed air or fuel flow freely...then you are in good shape. Also look at the plunger area and see if there is a piece of debris in there.


Troy

RE: YS 110fz engine problem
 

Good day, gents. I purchased a YS-110Z s version a couple months ago and it is absolutely wonderful. It's in a World Models Tai-Ji 90 and is actually too much power for that plane. Since I'm new to this engine, and pattern flying for that metter, I am trying to learn as much as I can. I was first using YS-20/20 fuel with a 15-8 prop. It flew well but one of my flying buddy's convinced me to go to Cool Fuel 30% heli fuel and am now using a 16-8 prop.
After adjusting high and low speed mixtures I noticed that there was fuel dripping from the cowling so I adjusted the regulator CW about 1/4 turn. I believe that this leaned the flow through the regulator, but I'm not sure. My concern is that even though I have a 16 oz fuel tank I am only getting 8 minutes flying time, at most, when I keep the throttle averaging about 90%. The high-speed mixture is still set rich, to keep the engine cooler; the low-speed mixture is set for a constant at 2,000 rpm, and the transition from low to high speed is smooth. I'm a novice at adjusting the regulator and I'd like some input on how to reduce the fule flow. I should be able to get more flight time than this. Any comments?

RE: YS 110fz engine problem
 

Please start a new thread on this subject this doesn't really apply to the above problems...

A little drip form the carb at idle is sometimes normal. Also make sure to filter filter filter your fuel. Any little crumbs or gunk will get in those regulators and keep them from closing down. I put a filter on fueling jug to keep the crap in the jug. Then I have a filter on the model up near the engine so that anything that gets into the tank or the filling lines doesn't get to the engine.


Your engine is running just a little rich. I has the 110S and on a 15-10 APC with the 30% heli. My model has a 20oz tank and I fly with probably an average throttle setting of about 1/2...I get about 14mins. So your numbers are not too far off. Considering you are mostly at full power.

You are likely flying with a little too much throttle to conserve fuel. This combined with a rich setting on the top end....you are going to see more fuel flowing through the engine. The engine will make a ton of power as you have seen but it takes fuel to do it.

Now that you have it setup correctly. Which what you describe with the 2000rpm idle and the transition you describe......use a tach and peak the engine to max RPM and back it off 200-300rpm from that peak to the rich side.. This is the proper High speed needle setting and will make sure you are not too rich. You should be able to do this after about 10-15 runs on the engine. Another thing to look at is your tappet adjustment. This will affect power output...not really mixture...but if they are not adjusted properly and too loose it will make things less efficient and perhaps your extra fuel might be going through and out the exhaust stack.


Troy Newman
Team YS

RE: YS 110fz engine problem
 

Hi mtroje. If the Tai Ji is a light airframe, you could try a 15-10 prop, so you can fly at lower rpms when going straight level.
By the way my engine is runnig fine now, and i just bought a new 160dz for my comp. plane.

Thanks Troy for the support.

RE: YS 110fz engine problem
 

Thanks Vacaman. Glad to have helped.

Troy

RE: YS 110fz engine problem
 

Troy,

Thanks for the advice. I've set up the high speed and low speed just as you suggest, so we are on the same page there. I also filter at the fuel can and filter before the regulator. I'll get a 20 oz tank and try keeping my thumb a little lighter on the throttle. I'll also try the 15-10 prop. All good tips, and I'll start a new thread next time. First time user, and all that.

Also, thanks for the tip on the tappets. Having run about a dozen tanks of fuel through it, breaking it in and flying, I'm very very happy with the performance of this engine.

Thanks again!

RE: YS 110fz engine problem
 

No problem Good flying


Troy