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 on: February 07, 2019, 06:54:12 AM 
Started by antman - Last post by austral
Are you 100% sure you are getting full throttle ? The fact its been swapped and changed, it may not be adjusted right.

 on: February 04, 2019, 06:19:31 AM 
Started by antman - Last post by MERCMAN
Not only could the prop be a factor, you may have a gearbox with the incorrect ratio based on what ever powerhead you have.
Sent us a pic of the gearbox plus the midsection and shockers (if any). These pics will assist me in figuring out the possibilities.

This is a good quiz!


 on: February 03, 2019, 03:20:20 PM 
Started by antman - Last post by antman
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 Huh 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  Cheesy Cheesy Cheesy
lessons learnt 

 on: January 25, 2019, 06:58:01 AM 
Started by austral - Last post by austral
After checking, the badge is about 10" long.

 on: January 24, 2019, 06:26:04 PM 
Started by austral - Last post by austral
Hi all, chasing a chromed,die cast caribbean dash badge which is about 6" long . Need to replace my broken one on my favourite vintage boat.
Cheers,  Darryl.

 on: January 23, 2019, 02:05:40 PM 
Started by antman - Last post by MERCMAN
One of our members AaronJ had a collection of 4 (I recall) of short shaft 650's. Perhaps he may still own a goer which he is prepared to part with? Send him a PM.
If need be, I can email you his phone number.


 on: January 22, 2019, 01:37:00 PM 
Started by antman - Last post by antman
THanks Mercman
done that .....blue spark constant on plug lead 4
plug firing
sunny bayside  moorabbin
didnt get to water on weekend . will try asap
its not over till its over

 on: January 16, 2019, 04:15:37 PM 
Started by antman - Last post by MERCMAN
That is the incorrect sticker for a '67 model, if in fact that's what block you have??
That sticker belongs to a 73 model, which match your outer cowls. Grrr.
Where are you located? I think you have a Frankenmerc? I hate them.

As for number 4, I suspect spark, not fuel.
The bottom Carbie fuels both 3 & 4. Even a crook/bent reed would prevent 4 from receiving fuel.

Leave plug in 4 and place a grounded (spare) plug on number 4 lead. Start motor and check spark for strength.
Never start motor without pug in hole. Its starves piston, crank etc of oil, plus it will start a small fire at the back of the motor. Not a good look!

 on: January 15, 2019, 08:26:06 PM 
Started by antman - Last post by antman
Thanks Mercman
cranked the outboard at night . no leakage
when i cleaned the dizzy i checked all conections at the boot and spring sparkplug end  ..yes copper wire
sanded all contacts and springs and rotor and dizzy to remove any bad connection .corrosion
checked for continuity with a tester ..cranked engine with a spark tester and all good sparks
checked tooth on wheel and belt .. arrow and timing dots line up like a straight edge was used
dropped it back a tooth  .. starts  idles .. timing mark on flash on cylinder 1 is right on .......no 4 and line cast in top of castingPhoto i hope )
sticker could be wrong.....when arrow and marks line up ...idling on 800 rpm its timing at 4 - 6 deg on sticker marks
seems to be like they say in the manuals
any way  tes you are correct again Mercman ...no 4 plug is cleaner than the rest
has signs thats its been fireing but its not as oily and fuelie as the others  yet its getting good spark
surface disgarge plugs ..inner coil is black yet the outside circle is clean ..the other 3 are burnt black
i laugh as i know that im now moving to another part of the engine arnt i ...
lack off fuel getting into cylinder 4 ... even though i cleaned the carbies ?..
Compression  ...ill check 

 on: January 09, 2019, 05:46:33 PM 
Started by antman - Last post by MERCMAN
Are all plugs fouling equally?
Are any plug leads grounding out? Check for this at night time is best.
Have the plug leads been replaced by silicone? Should be good old copper on a '67 model, I reckon.  Undecided
Is an ill fitting plug boot preventing a good contact between the spring and the plug top?
Pull back all plug boots and examine all connections.
Is belt out by one tooth?
Was timing conducted at WOT? Mark, am I right here, I don't have my factory service manual with justme right now.
Re-check compression. Never trust hearsay.


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