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 Catalina/Capri 25/250 Sailor's Forums
 General Sailing Forum
 Evinrude 9.9 octane rating		  New Topic  Topic Locked
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jerry
Deckhand

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USA
3 Posts
Initially Posted - 05/14/2002 :  21:01:48  Show Profile
Can I use premium gasoline to my Evinrude9.9 ('85 ) 2 cycle engine.
If I use a higher octane rating, will the engine have more power and will it not hurt my engine ?
Jerry C.FK #5025
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dlucier
Master Marine Consultant

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Virgin Islands (United Kingdom)
7583 Posts
Response Posted - 05/14/2002 :  21:38:29  Show Profile
I use a midgrade gasoline in my outboard engines.

I found this at the Mastertech website;

<b>"What Octane gasoline should I use for my outboard?
I have an older outboard with higher compression. Should I burn PREMIUM gas?"</b>

NO! here's why. The octane ratings are composed of 2 components, research octane and motor octane (RXM/2) divided by 2. The RESEARCH octane is the quality of the base stock, the MOTOR octane is derived from additives. The oil company will never tell you the ratios. Problem is the highest octanes are achieved by MOTOR octane additives, which will just gum up the pistons in a 2 cycle engine. Base stock is generally the same. The MID-GRADE gas has the detergent additives needed to clean your motor and sufficient octane for MOST motors. If you have a MERCURY, FORCE or OMC motor from the early 70's thru mid-80's refer to technical bulletins from the manufacturers for timing changes and replacement head gaskets to lower compression to use todays gasolines.


For more gas info, go to

http://www.maxrules.com/fixgas.html

Don Lucier, Northstar
C25 SR/FK
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Notice: The advice given on this site is based upon individual or quoted experience, yours may differ.
The Officers, Staff and members of this site only provide information based upon the concept that anyone utilizing this information does so at their own risk and holds harmless all contributors to this site.