Any outboard 2 cycle after 1965 will run on 50:1 approx 500ml or half a quart per 5 gallon tank.
50:1 - Mix 100ml of oil per 5ltrs of fuel
SOURCE: Free wiring diagram for 1978 Mercury Outboard 115 HP boat motor
I have a maintainance manual for this engine (I have the same one) with pages of wiring diagrams. What specific system/area are you interested in, I could scan in the page(s) and email them to you.
Mark
SOURCE: Missing operators manual for Evinrude 2 hp outboard motor
Your best bet is ebay for a replacement user manual. Take a look around, you will come across one... For the meantime, gas oil ratio should be 50 parts gas to 1 part oil, i.e. 50:1. General care: Dont go full throttle for any length of time. Cruise of 3/4 throttle... Always flush engine after use in saltwater, including washing down exterior. Keep spark plugs in good order and check prop for fishing line wrapped around in near the prop hub. Otherwise, get a yearly service and have them check the water pump and replace as needed, get it tuned etc and gearbox oil changed.
SOURCE: My outboard mercury has been sitting several years
your engine is fuel injected the fuel system is clogged with bad gas. fuel is proven to only stay stable for 60 days. after that it begins to turn to varnish. I can lead you through the repair easily, but i do suggest you go to this website to get picture diagrams so you can see how the engine parts are lined up. www.mercruiserparts.com. upper right had corner of page click search with pictures. select product line. select column Mercury, force, mariner and other outboard select mercury mariner scroll down to V-150XR1 next page. verifiy the serial number then click on it. ok now you have a list of picture, discription and part numbers to view. TOOLS (1) A compression gauge (2) a spark gap tester.(3) A Clymer service manual for your engine. (you can purchase from your local dealer. I know all these are expensive but if your going to be a outboard owner you will always need them. TROUBLESHOOTING (1) check compression. I'm giving you a average numbers. Look at your Clymer manual for more specific numbers. all cylinders need to be over 100 lbs and equal each other within 5 lbs. If you have good compression (2) check spark. use a spark gap tester, all cylinders should jump a half inch gap.replace spark plugs, I know spark plugs probably don't look bad but this is a outboard. Fresh spark plugs means less resistance for the ignition system. The ignition system is week compared to automotive.(3) Replace all fuel filters. there may be one on the boat. there is a fuel filter under engine cover on the starbord side replace it. Test drive boat. I know it is time consuming but I am making sure you don't spend time and money when you dont need to. If problem is still there (4) the fuel filter you replaced under the engine cover follow the fuel line to the vapor seperator.(website fuel managment system breakdown reference numbers 21-25) (5)on the bottom of the seperator is a hose leading from the fuel seperator to the electric fuel pump. NOTE, what i want you to do is verify fuel is getting to the vapor seperator and to the electric fuel pump. because there is a needle and seat in the vapor seperator and a filter in the hose that stops up. NOTE the filter in the hose (reference number 48 on website)make sure you remove hose completely and check by blowing threw it(6)with hose removed use primmer bulb and force fuel into the engine. fuel should pour through fitting that the hose was connected to. If not we have more work to do. I'm hoping you filter is stopped up in the hose. IF THERE IS FUEL FLOW AND FILTER STOPPED UP put everything back together with new filter and test. if no improvement you have pressure test to follow in you clymer manuel. follow each step about fuel pressure test. you are testing the electric fuel pump a $600.00 unit. IF NO FUEL FLOW FROM FITTING and hose filter replaced( why put the old one back?) (7) You fuel vapor seperator needle and seat is stopped up. refer to websit pictures. reference numbers 23 and 24.(8) there is six screws to remove the top of the seperator. a o-ring that can be saved but i would suggest ordering a new one.WARNING float level is setting is critical be careful not to bend float or rod(9) Remove float and needle and clean seat thoughly with carb cleaner. use primer bulb and pump fuel. Does fuel flow? if yes replace needle and float and use primer bulb again. gently close needle by pushing on the float. you should be able to stop and start the fuel flow with the float and needle. if you have any worries order new parts.(10) after you have verified fuel flows and stops through needle and seat. look inside of seperator housing is there any sedement or varnish. IF CLEAN reasemble vapor seperator. IF DIRTY the vapor seperator also receive oil from oil pump at the bottom of the seperator look for hose and fitting. make sure oil fitting is clean if ANY DOUGHT ABOUT OIL DELIVERY REPLACE VAPOR SEPERATOR YOU CANNOT GET THE OIL VALVE SEPERATE IT COMES IN A KIT. ok I have taken you through the basics everything else is in the Clymer manual you need to purchase. good luck
SOURCE: suzuki outboard motor 65 hp --oil sensor keeps
assuming you are not out of oil in your oil reservoir you probably have a bad sending unit in the reservoir. never bypass it or eliminate it as you could permanently damage your motor or ruin it if you ran it out of oil.
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