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Cuyuna oil, was: Re: Rotax 503 running problem

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Dana

Joined: 13 Dec 2007
Posts: 1047
Location: Connecticut, USA

Posted: Tue Jun 23, 2009 9:13 am Post subject: Cuyuna oil, was: Re: Rotax 503 running problem

At 07:38 PM 6/19/2009, Ron  (at)  KFHU wrote:



 	  Quote: 	
		  ...The advice I am getting here is to remain on 40/1 mixture that Cayuna 

recommended.



I guess I'll stick with that. Is there anything none exotic that I can get 

at Walmart that will do the job, or do I need to get some special oil. I 

think I read in the past that Pennzoil something or other is the 

recommended oil, is that so?


	


Ron, I'm using the "Pennzoil Air-Cooled 2-cycle oil" in my Cuyuna at the 

recommended 40:1 ratio, as did the previous owner.  Some people say "use 

50:1, the oils are better today" but I'll stick with the factory 

recommendation.  Change oil ratio and you need to change jetting, too... 

and the factory recommended jetting works, too.



Advance Auto Parts sells the Pennzoil but I usually buy it by the case from 

<http://www.oil-store.com/>.



-Dana

--

  Society is like a stew. If you don't keep it stirred up, you get a lot of 

scum on top.

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dalewhelan

Joined: 11 Nov 2008
Posts: 105
Location: USA ARIZONA fountain hills

Posted: Tue Jun 23, 2009 6:00 pm Post subject: Re: Cuyuna oil, was: Re: Rotax 503 running problem

I hope I don't tick anybody off with this.

While it is true that adding oil leans the fuel mixture, and some have even tried to change their jetting by altering fuel ratio. Changing from no oil premixed to 20:1 changed the amount of fuel delivered by 5%

Changing from 50 to 20:1 changes your fuel by 3%

I am not sure how many ccs/ min a Bing jet like 158 flows, if you had your jetting perfect to start with I would guess these oil changes would result in a change of about 1 size.

I normally only jet to the closest main when I really want something to run, Some people I know would get a half size by changing their coolant temp 5degrees C Hotter=Richer

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_________________
Dale Whelan
503 powered Firestar II, Luscombe 8A
Projection, A simple and interesting Psychological concept

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