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joecass2 · 07-05-2014, 11:02 PM

the piston pin has been fixed with the new piston.

the retains still come out even with the new part number. if OS can fix that this motor would be a good motor.

breakout · 07-06-2014, 03:19 AM

That's my experience, too. No probems any more with a slipping piston ring since the new piston design.
So the only thing to be solved seems to be the piston pin retainers. Obviosly OS is aware of that issue 'cause they allready changed the retainers to another part number. But even the new retainers are still to sloppy in the piston groove. So they have to change that once more. I can't imagine that this is really such a big deal to change the retainers to a working design. Hopefully the use of the OS 91 clips is a temporary workaround for that issue.

I really hope that they solve that last issue 'cause it will be the first light weight gas engine for smaller helis that makes a lot of fun. I know the zenoah engines are proven design and powerfull but they are so huge and heavy....
So having a smaller alternative would be great.

regards Dennis

Sowa · 07-06-2014, 05:30 PM

Quote:

Originally Posted by Inverse

This has not just happened in one or two motors, it's happened to many.

I've been following this motor for over a year now. I haven't heard of this problem coming up in more than 3 engines at this point.

Besides me, who else has had a wrist pin retainer fall out on their gt15hz?

joecass2 · 07-06-2014, 09:32 PM

So when I get this engine back from OS should I pull it apart and put the OS 91 clips in it or should I just fly it?

do you guys add any ethanol killer to the gas that you run with the GT15HZ like star tron Enzyme fuel treatment?

Rudy · 07-06-2014, 09:35 PM

Quote:

Originally Posted by mitsudriver274

I've been following this motor for over a year now. I haven't heard of this problem coming up in more than 3 engines at this point.

Besides me, who else has had a wrist pin retainer fall out on their gt15hz?

Really, I have asked many time for some one that has gotten at least 5 gal for fuel through this engine. NOT one reply back. The best I have heard so far is almost 2 gals. However that took 2 rebuilds to get there.

Again I ask has ANYONE gotten 5 gal of fuel through one of these engines.

Sowa · 07-06-2014, 11:56 PM

Quote:

Originally Posted by joecass2

So when I get this engine back from OS should I pull it apart and put the OS 91 clips in it or should I just fly it?

do you guys add any ethanol killer to the gas that you run with the GT15HZ like star tron Enzyme fuel treatment?

I have been running ethanol free fuel.

Quote:

Originally Posted by Rudy

Really, I have asked many time for some one that has gotten at least 5 gal for fuel through this engine. NOT one reply back. The best I have heard so far is almost 2 gals. However that took 2 rebuilds to get there.

Again I ask has ANYONE gotten 5 gal of fuel through one of these engines.

It seems most people that ran this engine last year quit when the piston ring retainer fell out. My question was regarding the wrist pin retainer falling out. What seems to be a new problem, but only with a handful of us.

The issue with hearing feedback from just helifreak, is that not everyone who flies this engine is a member on this forum board.

joecass2 · 07-09-2014, 07:52 AM

So when I get this engine back from OS should I pull it apart and put the OS 91 clips in it or should I just fly it?

do you guys add any ethanol killer to the gas that you run with the GT15HZ like star tron Enzyme fuel treatment?

breakout · 07-09-2014, 09:19 AM

The installation of the OS 91 clips is just an idea of mine. I will try this when my new parts arrive here. Your decision if you do the same. I think it is worth a try.

I didn`put anything in the fuel but oil.

regards
Dennis

PS: They are really difficult to install! Removing is easy with a long small pair of pliers.

brw0513 · 07-09-2014, 05:43 PM

Not my photo, but maybe a useful idea:

Sowa · 07-09-2014, 08:53 PM

Quote:

Originally Posted by joecass2

So when I get this engine back from OS should I pull it apart and put the OS 91 clips in it or should I just fly it?

do you guys add any ethanol killer to the gas that you run with the GT15HZ like star tron Enzyme fuel treatment?

I would just fly it, as is. That way if it happens again you can still point the finger at OS.

joecass2 · 07-16-2014, 09:42 PM

OS is not going to warranty it. because I got it from a unauthorized GP dealer of OS Engines.

I got it from rcjapan.

they would give me a new one for 350

Sowa · 07-17-2014, 12:09 AM

I had my motor repaired under warranty by OS, and also recieved it through rcjapan.net they have great customer service. Did you contact the North American OS reps or rcjapan.net?

joecass2 · 07-17-2014, 06:29 AM

North American OS reps

Sowa · 07-17-2014, 07:08 PM

It has to go through rcjapan.net, they will contact OS japan for you.

joecass2 · 08-20-2014, 09:23 PM

Got my engine back have 16 flights on it. It's running really good but I noticed.a little fuel leak around were the fuel pressure regulator plate is. Should i be concerned about this? I really don't want to send it back to japan again.

