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ContinuousWave Whaler Moderated Discussion Areas ContinuousWave: Whaler Repairs/Mods Determing the Horsepower and Gasoline:Oil Mixing Ratio for Older OMC Outboards From Model Number and Serial Number search | FAQ |profile | register | author help |
Author | Topic: Determing the Horsepower and Gasoline:Oil Mixing Ratio for Older OMC Outboards From Model Number and Serial Number |
rainbow | posted 05-28-2009 03:26 PM ET (US) Bought an old Johnson Electramatic, super sea horse. Serial#2239776,Model#RKL 24L. How can I determine the horsepower[?] What is the oil ratio to gas[?] Thanks. |
jimh | posted 05-28-2009 08:23 PM ET (US) The oil:gas ratio is not normally given. Generally the gas:oil ratio is given. A gas:oil ratio of 50:1 is generally recommended for most two-cycle motors. Very old motors may use a lower ratio. I do not know of any resource which provides a cross-index from the serial number of a motor or the model number of a motor to the recommended gas:oil ratio. Generally you have to rely on anecdotal reports from people with good memories or access to old catalogues. |
home Aside | posted 05-28-2009 10:05 PM ET (US) Try contacting an Evinrude / Johnson dealership that has been around for a while, try this link & ask the owner Dave, he's a friend of continuouswave and many of the Detroit area / Boston Whaler Great Lakes Cruising Club Members, he is a font of knowledge re: Evinrude / Johnson Motors...send him an e-mail..tell him Pat Henahan / Homeaside sent you.. they've been in business since 1918 good luck Pat |
R T M | posted 05-28-2009 11:12 PM ET (US) I think the oil and fuel ratio changed from 24:1 to 50:1 in 1966 for OMC I had a `66 3hp Johnson, and the decal on the tank said you could use either ratio, rich/Binkie |
Tom W Clark | posted 05-29-2009 12:30 AM ET (US) The 1962 johnson 40 HP outboard motor used a 24:1 gasoline/oil ratio. |
Tohsgib | posted 05-29-2009 11:23 AM ET (US) 24:1 if you use 1962 oil. If running modern TCW3 you can mix it 50:1. |
Mr T | posted 05-29-2009 01:54 PM ET (US) [Suggested that this discussion be moved to another website. I disagree. We are having a discussion here, and so far the originator has not even showed up for a follow up comment. To stop the discussion now seems pointless. It is underway here, so let's continue. When we hear from the originator that he is hopelessly disappointed with the results he got, then you can email him and tell him where he went wrong by posting here. Until then, I say, 'carry on.'--jimh] |
R T M | posted 05-29-2009 04:57 PM ET (US) Nick, I may be all wrong, but I thought the change in oil had more to do with the fact that the OMCs prior to 1966 were not using needle bearings, although I know Mercs used needle bearings back in the `50s. rich/Binkie |
rainbow | posted 05-30-2009 11:13 PM ET (US) Appreciate all the comments although some are conflicting. Buying a service manual from E-bay, found out the year and make of the outboard, will continue to research over the web. Thanks again. |
seahorse | posted 05-30-2009 11:49 PM ET (US) OMC used needle bearings in some of their engines going back to at least 1949. For many years various motors used a combination of brass bushings along with needle, ball or roller bearings, and those require a 24:1 ratio. The official factory changeover date from 24:1 to 50:1 fuel mix was for the 1964 model year motors. |
modenacart | posted 05-31-2009 06:21 PM ET (US) This is from the Evinrude website. 'Q - What is the fuel/oil mix for my motor? Go betweens discography rar downloads. 16 hit on the Billboard Modern Rock Tracks chart in the United States. The follow-up single 'Was There Anything I Could Do?' A - The following is generally true: 1958 and prior used 20:1, 1959 thru 1963 used 24:1, 1964 and newer use 50:1. High performance usage (racing) requires a ratio of 25:1. New engine break-in (not DI) requires 25:1.' The link to the information is http://www.evinrude.com/en-US/About.Us/FAQ/Oil.Fuel.htm?popup=true#Q2. |
jimh | posted 06-01-2009 11:04 PM ET (US) There is a collection of information in which an association between model numbers and year of production has been established. See: Evinrude 1930 to 1979 http://www.marineengine.com/parts/model_guide_pre80.html This may be useful in associating a particular model number to a particular year. |
- Outboard Motor Repair Manuals. You may also visit the Boat Motor Manuals section of our site to obtain a service. Montgomery Ward 'Sea King' 25-3605 (22DE10G.
- Apr 22, 2016 (I don’t think the ’64 Sea King had the motor decal) I guess with the decals, they didn’t think it needed to be included in the manual. A couple of the manuals I have a careful owner wrote in the mix on that last page. That’s one of the 11.97 CID motors which I always found to be a tad disappointing on performance.
Sea King Outboard Motor Manual
New Original Equipment tune-up kit consisting of two (2) sets of breaker points and two (2) condensors. This kit is applicable to many different years and models of outboard motors manufactured by Gale Products sold through these stores: Montgomery Wards, Goodyear, Spiegel, Gamble-Skogmo, Atlas and others under the names of Sea King, Buccaneer, Hiawatha, Sea Flyer, Brooklure, Royal, & Sea Bee.
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