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the manual shows for a 100 :1 mix the ratio is 4 ounces of oil to 3 gallons of fuel
there are two engines and one is 50: 1 ratio so that would be 8 ounces of oil to 3 gallons of fuel
there is a pdf version workshop manual at www.motoren.ath.cx and it gives the ratios for all of the 4hp suzuki outboards and the oil to use
Don't know what unit you are dealing with, but stuck in my memory is the way the old Merc used to work.
There was a rod that rotated, and the shift mechanism slid into a slot. We only tilted removed the bottom end with the shifter in the forward position.
You may need to drop the bottom end to allow the shifter to be placed in the correct position.
I'm hoping that you are using the term "frozen" to describe "blocked", as another total PITA can happen when portions of the assembly become corroded. Loosening them up requires tha delicate balance of heat, penetrating oil, and brute force. Bearing in mind you don't want to set it on fire or break it.
I'd try dropping the bottom end, engage it in forward, place the shifter in forward, and carefully slide the bottom end back on.
Hope this helps.
There should be two flat screws on the lower leg, remove the bottom one and then the top.have the motor fully down position to drain, when filling with new oil it has to be done from bottom to purge the air out, Gear box is full when foil comes out top screw, install top screw and then bottom, you'll lose a bit of oil when bottom is removed install . if not sure have a look on YouTube, it should help you out.
inboard or outboard motor ??
unbolt the steering cable from the steering point of the engine or leg unit , then try turning the wheel and if it moves then try moving the engine or leg unit and see if it moves !?
Mariner 4hp are identical to Yamaha engines.
You should find a sticker on the port bracket with serial and model number.
If that sticker has disappeard, an aluminum piece is stamped in the side of the cilinder. The numbervstamped in that round pieceis the serial number. I can convert that serial number in a year/model number...
The water pump is a flexible impellor located in the top of the bottom section of the leg of the outboard. It is driven by the drive shaft to the prop that is spinning all the time the motor is running. You will find it behind or near the water inlet slots at the bottom of the leg
most 2 stroke motors will not burn all the oil in the mix and that unburned oil coats the exhaust leg and leaks out the thru hub exhaust and parting line of the lower to the housing. so keep some windex handy and clean it up.
These I think you will find were made in Yugoslavia by the Tomos company and sold under the "sea Bee " brand in the UK for some reason. I may be stating the obvious here but usually outboard gearboxes have 2 plugs one top and one bottom. Take out both to drain the oil and then fill from the bottom hole forcing in the oil till it comes out of the top hole, then refit the top plug followed byt the bottom one.
the proper mix is 50 to 1 or 16 oz to every 6 gallons,in my little boat I put 4 quarts in the 48 gal tank and its been running for 22 years,your running way to rich and your plug is probaly fouled,take it out clean it up/dump your fuel and mix it right,thats a great motor you got,I hunted with it for years,oh yeah when you get started run it till all the smoke is gone or you will have carb problems ,if you dont have them all ready,a little carb cleaner wont hurt but get it running first,or all that trash will foul you out,have a great trip bartriley1