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HomeRC & PowerAircraftHelicopterEngines Plugs Mufflers Fuel › Beware don't ruin your 91srx or 96srx YS Engines
07-18-2017 03:53 PM  17 months agoPost 1
ssrobzoom

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Tn

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Beware don't ruin your 91srx or 96srx YS Engines

Purchased a 91srx which needed rebuilding. Installed the new liner, piston and ring. Read the manual for the break in procedures. .

On the break in procedures which are in the manual the 91SRX and 96SRX states to start at 1.25 and 1.25 on the Hover and high (Full) needles, but this is wrong. Found out from another flier this should be 3.00 turns out on both needles, then tune as needed.

Below is directly from the manual:

START UP
1. Always remove Tube(A) at the check valve first
before fueling. The fuel tank is pressurized and you
need to relieve the pressure first. Disconnected
Tube(B) at the filter and fill the tank. Reconn-
ect Tube(A) and (B).
2. From the fully closed (clockwise) position, turn the
needle valves counter clockwise as follows.
● Hover 1.75 open 1.75 ~1.50
● Low 1.25 open 0.75 ~0.50
● Full 1.25 open 1.25 ~0.75

This is only to inform others not meant to bash!
I wish YS would correct the manual so many others don't fry their new motors.

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07-18-2017 04:00 PM  17 months agoPost 2
EEngineer

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TX

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Doesn't it seem to run incorrectly with it being so lean?

Logo 600SXs, 800XX, TDR IIs

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07-18-2017 04:26 PM  17 months agoPost 3
tadawson

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Lewisville, TX

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Yeah . . . gotta wonder if it's the docs, or if his engine isn't building correct tank pressure . . . either will be lean. I can't ever recall ever needing 3 turns on any YS I have owned (but then again, I have never specifically owned either of the models mentioned).

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

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07-18-2017 04:49 PM  17 months agoPost 4
Darren Lee

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Woodstock, GA

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I started my 91SRX out at the listed 1.75/1.25 turns and it's run like a sewing machine for 10 gallons now. Definitely not lean.

Team Synergy / Rail Blades / Morgan Fuel

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07-18-2017 05:41 PM  17 months agoPost 5
EEngineer

rrProfessor

TX

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"engine isn't building correct tank pressure"

While the timed crankcase pressure regulation is awesome, it can be cantankerous....and cause lean running, even if the needles are set correctly.

Logo 600SXs, 800XX, TDR IIs

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07-18-2017 07:17 PM  17 months agoPost 6
gt48

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Kingston, Ontario - Canada

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Had the same issue last year with 91srx tareq. Here's a thread:

https://rc.runryder.com/t803974p1/

In post 15 vid Tareq recommends 2 turns out if I recall.

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07-19-2017 06:02 AM  17 months agoPost 7
jjeaster222000

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Bedford in

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Yes I seen that in the manual. After talking to a few YS pilots I was told by everyone to start out at 2.5 turns out on Both needles. Ended up being about 1.75 out before it would make any heat. You would think that they would put out a warning and re do all the manuals.

Team Synergy

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07-19-2017 02:48 PM  17 months agoPost 8
ssrobzoom

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Tn

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So just the motor going and set the needles at 3 turns out and still the backplate is very hot. What could cause this?

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07-19-2017 07:14 PM  17 months agoPost 9
tadawson

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Lewisville, TX

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Bad check valve, reversed check valve, wrong backplate fuel line length, bad regulator, tank leak, vent left open . . .

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

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07-20-2017 03:28 PM  17 months agoPost 10
Richardmid1

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Leeds, England

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How hot is very hot? You can't really go by back plate temp though. Is there plenty of smoke? Is it blowing plugs? Does it hang on the pipe when hitting throttle hold or does it come straight down to idle?

Exhaust coming loose/leaking? Black oil stains round the exhaust gasket?

60% of the time, it works every time!

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07-24-2017 02:12 AM  16 months agoPost 11
ssrobzoom

rrKey Veteran

Tn

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To hot to hold your finger on for 4 seconds!!

But finally got it running correctly with the help of Geena Tucker, Kudos to Geena!! It was the Regulator adjuster which is not supposed to be touched since it set at the factory, which I didn't but the engine was sucking air at that location. So, we had to re-seal the adjuster with fuel proof silicon. Once sealed the motor run as it should, lessoned learned here.

Started with 3 turns out on both needles, the motor is running super cool with consistent smoke, now we can break in the motor properly then start adjusting down the needles to get the power as needed.

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07-27-2017 11:07 PM  16 months agoPost 12
FLYERCLD

rrVeteran

Proctor, Arkansas

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Question
My srx just started to surge for some reason, I have checked for leaks and all lines are good, no leaks. New Thr servo (BK7001HV) on MultiGov Pro, gov is setup by manual.

What I have notice is the clear tube/line on the motor has bubbles showing while the motor is running as if there is a leak. So, can anyone tell me what could be the problem.

Thanks,
Charles

Old pilots never die they just fade away

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07-27-2017 11:12 PM  16 months agoPost 13
EEngineer

rrProfessor

TX

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"as if there is a leak."

It's sucking air somewhere....

"all lines are good"

Are they?.....New lines?...Or old...if old, the easiest and cheapest thing to replace.

Perhaps an o-ring or gasket somewhere behind the line that the bubbles appear.

Logo 600SXs, 800XX, TDR IIs

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07-27-2017 11:41 PM  16 months agoPost 14
FLYERCLD

rrVeteran

Proctor, Arkansas

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Air leak somewhere, all my lines are new and I did check them for air leak. So, I will pull the motor and remove the carb and take a look at the both subplate, gasket.

Is it common for the diaphragm to go bad? I will order some gaskets to be on the safe side.

Charles

Old pilots never die they just fade away

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07-28-2017 12:47 AM  16 months agoPost 15
EEngineer

rrProfessor

TX

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They can....petroleum based after-run oil will ruin them.

Logo 600SXs, 800XX, TDR IIs

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08-08-2017 12:06 PM  16 months agoPost 16
FLYERCLD

rrVeteran

Proctor, Arkansas

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What fuel proof silicon did you use name/brand and where did you get it from? Is it still holding/sealed?

Thanks
Charles

Old pilots never die they just fade away

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08-09-2017 11:11 AM  16 months agoPost 17
FLYERCLD

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Proctor, Arkansas

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Got the answer.
Thanks

Old pilots never die they just fade away

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05-18-2018 03:02 AM  7 months agoPost 18
msallua

rrNovice

Montevideo, Uruguay

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How do you mount the clicker of the hover needle?

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05-18-2018 01:54 PM  7 months agoPost 19
JuanRodriguez

rrProfessor

The Villages, Florida

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msallua
How do you mount the clicker of the hover needle?
Take a look at the pictures on this link....
https://www.amainhobbies.com/ys-eng...yse0021/p231239

Been there, done that and old enough to know better.....

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05-18-2018 02:31 PM  7 months agoPost 20
msallua

rrNovice

Montevideo, Uruguay

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In the 96srx the needle seat its different ,the needle seat has "clicks"

I think I find it

http://www.lowerheli.com/ys4480-nee...t-91sr-91sr3ds/

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HomeRC & PowerAircraftHelicopterEngines Plugs Mufflers Fuel › Beware don't ruin your 91srx or 96srx YS Engines
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