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Old 18 June 2014, 14:02   #1
ncp
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Make: Avon 5.4m Searider
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Might have found a Yam 90 for the SR5.4

Ok, looks like this one isn't >$3,000!!!

It's a 1987. Does that scare anyone?

This owner has only used it in fresh water and can't vouch for the previous own (but this guys mechanic says he doesn't see any indication of past salt use).

Check compression, what else to look for???

I need to be sure it's worth looking at for $2100 - it's a 4 hour drive and I'd probab have to leave at 4A tomorrow to meet this guy.
(big rib is diesel, this will be my first outboard purchase)
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Old 18 June 2014, 14:03   #2
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Old 18 June 2014, 15:01   #3
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Looks good to me (i.e. worth the drive). Any idea on the hours?

In addition to checking the compression have a peek at the thermostats. You get a decent indication of the interior cooling passages just looking in there with a flashlight.

The impeller and plugs you should probably just plan on replacing for piece of mind and knowing their service status.
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Old 18 June 2014, 15:29   #4
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Looks good to me (i.e. worth the drive). Any idea on the hours?
The claim is 75 hours! I don't really know how to check that on a mechanical 1987 engine!
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Originally Posted by captnjack View Post
In addition to checking the compression have a peek at the thermostats. You get a decent indication of the interior cooling passages just looking in there with a flashlight.
Thanks. Another friend just mentioned to me that's where you would see salt issues, if any.
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The impeller and plugs you should probably just plan on replacing for piece of mind and knowing their service status.
Supposedly just changed - I have a call into his mechanic. He was planning on using the boat this season and already had service done but ended up getting a 4-stroke.
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Old 18 June 2014, 15:31   #5
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Lovin the Yam 90's, they are bullet proof, we fitted one the the RIB 4 Macmillan

Always worth doing a compression test
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Old 18 June 2014, 16:21   #6
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Compression test
Check throttle linkages for wear
Check inline filters for cleanliness
put a stethoscope on the gearbox if you can do it safely (prop off)
Without the engine on (key Out) put gears into forward and reverse and check for slip obviously you need prop on for that

There are a few circlip heads a and similar on the engine have a good look at these and there locatiions and the site of them to see if they have been looked after during regular maintenance
Run a digital thermometer over the exhaust ports. cylinder heads. and gearbox

They tend to go neer the Steering toob and trim area so check for signs of bad corrosion there

Any claim of hours used on an old engine is fantasy but if the engine has any blue sheen near the spark plugs that means its been overheated at some time

that engine is 35 rears old and they are saying it's done 75 hours 2 hour p year. I hope the owner got laid more than he used the boat in fact I hope that was the reason he didn't use the engine it but unlikely

These engines are old but gold lets hope you have found a good one it dos look very clean
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Old 18 June 2014, 16:38   #7
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Quote:
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They tend to go neer the Steering toob and trim area so check for signs of bad corrosion there

Any claim of hours used on an old engine is fantasy but if the engine has any blue sheen near the spark plugs that means its been overheated at some time

that engine is 35 rears old and they are saying it's done 75 hours 2 hour p year. I hope the owner got laid more than he used the boat in fact I hope that was the reason he didn't use the engine it but unlikely

These engines are old but gold lets hope you have found a good one it dos look very clean
I wont disagree with this fella ^^^ he's spot on with these details


.. I just sold a similar 75 which is the same motor, with different carbs .. yours looks very clean for its age ... the one I had never put a foot wrong .. they are an excellent machine

My steering bracket was soo rusty I worried every time
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Old 18 June 2014, 16:53   #8
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Quote:
Originally Posted by Rogue Wave View Post
Compression test
Check throttle linkages for wear
Check inline filters for cleanliness
put a stethoscope on the gearbox if you can do it safely (prop off)
Without the engine on (key Out) put gears into forward and reverse and check for slip obviously you need prop on for that

There are a few circlip heads a and similar on the engine have a good look at these and there locatiions and the site of them to see if they have been looked after during regular maintenance
Run a digital thermometer over the exhaust ports. cylinder heads. and gearbox

They tend to go neer the Steering toob and trim area so check for signs of bad corrosion there

Any claim of hours used on an old engine is fantasy but if the engine has any blue sheen near the spark plugs that means its been overheated at some time

that engine is 35 rears old and they are saying it's done 75 hours 2 hour p year. I hope the owner got laid more than he used the boat in fact I hope that was the reason he didn't use the engine it but unlikely

These engines are old but gold lets hope you have found a good one it dos look very clean
Wow...that's thorough....printing it out.

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Originally Posted by Bigmuz7 View Post
yours looks very clean for its age ...
Not mine yet!
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Old 18 June 2014, 17:52   #9
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we've had many of these over the years as has been said bulletproof in general

we found on older engines the Achilles heal was the lower crank seal which hardens over time & eventually allows water into the lower main bearing which in turn migrates up to the top bearing via the lube port
a big job to change as its the power head off but worthwhile if it saves the engine from self destruction as you cant see the damage being done until it too late
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Old 18 June 2014, 18:33   #10
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Boat name: DynaMoHumm/ SRV/deja
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Engine: Cat3126 Yam 90 &70
MMSI: 42
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Posts: 6,556
we will need to know if you bought it or if not why not!
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