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HelicopterEngines Plugs Mufflers Fuel › OS 50 - The never ending story...
04-29-2004 12:47 AM  13 years agoPost 1
JWBurns

rrVeteran

The Lone Star State, Dallas Texas

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After 6 gallons the rear bearings in my OS 50 went bad. I replaced the bearings with Boca, and also replaced the piston, ring, and rod.

I also did the web modification to this motor as well.

My problem is now that the motor still will not start. Fuel is getting to the carb, the plug is hot, but it just wont start.

I am noticing fuel leaking from the head of the engine. This occurs when the glow driver is attached, and I'm turning the engine over with my starter. I removed it, and reinstalled it making certian the bolts were tight. The leak is still there.

I'm leaving for Mayday tomorrow. I am almost tempted to go out and purchase a brand new OS. God why can't YS make a 50?

Any ideas?

Jason

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04-29-2004 12:58 AM  13 years agoPost 2
Lee O'Dell

rrApprentice

Gibsonville, North Carolina

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Double check piston ring

Make sure that the ring is not broke. I broke 2 rings until I learned proper way to install......... I let someone else do it.

Just a thought.

Hope you get it worked out.

Lee

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04-29-2004 01:00 AM  13 years agoPost 3
Ace Dude

rrProfessor

USA

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God why can't YS make a 50?
I spoke to YS at the Toledo show earlier this month. Apparently they are working on a 50 size motor. I couldn't extract any other details other than it mostly likely won't be out until late this year.

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04-29-2004 01:01 AM  13 years agoPost 4
JWBurns

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The Lone Star State, Dallas Texas

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I was worried about the ring, I broke the old one getting it off.

What is the proper way in putting the ring on aside from making sure the ring meets at the nipple on the piston?

Jason

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04-29-2004 01:23 AM  13 years agoPost 5
Lee O'Dell

rrApprentice

Gibsonville, North Carolina

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http://runryder.com/helicopter/t405...ght=piston+ring

There is a small pin in the piston ring groove that is easy to miss. The ring space needs to be centered around it. Keep in mind that it WILL go on without doing this, but it will break the ring.

I put the connecting rod on the crank first then carefully slid the jug
( sleeve ) over the piston carefully aligning it. Do this without turning the sleeve once the piston is inside the sleeve. Then just push the piston and sleeve down until it seats on the crankcase. The idea is not to allow the ring space to get stuck in one of the port holes of the sleeve.

hope this helps ( and makes sense ?)

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04-29-2004 02:25 AM  13 years agoPost 6
Ben-T-Spindle

rrProfessor

Central Illinois

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I gave up on the OS50 and am now running two TT50 engines. These are much smoother than OS and so far have good durability and power. The thing I like the best is that the TT50 consumes much less fuel and about the same power. I just started running the new MP2 50 Q pipe. That made a big difference in the power and did not have much effect on fuel consumption.

I sure wish that OS would come out with a new 50!

... BTS

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04-29-2004 08:48 AM  13 years agoPost 7
G.Man

rrProfessor

Bristol

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Maybe the head wasnt tightened down in the correct sequence and you have warped the head?

Don't Email me as I wont reply - PM Only (spam countermeasures)

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04-30-2004 08:01 AM  13 years agoPost 8
Unbalanced

rrVeteran

Melbourne, Australia

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Bad luck - if you pull it out and run some oil around the mating surfaces you'll get to see where the leak is from. The ring won't cause the head to leak - if anything the leaking could indicate that you've got reasonable compression. Although it should at least fire. There is a thin shim (unless you've removed it) - maybe its been damaged ?

Twisting the liner can cause the ends to move past the locating pin and snappo. Its ok so long as the ring isn't over any ports.

This isn't really an OS prob - they can all bite you with bearings and these type of assemb issues.

Jeff

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HelicopterEngines Plugs Mufflers Fuel › OS 50 - The never ending story...
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