RunRyder - Question for YS gurus

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Engines Plugs Mufflers Fuel > Question for YS gurus

Bell427
Heliman
Location: St. Louis, Missouri

I have a YS 80 ST3 in my fury and I have a problem I have never seen before. The motor is fairly new having only about 2 gallons through it so far. I have just started taking it up and doing some basic rolls and loops with it and this is where I get my problem. When I transition into inverted, the engine hiccups and misses and then seems to be ok once inverted. No other YS motors (or OS motors for that matter) that I have seen do this, inlcuding the ST2 in my other Xcell.

Needle settings:
High end: 2/3 of a turn open
Hover: 1 full turn
Low end: 1 1/4 turns open

I know these needle settings are lower than the recommended settings, but it wont make any reasonable power even for a new motor) at anything richer. Even at these settings, I am still getting really good smoke at all throttle settings. (CP 30) I am pretty sure the check valve is working because after the end of a flight, the tank still has really good pressure after I get back to the bench.

Just a little info that might be relavant or not:
While myself and a couple of my flying companions troubleshot the fury, we tried taking it and holding it in different attitudes while it was at a high idle. When we held it upside down, it leaned up significantly, and then got rather rich when we turned it back upright. The header tank is slightly lower than the carb, but we tried it with the header on and without with no change in reaction.

I am totally lost on this one so if anyone has any suggestions, I am ALL EARS. Thanks in advance.

Eric

04-15-2002 Over year old.

rickc
Elite Veteran
Location: Creve Coeur IL. (Peoria Area)

Swap out the throttle barrel with a ST-2. Give YS Performance a call, it's a known problem with the ST-3. They will send you one for free; just send your old barrel back to them. Talk to Rich, he sent me mine first for I would not have down time. It takes about 5 minutes to change out the barrels. The motor will run then like it was suppose to.

Rick

04-15-2002 Over year old.

HOMEPAGE

Bell427
Heliman
Location: St. Louis, Missouri

Well I have to say this is the first I have heard of this. I will have to give them a call and see what can be done. Thanks a lot for the info.

Eric

04-15-2002 Over year old.

z11355
rrMaster
Location: 10000 is enough time wasted.

Bell,
It's true. Richard @ YS sent 2 barrels for my 'older'
80's and on the latest ones (in the last month),
they are coming from the factory w/ the ST2
barrel (ie. your gonna need a throttle arm
extension). The problem shows up when going
inverted and is worse using a GV1. Just
do a barrel swap.

04-15-2002 Over year old.

HOMEPAGE

Bell427
Heliman
Location: St. Louis, Missouri

The barrel on it right now has a short extentsion on it that looks factory. I guess from what you are saying, I have an older style barrel? I have an ST2 sitting in a box right now that is about 6 or 7 months old waiting to go into a scale project. Would that barrel work in the ST3?

Eric

04-15-2002 Over year old.

rickc
Elite Veteran
Location: Creve Coeur IL. (Peoria Area)

Ya it's the same as they will replace your ST-3 with, you do have the old style ST-3 barrel. You can swap your ST-3 out with the ST-2 you have sitting right now and then replace the ST-2 barrel when you get the new one from YSP. You'll be up and flying tomorrow provided you have a throttle extention with a YS.80 that does not hiccup.

Rick

04-15-2002 Over year old.

HOMEPAGE

Bell427
Heliman
Location: St. Louis, Missouri

Good because hiccups inverted really UP the pucker factor, more so than I care for with a new bird. I'll swap them out and see if it cures the problem.

Thanks again guys for the help.

Eric

04-15-2002 Over year old.

Bell427
Heliman
Location: St. Louis, Missouri

Good because hiccups inverted really UP the pucker factor, more so than I care for with a new bird. I'll swap them out and see if it cures the problem.

Thanks again guys for the help.

Eric

04-15-2002 Over year old.

sluggo
Elite Veteran
Location: Kitchener Ont

HEHEHE I just went through this with my ys 80. Man I almost **** whenI was about 6 inches off the deck inverted and it started to hiccup like crazy. To make it worse I had the GV-1 turned on and boy was it unhappy about it. Got the new barrle in today and tryed it out (with gv-1 turned off) and all is well again. It really helps to smooth out the engine.

Bell427 thoughs needle setting are not to far off mine and I only have 5 tanks through the motor. It would not even lift off the ground with the settings they gave me in the manual.

Chris

04-15-2002 Over year old.

HOMEPAGE

Dave_D
Key Veteran
Location: Philippines

You guys have me spooked now.

