thanks for that reply Mercman
been a week or two now . sorry
ive done this and that done some more research
yep its a frankenstien ....so its just guess work
it could have a 50 hp powerhead on it ..so putting plugs for a 65 say l17v may not be right as the 70s model runs a l77v plug
the timming for a 1969 650 is different from a 1972 model
mine seems to be made up of parts from 67 - 73 so its trickyim across the road from the guy i bought it off . he said it had rings and a new top where the plugs go in done about 4-6 years ago buy someone out of town
hence why its got good compression
as i said ..it starts idols revs but only to 2 2000 rpm underload.after injecting copious amounts of carbie cleaner down carb 2 my forth plug seems to be getting fuel oil .as is wetter than before and i used a different plug so i think we are on all 4 cyliners.
so this brings me to the prop . i have the original as a spare buts its stuffed ,has the numbers on it mercury original 13and ? x 15 pitch
found tables with prop sizes and pitches for 65 hp from that era
i cant tell what ive got on as i cant find any id numbers ..
i should have a 13 .5 x 15 lets say .. different prop pitch and size for d``ifferent revs of the same engine
it says that a 13 will rev to 4800-5200- but a 14 with some ?inch pitch ..which is designed to push a houseboat will rev to 2800 but have heaps of push
so maybe ive got a bloody houseboat prop and nothing is wrong with my unit!
so i stopped at a mercury parts shop and enquired about buy a correct prop for $200-300 willing to give it a crack
and the guy says "reckon your wasting your money .youve got other issues and didnt even offer me a prop ...
so i have finally decided to give it away . i give in . i cant afford to buy anew 60 at 8 grand ,but i dont want to buy somebody elses second hand 20 year old piece of
that they want half the original price for out of gumtree or ebay ..ive learnt my lesson
just because it starts and runs doesnt mean its a good outboard
a friend of a friend ended up being a mercury outboard expert . he loaned me the flywheel remover and a compression tester small enough to get to no 4 plug
comp is good all 4 around 120 psi and even
anyway stuck with a no go boat ..thinking of giving back to the guy i bought it off ($1000.00) and and telling him to keep his money and have his boat as im over it luckely it was more time than money spent