Hello,

I had a YS 63 and it was so good! The secret is "Tachometer"

Follow these steps:

1) Adjust the high neddle (be careful not to lean or it'll start to "detonate" and brake your spinners). My adjust was about 1 1/2 turn from close position;

2) Adjust your trim to 2000 rpm (yes 2000 rpm) Master Aiscrew 12x8;

3) Then full trothle and back to 2000 rpm, then you have two choices:
- If after 5 sec the rpm decreases the idle is rich (open the idle about 1/8 - clockwise "yes the idle valve is the opposite from the others")
- If after 5 sec the rpm increase the idle is lean (close the idle about 1/8 - counterclockwise)

Full trothle again and back to 2000 rpm

Until you reach that point (oscilating around 2000) . And go flying it's a good engine.

bduarte,

when you said "detonate" and breaking spinners, I'm assumming that is all it is breaking, right? I haven't done any permanent damage to the ys63 by running it lean, have I?

Also, thanks for the piece of advice... I'll see if I can get it to work putting the tach to the test!

You don't have to be afraid!

The "detonate"is the term used by Clarence Lee of RCM to describe when the combustion is out of the correct point.

It happened when I was adjusting my YS 63 but nothing bad happenned, only the spinner.

Maybe if you knew that 4-strokes dont behave inverted, you wouldn't have much problems

All my 4-strokes are mounted inverted, including two YS 110's, three YS 63's, one O.S. 120, and one O.S. 91, and I never had a single problem with them.

YS 110 #1 mounted inverted in a WM Spit:

Not a single problem. Can idle at 2000 rpm all day long.

YS 110 #2 mounted inverted in a GSP Spit:

Not a single problem. Can idle at 2000 rpm all day long.

YS 63 #1 mounted inverted in a VQ Zero:

Not a single problem. Can idle all day long.

YS 63 #2 mounted inverted in a Kyosho Zero:

Not a single problem. Can idle all day long.

YS 63 #3 mounted inverted in a Kyosho Corsair:

Not a single problem. Can idle all day long.

O.S. 120 Surpass III mounted inverted in a GSP Hellcat:

Not a single problem. Can idle all day long.

O.S. 91 Surpass II mounted inverted in a Graupner ME109:

Not a single problem. Can idle all day long.

None of the engines above use onboard glow driver. If you can't get your 4-stroke to run inverted, then it's your fault, not the engine's fault.

I have a third YS 110 waiting to be installed into a Hangar 9 Corsair, and guess what, there is a 99.9% chance that it will run and idle great inverted also.

well richard, i hope that i will be able to put up the picture and that same comment in the near future!

SOLVED!!!

I have found the culprit. It is really dumb but I think it may benefit another YS inexperienced person so here goes...

The mistakes started early...

When I was fitting the fuel lines for the first time, I think I swapped them... so for those inexperienced, do use different color fuel lines for this one. In most cases, this wouldn't cause too much trouble... But in this case I think that some how the fuel and pressure somehow blew the tube with the clunk out of the tube. I've never heard of this happening before but I am just telling it like it is...

This explains why the engine was always temperamental as the gas sloshed around the tank, air bubbles would be sucked into the fuel lines to the carb. This would then cause the engine to go from rich to lean to rich to lean and the only way for me to keep it running was to make the rich rich enough so that engine rpms were high enough to pull in another bit of fuel. But as the fuel level went down, the gaps kept getting longer and soon the engine was running so lean that it detonated so violently it ruining two of my spinners.

Lesson learned? Honestly, I'm not sure... I guess don't connect it up incorrectly and be absolutely sure that the fuel pickup in the tank never slips from the aluminum tube?

great - now my question is how bout same issue with magnum 120 being inverted - will take off the quick fuel and install t's to take that issue out..but its great at high end..but cannot seem to keep it running on low end?

You cannot do the same thing on a Magnum 120. Another word, you cannot install two T's in the fuel lines. The Magnum 120 does not have built in fuel pressure regulator like the YS, so trying to fill up the fuel tank through a T will flood your engine. On a Magnum, install a third line to the tank with its own clunk just for fueling and draining. Make the fuel line attaching to this second clunk inside the tank slightly shorter than the line attaching to the main clunk so the two clunks don't interfere with each other. Also, you don't need to install a T in your vent line to the muffler. Just hook up the vent line directly to the muffler pressure fitting. When you fill up the tank, excess fuel can just run out of the muffler.

As for your low end problem, either your engine is still not fully broken in or your low end is too rich/lean. What does the engine do when it's idling? When you chop the throttle, does the engine drop down to idle, then speeds up a little and quit or does the engine slowly quit?