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HomeRC & PowerAircraftHelicopterEngines Plugs Mufflers Fuel › YS 91SR FLAMING OUT
10-17-2010 11:57 PM  8 years agoPost 1
RACER7696

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Ma

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Guys, I am having a problem with a ys 91sr. I bought the engine used from a fellow rr member and it had just been serviced and had a new piston and liner in it due to what I believe was a pressure line coming off. Anyway I installed this engine in a 700le and set everything to the factory settings The first half a gallon was uneventful and just as I made the hover needle one click leaner and the high one click leaner again this is from factory rich the engine flamed out. When I got the engine up on the bench I noticed there was no tank press. I checked the usual list and determined I may of had a bad fuel line. replaced everything and pressureized the system on the bench and it held overnight.Now when flying it the first few minutes are perfect the engine outs out alot of smoke the tail holds great and it seems just as the engine builds up some heat the tail will start waging like crazy you can hear the head speed changing and sometimes it will just quit. Now if I richen up the hover setting much past braekin it just runs like crap tail all over the place and four stroking. Tonight after the second flame out,when I pulled the presure line off the tank I noticed that there wasnt much tank pressure. Ther was a little but not where it should be.The check valve checks out ok So I am wondering if it could be a regulator problem. Right now the engiine has plenty of compression and the check valve is ok I have recently had the carb out and cleaned everything and the lines are all brand new and they all have fuel tubeing clamps at all of the pressure connections to help prevent leakage.So dont know if I should send it in to be looked at or keep screwing with it but no matter what you do if you go richer or leaner doesnt seem to make the engine happy. The engine specs are ys91sr kasama header hatori pipe.

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10-18-2010 12:15 AM  8 years agoPost 2
Gernejr

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Miami, Fl

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Try a new pressure valve . I have one that ceck out perfect but drive me nuts, put new never had another problem. Also did you try new glo plug? I've ran OS8 but really like Enya 3 in SR.

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10-18-2010 01:54 AM  8 years agoPost 3
RACER7696

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Ma

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no I havnt tried the enya but I have one. I just tore down the whole engine and there wasnt anything out of the ordinry. carb loooked graet also. The only thing I saw was when I took the carb off the engine the gasket that goes between the carb and isolator block there was a liitle piece of the gasket that could have been partialy blocking one of the small holes,again not shure though

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10-18-2010 09:45 PM  8 years agoPost 4
airdodger

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Johnston USA

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Try a Hatori Header, if the new check valve does not do the trick. I don't know how much pressure you used to check, but I use around eight psi, you can not have any leaks for the system to work correct. You could have also hurt the ring, but that is the last thing to try.

Chris

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10-19-2010 02:52 AM  8 years agoPost 5
Gernejr

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Miami, Fl

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I really think the check valve is the problem. I've run ST,SR and 3DS with Both stock v1 and v2 hatori headers and kasama header, Perfer 3ds and Kasama On the hatori SB19 pipe with Enya 3 plug. If all you hose is good ,tank has no leaks, Valve is 3 15/16" (4" from backing plate , motor checks out ,Carb is clean ,It should run great en=even setup rich....

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10-19-2010 03:23 AM  8 years agoPost 6
RACER7696

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Ma

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Any one having problems on trex machines with the second ruuber gromet in the tank leaking

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10-19-2010 11:57 PM  8 years agoPost 7
RACER7696

rrApprentice

Ma

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bench tested the engine today and it ran great. So when I went back home I pressure tested the tank with 18psi,the tank held that pres for over an hour then I relieved it. I was hoping that the second tank bung or something like ts leaking now I dont know what the heck could be going on. If useing a fuel magnet should you not run an additional filter? Something in the trex itself is causing a fuel starvation problem just cant find it. Maybe it was the check valve after all,even though the old one checked ok maybe there was something wrong.Anyway thanks for everyones time so far

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10-20-2010 04:24 AM  8 years agoPost 8
Gernejr

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Miami, Fl

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Does that mean you changed the valve?
I run the OMI fuel magent and Clear Align filter (HN6021) that you can clean/change filter. I'm also using align stock fuel hose 2.5 id x 5mm od. (HN6020-1) outside hose and 2.5id x 4.5 od inside the tank...

