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British Seagull Technical

British Seagull Technical

PLEASE NOTE WE DO NOT COVER LITTLE FORTY MODELS AS PARTS ARE NOT AVAILABLE

SIZES AND TOLERANCES FOR BRITISH SEAGULLS

CYLINDER 102CC                                             2.237"/2.238"
                     64CC                                             1.770"/1.771"

PISTON   102CC                                                2.2335"/2.2345"
                   64CC                                               1.768"/1.769"

CRANKSHAFT                                                   0.6225"/0.623"

MAIN AND BIG END BEARING                          0.6245"/0.625"

SMALL END 102CC                                           0.500"/0.502"
                       64CC                                           0.438"/0.439"

GUDGEON PIN 102CC                                     0.4994"/0.4998"
                             64CC                                     0.437"/0.4375"

PINION BEARING                                              0.500"/0.501"

REAR END BEARING                                        0.500"/0.501"

END CAP BEARING                                           0.502"/0.503"

PINION                                                                0.4985"/0.499"

PROPELLER SHAFT                                          0.4985"/0.499"

 

TORQUE SETTINGS FOR BRITISH  SEAGULLS

5/16"       CYLINDER HEAD BOLTS ( ALWAYS USE NEW BOLTS!)  18FT/LBS

5/16"        CYLINDER BASE BOLTS                                                     18FT/LBS

1/4"          CYLINDER BASE NUTS                                                         9FT/LBS

1/4"          CRANKCASE BOLTS                                                              9FT/LBS

9/16"        DOME NUT FOR FLYWHEEL                                               24FT/LBS

                 BEVEL PINION DRIVE SLEEVE                                            20FT/LBS

Distance between bracket and water line:

 SJM=355 mm, SJP=410-425 mm, SJPL=555-565 mm, LLS=410-425 mm, LLSL=555-565 mm, TC & THC=410-425 mm, TCL & THCL=555-565 mm.

 

Recommended gearbox oil:

 EP 90, gear oil for models: FS, EFS, FPC, EFPC, SC, ESC, EFNR, ENC, EN.

 

SAE 140, gearbox oil is unsuitable for:

 FS, EFS, 55, 75, 90, 125 and 170 models.

 Change gearbox oil at least every season. Check correct level often. It is normal for a small amount of water to enter the gearbox. This will not harm the gears or bearings.

Useful spares and tools:

Extra spark plug, propeller safety spring and split pin, starting cord, combination spanner and screwdriver.

Model identification.

The model identification is the first group of letters of the serial number on the crankcase.

This group may have the letter "L" on the end which denotes a long shaft engine.

Please see ID my engine for more detailed information

Engine mounting.

 The motor must be fitted upright (vertically) with the exhaust outlet only an inch or so below the surface of the water. Deeper immersion will affect both quick starting and performance.

 

Water pump and cooling system. 

 The Seagull water pump is valveless and seldom gives any trouble. When the water is circulating correctly it will be seen flowing from the outlet. The motor can be run at low speeds for a minute or so without the water flowing and then speeded up to circulate water.

25:1 (4%)  petrol/oil ratio.

All engines manufactured from January 1978 are designed to operate on a 25:1 petrol/oil ratio. Use low octane fresh commercial grade petrol and mineral outboard motor oil. The oil ratio must not be cut below this. Older engines can be converted to this ratio if some modifications are made.

Engine models before this date with either the Villiers or Amal carbs can still be converted to run on 25:1 fuel mix with the conversion kit supplied in our webshop.

If your engine is supplied with the bing carb this is able to run on 10:1 or 25:1 fuel mix without conversion.

10:1 mix - 5L unleaded fuel + 0.5L of 2 stroke oil 

25:1 mix - 5L unleaded fuel + 0.25L of 2 stroke oil 

THIS IS WHERE TO FIND OUT WHICH ENGINE AND SHAFT LENGTH IS THE ONE FOR YOU!

THIS PAGE IS THE MOST IMPORTANT WHEN LOOKING FOR A BRITISH SEAGULL FOR YOUR BOAT!!

IF AT ANYTIME YOUR NOT SURE - PLEASE JUST PICK UP THE PHONE OR MAIL ME AND WE WILL GIVE YOU CONFORMATION ON YOUR CHOICE OR SUGGEST A MORE SUITABLE ALTERNATIVE.




1.5 HP ENGINES.



FORTY MINUS, FORTY FEATHERWEIGHT, MODEL 45

3500 RPM
SINGLE CYLINDER 3 PORT 2 STROKE
WATER COOLED
GEAR RATIO 10/21
PROP - 4 BLADE 6" DIAMETER
WEIGHT 26LB OR 12KG
FUEL CONSUMPTION APPROX 6HRS/GALLON
4 PINT FUEL TANK
SERIAL NUMBERS
F
LM
SJM
GF
FS
GFS

FREEBOARD (DISTANCE FROM TOP OF STERN TO WATER LINE)
IDEAL FOR 6-9 FOOT DINGHIES WITH LOW TRANSOMS APPROX 14” FROM TOP OF TRANSOM TO WATER LINE

AVAILABLE IN JUST THE ONE LENGTH



3 HP ENGINES.



40MODEL,FORTY PLUS MODEL,

4000 RPM
SINGLE CYLINDER 3 PORT, 2 STROKE
WATER COOLED
GEAR RATIO - 10/35
PROP - 4 BLADE 9" DIAMETER
WEIGHT - 28LBS OR 13KG
FUEL CONSUMPTION  - 5 3/4 HRS PER GALLON
4 PINT FUEL TANK
SERIAL NUMBERS

