YS 63: P.O.S.???

John Hawkins - From Canada's Atlantic Coast

I'll never knock the quality of YS engines. I'll never say that they are not in a class of their own.

If you have lots of energy and like to stay abreast of all that is going on with them, and are connected well in the hobby so that you actually find out what is going on with them, then they can be loads of fun.

My observations of YS engines have been made mostly of other people. I have owned quite a few, but haven't flown that many of them. I love engines, that's why I have owned quite a few of them. Some of my pattern friends are still flying YS engines. There really is no alternative for many folks. Certainly there isn't to me, at least not for pattern. I've learned about them, spent many hours helping those with errant engines and have become familiar with the various models over years.

Time changes everything. I haven't flown competitively for years, so I do not have to worry about a displacement limit. If I need more power, I simply use a larger engine. Suction feed provides me with all of the fuel metering performance that I need, most of the time. When it doesn't, there's always Perry or Cline to fall back onto. When I go to order an engine part, I don't have to worry whether the parts dispensing person has heard of me in the pattern circuit before. You know how that goes. When parts or engines are scarce, the big boys get them and the rest of us have to wait until the next batch arrives. BTDT. I'm not talking about the current parts dispenser. This happened in the past. Boy was I pissed.

Any how, whenever I see an average Joe looking at one of those engines, I keep my mouth closed. If asked, I will explain my reasoning for passing one up and then I'll drop it. Half the time they go ahead and buy it anyway. Then, after wrestling with it for a while, they won't look me in the eye any longer. I hate that.

Ed Cregger

Paul, so you have two YS engines that are no problem. So do I. But you know what? It didn't make a damn bit of difference to the third that didn't. As far as the engine not running up/down unless the throttle is changed that is dead wrong. There is a problem with blow-by in some engines which causes this problem by "playing hell with the regulator". At least that is the impression Dave Shadel seems to be working under and those are his words. The gas port modification he developed to overcome the problem is now OEM. There have also been similar problems caused by leaking air boxes. To believe you can simple adjust these problems out is to believe your dick will grow three inches longer over night if you just take those pills. ;-)

John Hawkins - From Canada's Atlantic Coast

will grow three inches longer over night if you just take those pills. ;-)

Hey, I'll have you know that I've been taking advantage of every single 'Increase your penis size' SPAM email I've been getting for the last 3 months, and my penis is now 47 metres long....... ;-)

MrBonk

Well, I USED to be a roadracing mechanic, but that was 25 years ago.

Excellent! This could be very useful. Say a fellow gets his plane caught high up in a tree. He could just pop a few Viagra and flick it out. Imagine the joy too of never being caught short for a skipping rope. :-)

John Hawkins - From Canada's Atlantic Coast

Hi, We have 4 YS 63 in our club. They all run fine.

My YS-63 consumed about 10 gallons. The only problem I had some time ago was that the engine was not running reliable on idle. After cleanig the non retrurn valve the problem went away.

Regards jakob strebel

Does your tank have any air pressure in it after idling the engine? I have a YS63 that does this a couple of times a year. This condition is caused by the check valve getting stuck . There were some bad check valves around. Open the valve and clean it out. There is a plastic piece in it that does the work. When the tank doesn't hold pressure, or isn't getting any pressure from the engine, it will idle all day, but as soon as you open the throttle it will quit.

Greg

occasionally

I replaced the check valve and got a new one so I doubt that is the problem

you mean the check valve?

Well....I have a new one that sticks. You do have a closed fuel system? There should be pressure in the tank. When you pull the fill line you should get a noticeable air hiss.

Greg

Same here. I have two .45s and one .40 in service. Damned fine engines, if you ask me. Especially with a good pipe on!

Kev

Hi Kevin, I've only ever run my .45 with the standard muffler (the huge, cylinder shaped one with the flat exit end) 'cause the rules for the class I was racing state that you must run the muffler that comes with the engine. What sort of pipe are you running on yours?

MrBonk

Some engines MIGHT require more run time than what you have so far.

What plug are you running?

Try adjusting the idle mixture.

If you're inclined, you might try pulling the throttle barrel out and checking it and the carb housing bore for scratches.

There is always the possibility that it was defective from the factory. Send it back if it can't be corrected. Warranty or not, they SHOULD stand behind their product if it's giving problems right out of the box.

Greg

Funny you should ask that, because it's been so long since I got these engines, I don't even remember the mfg name of the pipes. I run one .45 with the black, slender pipe that looks like it is "pressed" or "rolled" into shape. On the other .45 I run an adjustable pipe (can adjust length with the silicone coupler) that is machined from aluminum. The black pipe has the header built-on, and is very lightweight. The aluminum one uses a seperate header and is joined to the pipe with silicone tubing, and is a couple ounces heavier. They are both commercially made pipes. The aluminum one seems to produce a bit more power than the black one, after fidgeting with the length to find the proper tuning.

HTH, Kev

Macs Products,

makes a good pretuned system for that engine. I was using one on an ST .51 and it really screamed! Put out more power than many of the .61 engines around.

Macs!! Yes...that's it, the black one is a Macs. Still don't remember who makes the machined one, though.

Kev