I am just running in a YS80 on the Freya for the past couple of weekends. I was aware of the throttle barrel swap on the engines bought thru YS Performance, but of course that serves me little since I am in Asia.

I have attempted inverted hovering with it and I can't notice the hiccup you guys mention. As a precaution, I kept my inverted hovers at least 30 feet off the deck so in case it does show up, I can at least bail out with altitude to spare.

I do keep the GV-1 off since I prefer to fly this way. Can you guys please expound more on the problem so I can find out if mine is affected. I bought this engine new around December and was probably imported around first week of Nov 2001.

04-15-2002 Over year old.

Bell427
Heliman
Location: St. Louis, Missouri

GV-1 issue

I also have the GV-1 and noted that whenever I turned it on, the throttle would hunt wildly. The more I leaned it out, the better it got. Yesterday was the first day I have been able to turn on the GV-1 in both normal and idle up 1 without it hunting really bad. It was also the day I had leaned it out the most. First time I turned it on it sounded like it was taking the throttle from about 25% and running it up to about 80% and then back to 25% and back up to 80% and back and so forth. It was really weird. I dont know if thats what everyone else was experiencing, but thats what was happening to me.

04-15-2002 Over year old.

Dave_D
Key Veteran
Location: Philippines

Thank you very much for the valuable info.

I will try this out on the field this weekend and confirm.

So is it safe to assume that the problem manifests itself whenever the GV-1 is on, no matter whether it's inverted or not? I think it's safer for me to test with the heli upright

04-15-2002 Over year old.

Dirty
Senior Heliman
Location: Des Moines, Iowa, USA

I noticed the problem even without the GV-1 before I put in the ST2 throttle barrel. I really have to run the needles a lot lower than what the manual recommends though if I want to have any power.

04-15-2002 Over year old.

Dr.Ben
Elite Veteran
Location: Richmond, VA, USA

The problem generally occurs entering the inverted portion (transition through zero degrees of pitch) of a roll or any other place where the GV-1 is likely to close the throttle down enough to pick up the rich spot. Mine did it in 540 stall turns, as well. The problem is magnified because the governor doesn't understand the rpm drop, and then shoves a bunch of extra throttle in to compensate.

The one saving grace about it is that the motor doesn't seem to want to cut off even in the worst instances. The spook factor is enough to do the barrel swap, though.

Ben Minor

04-15-2002 Over year old.

a_korandr
Veteran
Location: Chicago, IL

ys80 + gv-1

i had this engine misfiring during loops, rools, flips, nose dives. This is happening at 0 pitch and a free fall most recognisably.

i followed the suggestion to replace the barrel, and got one from YS-Performance. Installed it and had a great difficulty to start the engine. When the barrel mark is positioned against 'L' it looks like the carb is fully closed (can not check it on installed engine).

So the mark must be between 'L' and 'Hover'.

During hovering it worked perfect, but in hovering at 1800 gv-1 was moving the throttle back and forth. I have not tuned the needles yet to their perfection. And can not tell if the effect of ys80/gv-1 is gone away.

I used to fly with the gv-1 always on, as i love constant rpm.

PS:i installed thr. extention and mechanically it works perfect.

Andrey.

04-16-2002 Over year old.

gforce
Veteran
Location: Jacksonville FL

Looks like I am going to have to do a barrel swap also. Will ys performance send you the extention you need, or do you have to get that from somewhere else. If so can you point me in the right direction. Thanks!!!

04-17-2002 Over year old.

rickc
Elite Veteran
Location: Creve Coeur IL. (Peoria Area)

The extention is on you, HeliProz has some very nice ones.

Rick
http://home.grics.net/rickc/DBYSARM.gif

04-17-2002 Over year old.

HOMEPAGE

Dr.Ben
Elite Veteran
Location: Richmond, VA, USA

Go down to your local hardware store and buy a little nylon spacer. They come in various lengths. Use a small star washer between the control arm and the spacer and the spacer and the barrel. Add a 3mm bolt of corect length, a little loctite, and you're all set.

Just another means to the end. It'll all set you back about 50 cents.

Ben Minor

04-17-2002 Over year old.

av8er
Senior Heliman
Location: NH, USA

well, i will be using gv-1, and have had good luck with 0S#8 with cool 30%....all these engines have this prob? just got engine last week....my arm is 1/4 inch from barrel, which sounds like the old version....unless they updated, is there another identification on the barrel itself? Installing engine now, so posted in main hoping to get faster reply? errr...damn why can't they work these things out first!!!!

04-17-2002 Over year old.

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