Sowa · 08-21-2014, 12:46 PM

I can't say if it's an issue or not, but the carb on my 15HZ has zero leaks.

joecass2 · 08-21-2014, 01:30 PM

Ok thanks

It's leaking pretty good now. Can I get parts for that carb?

07-06-2014, 03:19 AM	#22 (permalink)
breakout Registered Users Join Date: Sep 2013	That's my experience, too. No probems any more with a slipping piston ring since the new piston design. So the only thing to be solved seems to be the piston pin retainers. Obviosly OS is aware of that issue 'cause they allready changed the retainers to another part number. But even the new retainers are still to sloppy in the piston groove. So they have to change that once more. I can't imagine that this is really such a big deal to change the retainers to a working design. Hopefully the use of the OS 91 clips is a temporary workaround for that issue. I really hope that they solve that last issue 'cause it will be the first light weight gas engine for smaller helis that makes a lot of fun. I know the zenoah engines are proven design and powerfull but they are so huge and heavy.... So having a smaller alternative would be great. regards Dennis __________________ SAB Kraken 580, Pyro 600, HOBBYWING Platinum Pro 100A, Brain2 Miniature Aircraft Interceptor 600, OS MAX GT15HZ 2, Brain2, Lynx OXY2, Micro Brain2 Bell 222 with T-Rex 600E chassis, V-Bar

07-09-2014, 09:19 AM	#28 (permalink)
breakout Registered Users Join Date: Sep 2013	The installation of the OS 91 clips is just an idea of mine. I will try this when my new parts arrive here. Your decision if you do the same. I think it is worth a try. I didn`put anything in the fuel but oil. regards Dennis PS: They are really difficult to install! Removing is easy with a long small pair of pliers. __________________ SAB Kraken 580, Pyro 600, HOBBYWING Platinum Pro 100A, Brain2 Miniature Aircraft Interceptor 600, OS MAX GT15HZ 2, Brain2, Lynx OXY2, Micro Brain2 Bell 222 with T-Rex 600E chassis, V-Bar

07-17-2014, 12:09 AM	#32 (permalink)
Sowa Registered Users Join Date: Jan 2010	I had my motor repaired under warranty by OS, and also recieved it through rcjapan.net they have great customer service. Did you contact the North American OS reps or rcjapan.net? __________________ XL Power 700v2 Nitro NME - OS 105HZR - Power Tune - Rail 716/106 - Brain2 HD

07-17-2014, 07:08 PM	#34 (permalink)
Sowa Registered Users Join Date: Jan 2010	It has to go through rcjapan.net, they will contact OS japan for you. __________________ XL Power 700v2 Nitro NME - OS 105HZR - Power Tune - Rail 716/106 - Brain2 HD

08-21-2014, 12:46 PM	#36 (permalink)
Sowa Registered Users Join Date: Jan 2010	I can't say if it's an issue or not, but the carb on my 15HZ has zero leaks. __________________ XL Power 700v2 Nitro NME - OS 105HZR - Power Tune - Rail 716/106 - Brain2 HD

07-05-2014, 11:02 PM	#21 (permalink)
joecass2 Registered Users Thread Starter Join Date: May 2006	the piston pin has been fixed with the new piston. the retains still come out even with the new part number. if OS can fix that this motor would be a good motor.

07-06-2014, 09:32 PM	#24 (permalink)
joecass2 Registered Users Thread Starter Join Date: May 2006	So when I get this engine back from OS should I pull it apart and put the OS 91 clips in it or should I just fly it? do you guys add any ethanol killer to the gas that you run with the GT15HZ like star tron Enzyme fuel treatment?

07-09-2014, 07:52 AM	#27 (permalink)
joecass2 Registered Users Thread Starter Join Date: May 2006	So when I get this engine back from OS should I pull it apart and put the OS 91 clips in it or should I just fly it? do you guys add any ethanol killer to the gas that you run with the GT15HZ like star tron Enzyme fuel treatment?

07-16-2014, 09:42 PM	#31 (permalink)
joecass2 Registered Users Thread Starter Join Date: May 2006	OS is not going to warranty it. because I got it from a unauthorized GP dealer of OS Engines. I got it from rcjapan. they would give me a new one for 350

07-17-2014, 06:29 AM	#33 (permalink)
joecass2 Registered Users Thread Starter Join Date: May 2006	North American OS reps

08-20-2014, 09:23 PM	#35 (permalink)
joecass2 Registered Users Thread Starter Join Date: May 2006	Got my engine back have 16 flights on it. It's running really good but I noticed.a little fuel leak around were the fuel pressure regulator plate is. Should i be concerned about this? I really don't want to send it back to japan again.

08-21-2014, 01:30 PM	#37 (permalink)
joecass2 Registered Users Thread Starter Join Date: May 2006	Ok thanks It's leaking pretty good now. Can I get parts for that carb?

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