Howdy, John here, I have a 40hp 1995 Johnson, of the 4 screws, two are screws and two are plugs, the top one is the vent and the bottom one is drain and fill. Oil is forced in from the bottom and out the top to prevent air pockets.
After filling, install the top plug first, then remove the filling device and install the plug.
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sounds like you need a new water pump impeller.
to access the impeller the bottom of the motor needs to be unbolted and the impeller is fitted to the shaft, it is keyed so it only goes on one way. ( impeller kits will come with new gaskets,grease.O-rings and a new key ). re-bolt the lower unit and test.
You need about 3 liters of Mobil 0w40 synthetic oil. New oil filter. There is a plug on the belly pan of the sled. Pull that off. Then there is a oil drain plug on the oil pan of the sled(look through the hole in the belly pan) Pull the oil plug and drain old oil. If you have a turbo, take off the intercooler tube, and then put rags or papertowel below where the oil filter sits. Spin off the oil filter (this might be real hard and some have resorted to driving a screwdriver through the filter to get it off) After all has drained.. Put in oil pan plug. Put in belly pan plug. Spin on new filter, put a little oil on gasket first. Replace intercooler tube. Then refil from the top of the motor with 2.5L of oil. Checking dipstick as you fill. Then start motor for a second or two, to fill filter. Top off the oil and recheck the dipstick until it reaches the full line. It really is very easy and after you do it once, you will be an expert at it.
HELLO; Yes you will need a filter located lower left side behind the peg ,you'll see a cover thats about an inch and a half wide with three allen head bolts, pull out the filter and when you replace it make sure the hole is towards the engine. Now about oil there are several ideas on this so heres my ( 2 cents ) I repair quads and have for several years,you have a quad that has a wet clutch if it is an older one and semi automatic so you don't want to use syn. oil as this will wear out your clutch sooner, I would recomend, yamalube,it will cost up to $5.00 a qt. but you only need two and a quarter qts. to fill your quad. GOOD LUCK, and remember you must be fast, because I was haulin *** when I passed you!
sounds like your mix is off and it's fowling the plugs. probably too rich. make sure the level in your carb bowls isn't too high. Really sounds like you should clean and bench set your carbs. Especially if a plug change helps but doesn't last, then it's got to be your fuel mix, or maybe timing.
Not familiar with that specific motor but had similar vintage smaller HP Johnsons. From my experience it sounds like it could be that the high speed carb adjustment is too lean. What I would try is running the backing off the high speed screw 1/4 turn to 3/4 turn, then test. If works better, screw back in in 1/8 turn increments until the problem recurs, then back out 1/4 turn and leave it there.