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Rotax engine - Number of hours on engine before overhaul

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John H Murphy

Joined: 03 Jan 2007
Posts: 78
Location: Henderson, NV

Posted: Thu Feb 22, 2007 7:54 am Post subject: Rotax engine - Number of hours on engine before overhaul

My Kolb Firestar has 180 hours on the engine. Everything seems to be running fine. I have full instruments and have never noticed any deviation from normal temp. I've been told that I should have the engine sent back to CPS for a 150 hour inspection. Is this recommended? What are most of you pilots doing? Thanks.

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jindoguy(at)gmail.com
Guest

Posted: Thu Feb 22, 2007 8:19 am Post subject: Rotax engine - Number of hours on engine before overhaul

John, First take the exhaust manifold off and take a look at the cylinders and pistons. If there's no evidence of seizure or excessive carbon buildup, fly on. This will only cost a couple of bucks for new gaskets. This will tell you everything you need to know without doing a teardown and splitting the cases. 



Rick



On 2/22/07, John H Murphy <jhm9812(at)yahoo.com (jhm9812(at)yahoo.com)> wrote: 	  Quote: 	
		   --> Kolb-List message posted by: "John H Murphy" <jhm9812(at)yahoo.com (jhm9812(at)yahoo.com)>



My Kolb Firestar has 180 hours on the engine. Everything seems to be running fine. I have full instruments and have never noticed any deviation from normal temp. I've been told that I should have the engine sent back to CPS for a 150 hour inspection. Is this recommended? What are most of you pilots doing? Thanks. 



	


-- 

Rick Girard

"Ya'll drop on in"

takes on a whole new meaning

when you live at the airport.  [quote][b]

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John Jung

Joined: 10 Jan 2006
Posts: 108
Location: Surprise, AZ, USA

Posted: Thu Feb 22, 2007 9:34 am Post subject: Re: Rotax engine - Number of hours on engine before overhaul

Have the engine never been decarboned? 



Rotax recommends that it be inspected every 50 hours and decarboned as needed. I decarbon mine at 100 hours and I have never been able to detect a ring that is stuck on the end by checking it through the exhaust port.  I have never failed to find a stuck oil ring after disassembling at 100 hours. My engines have always run good with stuck oil rings, I just don't want to push it too far. My last 100 hours was with Pennsoil Air cooled, injected, and even that didn't help.



Here is my best advise: If you do choose to not decarbon, at least stop flying when the engine gets difficult to start. I believe that is the engines last call for help, and the next thing it will do is quit on you. Just my opinion, after 18 years of flying Rotax two cycles.

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_________________
John Jung
Firestar II N6163J
Surprise, AZ

olendorf

Joined: 06 Jul 2006
Posts: 140
Location: Schenectady, NY USA

Posted: Thu Feb 22, 2007 11:13 am Post subject: Re: Rotax engine - Number of hours on engine before overhaul

I had 147 hours on the 447 and it had a good amount of carbon. I'm glad I decided to decarbon it. The rings were free and It would have been OK for a while longer.  I run Pennsoil for air cooled engines at 50:1 premix.



After I had decarboned it I noticed some oil dripping from the front of the engine and I had to remove the engine and replace the oil seals.  I did this at about 160 hours.



Here is how it looked before I did any decarboning.  Looking at the rings from the exhaust port always looks good.  If it looks bad then it is probably really, really, bad.

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Scott Olendorf
Original Firestar, Rotax 447, Powerfin prop
Schenectady, NY
http://sites.google.com/site/kolbfirestar/

Roger Lee

Joined: 10 Jan 2006
Posts: 1464
Location: Tucson, Az.

Posted: Thu Feb 22, 2007 5:18 pm Post subject: Re: Rotax engine - Number of hours on engine before overhaul

Hi Guys,



Aren't Rotax air cooled 2 strokes supposed to be overhauled at 300 hrs.?

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_________________
Roger Lee
Tucson, Az.
Rotax Instructor & Rotax IRC
Light Sport Repairman
Home 520-574-1080 TRY HOME FIRST
Cell 520-349-7056

ElleryWeld(at)aol.com
Guest

Posted: Thu Feb 22, 2007 5:24 pm Post subject: Rotax engine - Number of hours on engine before overhaul

You don't have to believe everything you read is what most of us have been proving anyway

 If I was selling Rotax parts I would tell you the same  

 

  Ellery

  do not archive

**************************************

 AOL now offers free email to everyone.  Find out more about what's free from AOL at http://www.aol.com.  [quote][b]

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John H Murphy

Joined: 03 Jan 2007
Posts: 78
Location: Henderson, NV

Posted: Thu Feb 22, 2007 9:39 pm Post subject: Re: Rotax engine - Number of hours on engine before overhaul

I should have mentioned that I have a Rotax 503, with Dual carb & ignition.

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