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late 90s honda 9.9 no start

T

tonystones

New member
Hey guys,
new to this forum, and boat motors (coincidentally:rolleyes:). I bought a sailboat and this motor was on it.
I suspect the last owner left it in its enclosed hole for a long time and it never was serviced. So I changed plugs and fliter and fired it up. it ran reasonably well for a short time then began to stall. had it going well but would not idle took it for a cruise around the bay and after a short time the engine stalled and would not start again (or even cough sputter or smoke). i put my hand on the thermostat and it was quite warm but i could still keep my hand on it (uncomfortably warm but not spitting hot by any means) pulled the thermostat and it wasnt opening. Engine cools down and still no fire! seems like i have no spark. :eek:
getting back was done with oars:(
so I bring the motor to a local guy who fixes outboards
hey puts a new sensor in it and gets spark back, everything good that way.
but the engine will not go. It only ran once with the choke in cold and throttle low, and it only ran for maybe 15 seconds then nothing! sounds like a carb issue, so we cleaned up the float bowl with compressed air and wd40 and it was quite clean already. still nothing. the bottom pug is getting wet and the top plug is not as bad but wet also. put three different sets of plugs in, a known good coil and ecu , also checked the wooddrift pin on the flywheel (flywheel was quite rusty even on the magnets but I should get something right?. we have good spark have checked with a calibrated tester also i have good compression 75lb top and 71 bottom
my mechanic is stumped ! and so am I to say the least
the fact it would run for even 15 seconds then nothing; this is a weird one.
any insight into this would be really appreciated.
thanks
tony
 
What is the serial number on the frame. That way we can know for sure which vintage it is.

Also...did you check the compression with the throttle wide open? If not, you should. Depending on the vintage, the 9.9 should have 150 plus on older vintage to around 200 on the new version.

It sounds like you may have the newer version since you discussed sensors. The only sensor that I know on the older version is an oil pressure sensor. When they overheat, they just sort of lock up and stop.

Mike
 
Mike
i will have to double check the compress test to make sure that sounds bad. So with low compression I will still get no action at all? i thought it might chug or something but i don't know boat motors

also about the sensor now that i recall the green flashing oil press light has not come on since the engine quit. It should flash even when cranking right? we tried grounding the yellow wire coming from the ecu to the light ( i read it is either open or closed) and nothing.

I personally think the compression may be the problem as i have a clear strong spark on both plugs, though the light going out at the same time as the engine is mighty suspect:confused:

engine #s are:
BF9.9AM
typeLCS
BABL-1208283
 
Last edited:
tonystones,

First off, welcome to the forum.

Well, it HAD "decent" compression at one point or it would not have started and run at all. I hate those sailboat wells! They are a death sentence for an outboard. Kinda like a roach motel. Once they go in, they don't come out.

You've got the best on the case with hondadude so follow his lead.
 
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