Logo
FULL SITE MENU

bfa8 bzbc throttle problems

P

pmassey

New member
Hello i just purchased a small 16' boat with a Honda bf8a bzbc 1501542 motor on it. I took it out for the first time last night and it was running very strong all night until we stopped at or local Marina fir a burger.got back in the boat and fired her up and all it would do is about half throttle all the way back. It ran pretty smooth and would sit and low idle in neutral no problem just could not get full acceleration anymore in forward. I checked the linkage and it is fine, spark plugs look good as well. I have been running it this morning in a 55gal drum with the pro off ABCs it send to be running fine but i an about to go put it back in the water to see how she does...any ideas on what the problem is? Also how can i determine the year i have been searching all over the net and cannot find anything concretethat way i know what parts to order.thank you very much in advance for any help
 
Also sorry for all the incorrect words i wrote this on my phone and the auto correct seems to think it knows what I'm trying to write better than i do
 
Well, since I lost my dealer connection, this is where I get most of the parts I use;

http://www.boats.net/parts/search/Honda/Outboard Engine/parts.html

If you look, the index pretty much stops at 1997 and just lists "PRE 1997"

Yours looks to be "PRE 1997" and I have had good luck getting parts that work for older outboards just by using the horsepower rating. If you run across something you need that has been listed as "obsolete", then just go up the year model list until you find the earliest year that the part appears as "in stock"...usually works...not always...but usually.

As far as troubleshooting your problem, You didn't say whether or not it seemed to be running in the proper heat "range". Was the pee stream from the water pump good and strong? I'm not sure what year Honda went to a EPM (engine protection module) but if that were activated due to an overheat condition it would cause a loss of power like you describe. If you have a CDI ignition, then you MIGHT have an EPM. If you have breaker point ignition, then you will not.

Other than that, things that come to mind are;

Make sure it actually getting full throttle. Sometimes the linkage or the cable is stretched or broken and the carburetor isn't being opened all the way.

Make sure that you don't have any fuel delivery problems. A tank vent that has vibrated partially closed will starve the engine for fuel. A cracked or old fuel tank hose can break down internally and an internal "flap" can develop causing a sort of valve like action to block the flow of gas just when you need it most. An old hose or loose hose clamp can allow air to enter the fuel system and starve the pump.

The thermostat is stuck open or missing and the engine is operating "cold" causing the plugs to foul. OR...
Defective spark condition caused by the above or a bad plug or plug wire.

If either of the above, you need to determine if it is running on just one cylinder. These little outboards run surprisingly smooth on just one hole. While running the engine, use a pair of insulated pliers to pull the upper plug wire off and listen for a change in rpm. If no change, the cylinder was NOT firing. If the engine stumbles a bit and/or dies, then that cylinder was working before you killed it. Remember though that they run fairly smooth on just one cylinder so you need to pay attention.

If pulling the upper cylinder wire makes no difference, then put it back and pull #2, repeating the test.

This is MUCH easier accomplished if, before you test, you first pull each plug wire off while the engine is stopped and apply a bit of DI-ELECTRIC (tune-up) grease to the inside of the spark plug wire boot. This little trick makes it easy to pull the wire off and put it back on.

If you find that one cylinder is not contributing, then it becomes a matter of finding out why. Usually a plug or a wire has gone bad. If it is a plug, that would be an easy fix. If it is a wire, then, usually, you need to replace the coil. Not so easy on an older outboard. Most of the old coils have been "discontinued" and you will need to find a substitute. Using the "next model year up" as described above can work, but not always.

If it is neither of the above, then it will either be an EPM issue as previously stated or a mechanical problem with the offending cylinder. This will require further testing as in visual inspection/adjustment of the valves and springs and/or a compression test.

If you find that the engine seems to be running ok and is not "de-powering" electronically, then you may need to carefully inspect your propeller hub. They can deteriorate and "slip" in the water making you think the engine is not running right. With the prop installed on the outboard, with the outboard in gear, you should not be able to get any movement from the prop when turned by hand unless the engine turns as well. If you do, then the hub has partially spun. CAUTION! Only attempt this check with the kill switch activated to prevent accidental firing of the engine and personal injury.

Good luck and I hope this helps.
 
Your serial number indicates that it is a 2000 model. Model number BF8AYXA.

There is also an outstanding recall on the flywheel. http://marine.honda.com/owners/recalls
http://marine.honda.com/owners/recalls

You should take it into a Honda Dealer and have them change the flywheel per Service Bulletin #44. It is an official recall and it does not matter who the owner is or when it was out of warranty. They will change the flywheel and adjust the idle and adjust the throttle adjustment to minimize overreving while in neutral.

Most likely, they will have to order the flywheel, since most of these recalls should have already been done. The records for your motor, indicate that it has not been done.

If not done, it is possible that the flywheel to could fly apart and cause injury.

Mike
 
Thanks for setting him (and me) straight Mike. I sure I blew that call! I'd hate to have the flywheel hit somebody in the head while they were following my instructions ;~(>. Not Good!
 
Jimmy,

The only thing I can see wrong that you told him was the year of the engine. All the other info looks valid. Besides.....the only person that does not make a mistake is not doing anything....

One additional problem could be water in the fuel or just bad fuel.

Mike
 
Back
Top