SJP
FP
GFP
FPC
GFPC
EFPC

IDEAL FOR 8-12 FOOT DINGHIES OR AUXILLARY ENGINE FOR SMALL SAIL BOATS ETC
FREEBOARD (DISTANCE FROM TOP OF STERN TO WATER LINE)
STANDARD SHAFT -16 INCHES  LONGSHAFT - 22 INCHES


4HP ENGINES




CENTURY 100 AND CENTURY PLUS

4000 RPM
SINGLE CYLINDER, 3 PORT, 2 STROKE
GEAR RATIO - 10/35
PROP -  4 BLADE 9" DIAMETER - 5 BLADE WITH CLUTCH
FUEL CONSUMPTION - 3 1/4HRS/GALLON
4 PINT FUEL TANK
5.5 PINTS IF LONG RANGE TANK FITTED
TOTAL DRY WEIGHT - 37LB OR 17KG
SERIAL NUMBERS
LLS
CP
CPC
W
WP
WPC

IDEAL ENGINE AS AN AUXILLARY FOR BOATS 17-19 FOOT BOATS OR FOR LOCAL COASTAL USE ON SMALLER BOATS.
FREEBOARD (DISTANCE FROM TOP OF STERN TO WATER LINE)
SHORTSHAFT - 16 INCHES LONGSHAFT - 22 INCHES


5 HP ENGINES



SILVER CENTURY, SILVER CENTURY PLUS, 75,80,90 & 110
RPM - 4500 MAX
SINGLE CYLINDER 3 PORT 2 STROKE
GEAR RATIO - 12/48
PROP - 5 BLADE - 11" HYDRAFAN
FUEL CONSUMPTION - 2.5HRS/GALLON
FUEL TANK - 4 PINTS OR
5.5 PINTS FOR A LONG RANGE TANK
TOTAL DRY WEIGHT - 37LB OR 17KG

SERIAL NUMBERS
S
SP
SPC
WS
WSC
WSPC
ESC
ESPC
EFNR
SD110 - INBOARD ENGINE - (NO PARTS AVAILABLE SO UNLESS YOU OWN A MUSEUM DON’T BUY !!)

AS A MAIN ENGINE FOR 14-17 FOOT BOATS AND AS AN AUXILLARY FOR FULL BODIED BOATS, FISHING BOATS FROM 2 TO 5 TONS
FREEBOARD (DISTANCE FROM TOP OF STERN TO WATER LINE)
STANDARD SHAFT - 16 INCH
LONGSHAFT - 22 INCH



6-6.5HP ENGINES.



QB SERIES -  KINGFISHER - SEAGULL 6

5 PORT WATER COOLED 2 STROKE
102CC
GEAR RATIO - 3.1 TO 1 FNR (FORWARD NEUTRAL AND REVERSE)
FUEL TANK - 3.5L EXC REMOTE OPTION
FUEL CONSUMPTION - 1.7L/HR
TOTAL DRY WEIGHT - 55.5LB OR 24 3/4KG
FREEBOARD (DISTANCE FROM TOP OF STERN TO WATER LINE)

STANDARD SHAFT - 15 INCHES
LONGSHAFT - 20 INCHES

SERIAL NUMBERS
K
KL
KS
KSR
KLR
TKS
TKL


THESE MODELS ARE FAIRLY RARE TO GET HOLD OF AT THE MOMENT BUT I’M SURE IN YEARS TO COME THEY WILL BE SOLD OFF WHEN THEY ARE FOUND!

SD160 MODELS ARE INBOARD MODELS AND AS ALL SEAGULL INBOARD MODELS THE PARTS ARE NOT AVAILABLE AND SO WE CLASS THEM AS OBSOLETE


NOTES ON ENGINE CODES

ALL MODELS ENDING IN AN ‘L’ THESE ARE LONGSHAFT MODELS, BUT BE AWARE OVER THE YEARS MANY CRANKCASES HAVE BEEN REPLACED AND MAY NOT HAVE THE CORRECT ENGINE NUMBER STAMPED ON IT!!



IF AN ‘R’ IS AT THE END THIS IS A RECONDITIONED ENGINE OR IS FITTED WITH ROLLER BEARINGS OR IS TO BE USED WITH A REMOTE FUEL TANK

‘A’ DENOTES FITTED WITH AN AMAL CARBURETTOR

‘E’ DENOTES BEING FITTED WITH ELECTRONIC IGNITION

‘G’ DENOTES BEING FITTED WITH A BING CARBURETTOR

‘S’ DENOTES SILVER CENTURY SERIES OR HAVING A SEALED GEARBOX (SHORT SHAFT ON OB SERIES)

‘T’  DENOTES HAVING A TWIST GRIP THROTTLE CONTROL



SEAGULL SHAFT LENGTHS

PLEASE SEE ABOVE

THESE LENGTHS ARE FROM THE TOP OF THE TRANSOM TO WATERLINE!!



ENGINE WEIGHTS

All Weights are dry weights so no fuel or oil included

FEATHERWEIGHT        12KG

 

40+                                   13KG

 

102                                   16KG

 

    100 4HP                              17KG

 

5HP SIL CENT                17KG

 

ADD 2KG FOR LONG SHAFT MODELS
 

PLEASE CALL 01527 835027 or EMAIL for any help or advice
 

Copyright © 2012 Classic Seagull. All rights reserved

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Fuel Tap Screw (Brass Type)

£1.54

Fuel Tap Screw (Brass Type)

Product Code: 1307s

Brass Fuel Tap Locating Screw Screw located in the side of the fuel tap to secure fuel tap plunger on brass fuel … More info

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