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HomeRC & PowerAircraftHelicopterEngines Plugs Mufflers Fuel › Motor has lost all of its punch..
04-24-2009 02:13 AM  9 years agoPost 1
Cameron

rrKey Veteran

St. Johns, Florida

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This os 50 has about 10 to 15 gallons on it, I can't keep track. I have replaced the ring once after a bad lean run. After that it had good power but it has slowly lost all of the pull it had. It is taking it a few seconds to get back head speed after it gets a load on it and loses rpm. I do know how to tune the engine and all the plumbing is okay. Does the piston and sleeve look alright?

Thanks,
Cameron

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04-24-2009 03:35 AM  9 years agoPost 2
glydrjocky

rrApprentice

Livermore, CA - USA

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Crosshatching
How was the crosshatching on the cylinder walls when you installed the new ring after the lean run? The crisscross markings in the cylinder walls help the ring seat to the cylinder while its breaking in. You dont want perfectly polished cylinder walls or any left over glazing from the lean run if you want the cylinder, piston and ring to deliver full power over its service life.

I noticed some very shiny spots on the ring near the ring gap like overall contact to the cylinder wall is very poor or the ring got hot and glazed during breakin at which time the break in is not complete and the engine will never develop full power.

It's hard to tell what your cylinder wall looks like from the photo though.

The only people who truly know where the edge lies, are those who have gone over.

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04-24-2009 03:49 AM  9 years agoPost 3
Cameron

rrKey Veteran

St. Johns, Florida

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Looking at the liner there still is crosshatching but I also noticed that those shiny spots on the ring correspond to shiny dark spots on the liner.

Cameron

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04-24-2009 05:08 AM  9 years agoPost 4
glydrjocky

rrApprentice

Livermore, CA - USA

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That doesnt sound too good actually. I think the liner needed to be re-crosshatched or at least deglazed before the new ring was run in on it. I noticed alot of varnish on the piston as well.

In order for the ring to break in and transfer heat to the liner efficently it needs to wear in to the cylinder wall properly. Seems like there were some hot spots that formed during the break in process that caused varnish to form on the ring.

Sounds like the ring never seated properly and the liner may have taken the brunt of the damage.

This may require starting over with new parts if the cylinder doesnt clean up.

The only people who truly know where the edge lies, are those who have gone over.

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04-24-2009 05:10 AM  9 years agoPost 5
tasmanian devil

rrApprentice

DeSoto,Tx.

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Just replace the piston,ring,and liner and get it over with.

I do'nt crash,I just rearrange parts.

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04-24-2009 05:12 AM  9 years agoPost 6
Cameron

rrKey Veteran

St. Johns, Florida

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What would be a good break in procedure. I will just order new parts for now, piston, ring and sleeve, and will see how it works.

Cameron

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04-24-2009 05:13 AM  9 years agoPost 7
JJMAN (RIP)

rrVeteran

Chesapeake, Virginia - USA

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Take the crank out and check the rear bearing, it probably needs replaced. I personnally would replace the liner/piston/ring, to get max output. But if your not looking for that you could clean it all up and use it, but replace the bearing at a minimum. Its your choice.

JAY HIGGS

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04-24-2009 05:16 AM  9 years agoPost 8
Auto180_OCMA

rrApprentice

Futaba City Z (Mobara)

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I would re-built it
I would re-build it, New Piston, Ring, Rear Bearring.

AMA 334000

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04-24-2009 05:16 AM  9 years agoPost 9
DaOne

rrApprentice

Prineville, OR - USA

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If it was me I would get a new ring, lightly hone the cylinder with a brake cylinder hone and with very fine sandpaper dull any sharp edges of the scratches on the piston skirt. While I had it apart the bearings would get changed. Break it back in and should be as good as new.





www.alumafx.com

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04-24-2009 12:04 PM  9 years agoPost 10
airdodger

rrElite Veteran

Johnston USA

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Get a new liner , piston, piston pin retainers too,(they are only made for one install), ring and bearing if you want like new performance. This time don't run it as lean. You need to be up to temperature during break-in, being careful not to get so hot that the oil burns on the liner wall and glazes. NO big loads on the engine for a few gallons it will pay off.. Sanding the piston is not a good idea, the grit can embed in the piston even if you think it is perfectly clean, use a file if dressing the piston.

Chris

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04-24-2009 12:48 PM  9 years agoPost 11
ScottG

rrVeteran

Ft Wayne, Indiana

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For all the cost and trouble plus shipping, it might be just as well to buy a new Hyper. They are on sale for $169.98 at tower... just sayin....

http://www3.towerhobbies.com/cgi-bi...?&P=SM&I=LXHGN9

Scott

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04-24-2009 02:34 PM  9 years agoPost 12
DS 8717

rrProfessor

Here wishing i was somewhere else

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Get a YS,they last longer and have more power with the right muffler.

YOU ONLY LIVE ONCE..IF YOU LIVE IT RIGHT THATS ALL YOU NEED

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04-24-2009 03:24 PM  9 years agoPost 13
JJMAN (RIP)

rrVeteran

Chesapeake, Virginia - USA

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Not everyone agrees with that, me included.

JAY HIGGS

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04-24-2009 03:50 PM  9 years agoPost 14
baddynergy

rrElite Veteran

sierra madre, ca- usa

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Looking at your pix and its hard to tell, but if the rings ends are where they were when it was installed. It looks like they are off about 45Deg from where they should be. Which would cause all the trouble you had.

**Unattended children will be givin a shot of espresso and a puppy**

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04-24-2009 04:18 PM  9 years agoPost 15
CoronaL

rrKey Veteran

Winnebago IL

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I think that piston and liner are old. See the hair growning out the ring land

Randy!!! I am the liquor

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04-24-2009 05:18 PM  9 years agoPost 16
LONEWOLF2440

rrElite Veteran

MYRTLE BEACH S.C

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I did a trade for a 600n motor had no power better to just buy a new one. Rebuilding saves ya alittle money

MIKADO LOGO 600 TREX 550

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04-24-2009 06:16 PM  9 years agoPost 17
tadawson

rrElite Veteran

Lewisville, TX

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Not everyone agrees with that, me included.
Hey, *SOMEBODY* has to be wrong . . . .

- Tim

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

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04-24-2009 09:55 PM  9 years agoPost 18
ch-47c

rrElite Veteran

san jose, ca

My Posts: All  Forum  Topic

Get a YS,they last longer and have more power with the right muffler.
I agree. I like YS and Hatori mufflers so much now, no more OS engines in my helis. However; some guys have posted ruining a brand new YS on the first tank from lean runs. It seems a lot of guys are trying to wring-out the most power from their engines of any brand by leaning out to much and too soon in the engines life.

Cheaper to replace the Hyper with a new one at current prices.

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04-24-2009 11:03 PM  9 years agoPost 19
Cameron

rrKey Veteran

St. Johns, Florida

My Posts: All  Forum  Topic

I am just going the the easy route and buying a new os motor.
Thanks for all the input.

Cameron

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