Older outboard motors usually take 50 to 1 mix ratio where as the newer ones often take 100 to 1 mix ratio.Try Google to double check.
SOURCE: 1996 Mercury 150 Nitro EFI
Dont have the manual in front of me...recollect that there's two types of warnings. The pulsating warning is oil (starts with 30 minutes of oil left) or the fuel filter (or sperator, something like that) may have water in it. Running outboard with cover off, is a little black box that would have a red light lit if that's the case. If oil full & no red light, may be oil injection system...would also check to make sure lines aren't pinched, etc. Mine has been specific to oil the two times its gone off.
The full non-pulsating is engine overheat. Not sure beyond that.
Not much, but hopefully gets you going.
SOURCE: impeller replacing on 1999 merc. 25hp 2 stroke
Should not be that hard. Tape up the ends so you can hold it with out getting cut, (if its ragged or sharp from damage). should be one nut holding the impeller on. If its to tight to hold try air or electric Impact wrench. If its bad you can tap with a hammer to help in removing the old one. If it turned on the shaft you will need to rent a puller. Repost if you need more help.
SOURCE: mixing of two stroke engine
I use 8 oz's.of oil to 3 gallons of gas in mine with good results
SOURCE: I have a 15 hp 2 stroke mercury outboard. When I
it is getting flooded ,dont ask me why, as im not there to check it out but if when first prmeing you stop pressing the bulb as soon as you feel any pressure at all, you will probably find it will start up straight away
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