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10-20-2010 04:56 AM  8 years agoPost 9
Machinehead01

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Lower Michigan

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Think you found your problem...
[/quote]The only thing I saw was when I took the carb off the engine the gasket that goes between the carb and isolator block there was a liitle piece of the gasket that could have been partialy blocking one of the small holes,again not shure though[quote]

And fixed it.

Tom

"You judge according to the flesh; I am not judging anyone."

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10-22-2010 01:51 AM  8 years agoPost 10
RACER7696

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Ma

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havnt got to try it yet due to northeast weather but will post soon as I do

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10-23-2010 10:45 PM  8 years agoPost 11
RACER7696

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Ma

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ready to firebomb engine and heli
Guys I am so frickin frustrated right now.I flew the 700 again today and still no luck. I fire it up it runs awesome for about 4 mins then its like you were to walk beside it and pull the fuel line right off , I mean it goes out that quick.put it on the bench it has tank pres.I even made up new fuel line without a fuel filter to make shure the filter wasnt sucking air and still nothing.Bench tested last weeek and ran great cant figure it out. Everything has been,cleaned ,replaced and tank will hols 20psi for over an hour with no drop off whatso ever. Is it time just to go get an o.s.,but I really like how it runs when it runs. Maybe it is the regulator

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10-25-2010 02:06 AM  8 years agoPost 12
RACER7696

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Ma

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just tested the tank again and it holds 25 psi indefinetly. Realy stuck on this one why would it run perfect for three or four mins then completly flame out like you shut the ign switch of on a car doing 80 down the highway.

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10-25-2010 05:05 AM  8 years agoPost 13
tadawson

rrElite Veteran

Lewisville, TX

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Whenever I have had an engine do that, it was overheating, either from being too lean, or an inadequate cooling system.

- Tim

Friends don't let friends become electrotarded . . . .

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10-25-2010 05:52 PM  8 years agoPost 14
Chuckie

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Crofton Maryland

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What does the ring look like? Can you take a picture and post it?

Please stand by for faster service!

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10-25-2010 10:20 PM  8 years agoPost 15
RACER7696

rrApprentice

Ma

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motor has plenty of compression . The cylinder and piston look brand new and are sealing perfectly.Today after running one line from the tank wuthout a filter I got the engine to run for a full tank, However at the end of the run with about an inch of fuel left the engine started to go lean .Now I was out 1.75 on the hover and 1 turn on the high. When I landed the back plate was just a tad warmer than I would like to see.I richened up the mid range to two turns and the high to 1.25 this time the engine seeemed to not be running as good,the tail was kicking and it had that sound like it was starting to go lean.Now at this point the smoke was good coming out and when I went to idle up The smoke defineitly diminshed so I landed it and opened up the high a quater of a turn so now I am out 1.5 turns still sounded a little lean and when I landed the backplate was still untouchable or very hot. How can I be this rich and still have a lean engine

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10-26-2010 02:35 PM  8 years agoPost 16
Chuckie

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Crofton Maryland

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I was asking about the condition of the ring. Is it silver looking or dark brown? If silver then it's gone and needs to be replaced. You can look into the exhaust port but to be sure the back side of the ring should be checked by removing and inspecting the entire ring. If you overheat the motor the ring will loose its temper and be too soft. The compression might be fine by hand but it's not sufficient when running at 16000 rpm.

If the tank has no pressure then the motor will run lean then hot. The tank builds pressure when the piston is driven down but if the ring is gone the engine can't push air into the tank. The only other place for the air to go on the downward stroke is toward the front of the motor through the bearings around the crank. Unless the check valve, fuel lines, back plate are leaking. Some air is directed to the regulator to pulse it but I can't imagine a lot is going out the front bearing.

If your tank system is holding air but you don't have enough air in the tank when running the motor then the engine is not producing enough air in the first place.

Please stand by for faster service!

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10-27-2010 12:20 AM  8 years agoPost 17
RACER7696

rrApprentice

Ma

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thanks guys, Sending the engine back to ys to be checked out. Today I had the chance to get an os 91 with the reg at cost so I bought it. I am very happy with it.So when I get the engine back from ys I will have a kasama header a hatori pipe aand an engine for sale. I dont want to turn this into an os ys thing because I love ys engines and they make awesome power. But after th6 weeks of struggleing with it and the oppertunity to get a good deal on an os I decided to take it because I didnt want to wait three more weeks to fly this heli. I got to tell you the 700le flies awesome with the microbeast.

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