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  #31  
Old 06-29-2012, 03:19 PM
NASA515 NASA515 is offline
 
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Location: Hansville, Washington
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Geez, down to just a core due to a clutch failure (2x in 800 hrs) with 80% mogas and 25 hour oil changes. Geez.....

Bob Bogash
N737G
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  #32  
Old 06-29-2012, 03:42 PM
fly3g fly3g is offline
 
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Location: Colorado
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[quote=rvbuilder2002;674603]
Quote:
Originally Posted by fly3g View Post

I think you are talking about a different sprague clutch . There is one in the main PSRU gear box and there is a small one just for the starter motor.
Yes, sorry his was the starter motor sprague clutch not the PSRU. Maybe his is still a unique case then.
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  #33  
Old 06-29-2012, 04:52 PM
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JerryG150 JerryG150 is offline
 
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Location: Bradenton, Florida
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Default octane ...

I located a gas station that sells non ethanol gas for "recreational vehicles" that is a bit more expensive but has only 90 octane.The Rotax site says 91 octane minimum should be used. Is one AKI and the other RON ... I'm confused.
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  #34  
Old 06-29-2012, 07:12 PM
dick seiders dick seiders is offline
 
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Jerry , go back to page one of this thread for more information.
Dick Seiders
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  #35  
Old 06-30-2012, 07:32 AM
dick seiders dick seiders is offline
 
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Sorry all, I am wrong about 500 hr carb oh . It's 200 hrs
Dick Seiders
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  #36  
Old 06-30-2012, 09:28 AM
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rvbuilder2002 rvbuilder2002 is offline
 
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Quote:
Originally Posted by dick seiders View Post
Sorry all, I am wrong about 500 hr carb oh . It's 200 hrs
Dick Seiders
Dick,
I wasn't going to correct you because I don't have access to documentation at home, and couldn't remember if there was a 500 hr overhaul.

But I do know that the 200 hr interval isn't a requirement for an overhaul.
It is a very thorough inspection though, but only requires replacement of parts "on condition".
The full blown overhaul kit retails for about $500, but it shouldn't be needed until the engine has a lot of time and years on it. I think Rotax recommends that you need a service parts kit (about $150) to do the carb. inspection. With care, you can disassemble and reassemble the carbs. without it (many Rotax techs do so).

My experience has shown that the highest wear item in the carbs is the float arms, as a result of the float pins rubbing on them because of engine vibration. Fortunately the are not super expensive.
I believe a dynamic prop balance goes a long way towards minimizing this wear.
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  #37  
Old 06-30-2012, 10:52 PM
RGaines RGaines is offline
 
Join Date: Aug 2007
Location: Novato, CA
Posts: 151
Default Prop Balancing

I have been wondering about dynamic prop balancing. With the geared engine and the prop turning at different speeds in seems that the relative position of the engine parts and the prop would be constantly changing. Does the dynamic balancing still work? Are different systems available to do the balancing and which works best? Thanks for mentioning this, Scott.

Richard
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  #38  
Old 07-01-2012, 08:34 PM
dick seiders dick seiders is offline
 
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Scott, you are correct in that the carbs are required to be torn down and checked at 200 hrs - not overhauled. Don't know yet if that occurs each 200 hrs, or just at 200 and 600. Manual doesn't help much here. I also cannot find an overhaul event on the schedule. So I have asked a Tech. Instructor at the FL. Rotax Training School to clarify. Will report back on response from them.
Dick Seiders
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  #39  
Old 07-02-2012, 07:29 AM
BigJohn BigJohn is offline
 
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Location: Gloversville, NY
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Richard,

Prop balancing made a huge difference in vibration level. Stick doesn't shake anymore! I don't remember the brand of the equipment that was used - I could find out if necessary.

John
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  #40  
Old 07-02-2012, 06:12 PM
dick seiders dick seiders is offline
 
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Ok, got the word from Rotax Tech. at Lockwood on the carbs. Here it is:

The manual stipulates a "Disassembly Inspection" every 200 hours. That has
mostly to do with cleanliness and vibration issues. There is no "overhaul"
required except for when overhaul of the engine takes place or as needed by
other circumstances. If a carburetor has been abused or neglected in some
way, or is showing severe enough performance issues, that's when an overhaul would be wise.

So every 200 hrs insp. with necessary repairs only. No overhaul is scheduled, but if necessary do it.
Now if we could just get UL91.
I will still provide feedback when I get more from Madison on the 90 Rec. Fuel.
Dick Seiders
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