Note: a 'L' after the first letter s or end of the serial number sequence denotes a long shaft model. Serial Numbers to From on a letter code, production number and ending letter s and number code were used in the serial number to denote the model, production number and month and year of manufacture. Serial Numbers - Letter Definitions Some of the letters in the engine lettering code stand for different parts of the particular models. Model 40, Little Model 40 [ brochure ].
Model 40, Super 40 Plus [ brochure ]. SEFPC [ pics ]. Model 55 Seagull 3 [ brochure ]. Century Century , Century Plus. There is also some other information on Seagulls in that page. Click on the following for a link to the O-rings I currently use:. You need four O-rings for the repair. The above link leads to a reputable and with reasonable prices source of these O-rings for the fuel valve repair:. Check the preceding link to determine the correct grade of crankcase oil not grease for your Seagull.
The recommended oil in the gear case for some engines: SAE gear oil for regular use, SAE 90 gear oil for cold weather, and even engine oil under freezing conditions, but never grease; change the gear case oil every 15 hours of running time. SAE is what trucks use in their differential. Available at an auto parts store or where truck parts are sold. Some automotive stores can possibly have it or order it for you. You will note that this crankcase oil mixes with the water as the gear case is not totally sealed.
This is normal. That is why the oil changes color, and the reason for the need to change it every 15 hours of use. If the oil mixture has thickened so much, possibly due to extended storage, then perhaps some engine degreaser or grease solvent could do the job, but I do not know it that would do more harm than good.
I would prefer to just use fresh gear oil, of the recommended type, spin the engine so it warms up, and then pour the mixture out.
Repeat the operation as necessary. Which would make sense. However what happened to ? Lumped in with maybe? No one will tell me, no one seems to know. I will create a special page just for the Marstons and transfer all the info on them to it.
As far as we can gather, from the motors surviving, not many were indeed made, maybe as few as 1, I was right not to doubt the British Seagull info!
The years codes start with the first motor of whatever sort, that was made. Somehow the following table became very confused. Ian has given me a template here in which to hang the numbers, but sadly mine were all muddled, I have redone this table several times. Hopefully it is now correct. Whichever motor type was the first out of the factory in any year, is the code seen as the start number and code for the year.
The numbers just keep on adding up as the years go by, till they were getting unwieldy, thus the introduction of the date system in Recently research by others has revealed all sorts of anomalies that I had wondered about. Seems British Seagulls made quite a lot of other motors that did not appear in the official lists. We are slowly getting more info on them, but of course it is conflicting The Model carried on in production till at least, I have proof that they were making 'one off batches' into the 's, with electronic ignitions!
Sealed box British Seagulls can be recognised by an extra screw in the gear box casing just above the top gearbox cap screw. This screw secures the bearing assembly. Below is a table featuring the Forty and Century models, with hp, approx and type of gearbox oil. Give away for the sealed gearboxes is an extra screw just above the cap screws, this secures the bevel bearing and seal.
There has been much argument about power output, these figures are as close to the claimed truth as I can make them! The real truth is the power heads produced a lot less, but the gearing gave the thrust equivalent to motors of the claimed power!
See the note about the Trade's Description Act! In the very early years there were motors running on , and even , as has been found on tank decals of these old motors. These are the 'oddballs' though, the vast majority of the 3 million motors made ran on mix. The following should be considered when determining the right fuel mixture ratio for your engine: information reproduced from a service manual No.
Grade of Oil to be used. Only use two stroke oil for outboards. It must be for outboards, not lawn mowers or chainsaw, motor bikes or snow cats! Use TCW 2 or 3 grade. This is important as the oil is designed to lubricate at the low temperatures that British Seagull run at.. Motors manufactured from to January can satisfactorily use this ratio, providing the following modifications can be made. Prior to a shorter bearing was used in the crankcase and it is unsuitable for too lean an oil mix.
See FAQ page! The Amal 2 jet needs the main jet changing to a No. The Villiers needs a replacement needle, No. August 06, I have needles in stock again!! Please note, SOS has closed down for about 3 months, john is off on a long sailing trip, see the link to his log on the home page.
Back in August Telephone: E-mail: info britishseagull. John may be available to answer technical queries only, depending on cell phone coverage on his trip. Please do not expect me to post spares from the boat whilst sailing off Scotland though! The use of the letter 'W' in the dating codes. Below is the updated list. John Model Identification - Letter Definitions Some of the letters in the engine lettering code stand for different parts of the particular models.
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