[Rhodes22-list] Honda BF9.9 Oil from carb

[PBR]

Thanks Roger,
I will try all of these suggestions.  I'll keep you all posted but it might
take me a while to find the time.  I do use just ethanol free gas and my
modus operandi has been to run the gas out, but I admit during this time
when I have been just starting and running the motor periodically I
probably have skipped that a few times.  I have a compression tester with
the rubber insert.  Came with a tune up kit I picked  up about 35 years ago
so probably american made and still working...  To do this I am guessing I
would hook up the battery and crank the motor while holding the tester in
place?  both plugs out or one in one out. (I seem to remember with 8 cyl
engines my pals just did one at a time and started the engine).

I do have an alternate motor ready to go on a Rhodes so if I get some
sailing opportunities I have no excuses not to get out there.

Patrick


On Tue, Apr 2, 2024 at 11:24 PM ROGER PIHLAJA <roger_pihlaja at msn.com> wrote:

> Hi Patrick,
>
> I’ve been thinking more about your issue with engine oil dripping out the
> carburetor.  Check the engine oil level with the dip stick.  If the oil
> level is high; then, you may have an issue with the float level in the
> carburetor.  High fuel level in the float bowl would allow fuel to
> contaminate the engine oil.  Eventually, the diluted engine oil level would
> get high enough that oil would start backing up into the carburetor,
> resulting in your observed carb oil drip.  A sticky float would be
> consistent with an engine that sits a lot between runs.  I always
> disconnect the fuel line and run the engine until the carburetor runs dry.
> I think this explanation is more likely than stuck or worn piston rings.
>
> Roger Pihlaja
> S/V Dynamic Equilibrium
> 1978  Sanford, MI
> Sent from my iPhone
>
> > On Apr 2, 2024, at 4:02 PM, ROGER PIHLAJA <Roger_Pihlaja at msn.com> wrote:
> >
> > Hi Patrick,
> >
> > I have a Honda BF9.9AXSA outboard motor, model year 2000.  I use it on
> my Walker Bay RIB.  If you have a compression tester, you can quickly
> determine the status of your piston rings and valves.  The factory
> compression spec is 156 +/- 14 psi when the engine is cold.  If your
> compression meets spec in both cylinders; then, your piston rings and
> valves are OK.  If the compression values are low; then, squirt some engine
> oil into the spark plug hole on each cylinder and retest the compression.
> If the compression improves; then, you have worn/stuck piston rings.  If
> the compression does not improve; then, you have valve leakage issues.
>  The only way to fix valve leakage is with a cylinder head rebuild.
> However, since your engine still runs, if your problem is stuck piston
> rings; then, you may be able to free them up.  Drain out about ½ the
> crankcase oil and refill with a product like Slick 50 Synthetic Oil
> Treatment.  Squirt some Slick 50 into each spark plug hole, gently crank it
> over a few revs, and then let it sit overnight.  The next day, start the
> engine, and let it run at idle for 15-20 minutes.  Then, shut it down and
> change the oil.  Hopefully, this will free up the piston rings.  I don't
> have much faith in any fuel additive's ability to free up stuck piston
> rings.
> >
> > My M/Y 2000 engine has a crankcase vent that dumps directly to the
> atmosphere via a rubber hose on the port side.  The crankcase breather
> cover sits just in front of the timing belt sprocket on the top of the
> engine.  I've never had my breather cover off because I've never needed to
> get in there.  However, given that it vents to the atmosphere, I doubt
> there is any sort of PCV valve that might get stuck or clogged.  However, I
> suppose it's possible the vent port itself &/or the hose might be clogged.
> So, it might be worth a look underneath the breather cover just to verify
> that the plumbing is free and clear.
> >
> > Try these suggestions and let's see what happens.  Good Luck!
> >
> > Roger Pihlaja
> > S/V Dynamic Equilibrium
> > 1978  Sanford, MI
> >
> >
> >
> > ________________________________
> > From: Rhodes22-list <rhodes22-list-bounces at rhodes22.org> on behalf of
> Michael D. Weisner <mweisner at ebsmed.com>
> > Sent: Tuesday, April 2, 2024 2:12 PM
> > To: 'The Rhodes 22 Email List' <rhodes22-list at rhodes22.org>
> > Subject: Re: [Rhodes22-list] Honda BF9.9 Oil from carb
> >
> > Patrick,
> >
> > I think that if you have a problem with "stuck" piston rings, you would
> know it. I would suspect that there would be a loud noise and the engine
> probably would not run at low speeds as it seized up.
> >
> > My guess is more a problem with the crankcase ventilation system.
> Usually there is a PCV style one-way valve that sucks oil fumes out of the
> crankcase, burning them by introducing into the air intake. Check the air
> filter which is usually part of the recirculation circuit as it can become
> saturated with oil.
> >
> > Is the engine consuming oil? Have you checked the oil level using the
> dipstick? The smoke and excess oil can be the result of worn (not stuck)
> piston rings or valves that are allowing the oil to pass into the
> combustion path.
> >
> > Mike
> > s/v Wind Lass ('91)
> > Nissequogue River, NY
> > I’d rather be sailing :~)
> >
> > -----Original Message-----
> > From: Rhodes22-list <rhodes22-list-bounces at rhodes22.org> On Behalf Of
> PBR
> > Sent: Tuesday, April 2, 2024 1:52 PM
> > To: rhodes22-list at rhodes22.org
> > Subject: [Rhodes22-list] Honda BF9.9 Oil from carb
> >
> > Hello all.
> >
> > I have a Honda 9.9 2 cyl.  that has been mostly sitting for a few years.
> > It sat on the boat in Kitty Hawk (humid environment) for one winter
> untouched (2018).  Since then I have not used it on the water but always
> expecting that I might anytime soon I did not winterize but dutifully
> started it every couple of months throughout the winters and ran it a bit
> with the water hose.  Always started easy and ran good.  Some smoke at
> first but not enough to concern me.  This time as I was about to put the
> thing in to use I put a bucket (trash can ) around it and ran it again.
> > Started easy , runs good, again some smoking, enough to get me curious
> but not constant at all speeds.
> >
> > Looking under the cowling I see oil dripping from the carb intake (clean
> golden oil).  Still running fine.I am hoping there may be a *vent clog* or
> something rather than just frozen rings.  Any thoughts?  *Stuck valve?* (
> but runs pretty good)
> >
> > This 1999 motor has VERY VERY low miles and looks brand new so I hate to
> scrap it but given the date of manufacture the value is probably less than
> a marine repair will charge me to take a look.  Hoping for a miracle
> solution.  Twice I have removed mud dauber bee nests from under the cowling
> so maybe I can find something suspicous.
> >
> > The trash can I ran it in did have some residual oil clinging to the
> sides but I don't know how much might be normal.
> >
> > My plan next trip in a couple of weeks is to look for clogs and try
> running again maybe with a high dose of sea foam or something.  Not sure of
> any miracle sauce that might help stuck rings.
> >
> > Patrick
> >
>