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BF2 full throttle intermittent break up

H

Hondaeggbeater

New member
BAEL 1300019 2hp. Bought used and ran perfectly that year. Always ran out the carb each use. Emptied the fuel for winter. Next season only fired while pull starting. Replaced with new, the carb , coil and spark plug. Started on second pull and idle to half throttle is perfect. Half to full throttle it breaks up/looses rpms. But for seconds or a minute runs perfectly. I replaced the coil again. No change. I cleaned the carb and wired the ports out and blew it clear. New gaskets. No change. Am I looking at valve clearance problems? Weak valve spring? Head gasket is good and cylinder is not scored. Exhaust system is clear. Gas is new. Ideas?
 
Have you tried pumping the primer bulb when it does thiis?
You may also want to try running it out of a different gas container with a different delivery hose. If you don't have one or can't borrow, I've made a small "tester tank" out of a coffee can and 3/8" fuel line in a pinch.

What about the fuel pump? If pumping the primer smooths things out, it may be the pump not providing enough volume.

Good luck
 
Jimmy may be on to something....fuel starvation. However, there since the motor has a self contained tank and no fuel pump (gravity fed), the fuel filter may be slightly clogged. See part #1. It is located inside the nipple of the fuel tank. http://www.boats.net/parts/search/Honda/Outboard Engine/2000/BF2DY SA/FUEL TANK (1)/parts.html

I know....a crazy spot for a fuel filter.

It is possible that the valves clearances may also need to be adjusted, but you have to remove the power head to do that. So I would check the tank first.

Mike

Almost forgot....also check to be sure that the tank vent is working properly.
 
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No primer bulb. Internal tank. Fuel runs freely from tank to bowl. I have checked the strainer in the tank. The engine runs for over a minute with the throttle wide open and the fuel valve closed.
 
Well......I was WAY off!

But, after being enlightened by you and Mike, I started looking at the parts pages and see this little jewel has a GOVERNOR. And, since it seems you've eliminated fuel starvation (although I would STILL take apart and clean/inspect the tank vent as Mike alluded to) this COULD be a weak governor. I would say to try the valve adjustment but if it's easier to get to the governor, I would go there first.

If you do end up doing the valves, it might be "cheap insurance" to just go ahead and replace the springs. That is, of course, if the cam looks ok.

Good luck.
 
I have run it for 2-3 minutes with the tank cap off with no change. I have taken the bleeder screw out and let gas flow into a can with the vent open and it flows fine.
 
Your model is a BF2AW. 1998. Since it is an earlier model, it does not have a governor. The BF2D models do....it is inside the engine.

If you find that you may need to adjust the valve clearances, adjustment is different than the more current 2 hp. You have to change the tappet clearance adjuster to a different size until you get the correct clearance. http://www.boats.net/parts/search/Honda/Outboard Engine/1998/BF2AW SA/PISTON RINGS/parts.html

I have not done one of these adjustments. So, I do not know if you have to pull the power head or not.

Here is a stupid question.....could the crank shaft flywheel key be sheared and the flywheel is out of time?

Mike
 
Gaw-aw-ly!
I'm 0 fer 50 on this one!
I'll just shut up now.

But......

Hope we hear back soon that you found the problem.

Good luck.
 
I am a mechanic by trade. 2 cycle 4 cycle. Diesel an gas engines down to leaf blowers and chainsaws. That why i posted because I was hoping I was missing something specific to this engine before I rip it apart. It's driving me buggy.
 
I know what you mean. It would probably have me pulling my hair out. But having Mike on your team is Martha Stewart......(a good thing!)...=D
 
Jimmy,

Don't feel bad about the governor. I did not even know that the newer ones had one. I have never had to take one all the way down. By the way, perhaps I will put my frilly apron on and make cup cakes.....

Hondaeggbeater,

These engines typically do not have major issues. I am sure you know by now that this motor has an impeller and should only be run in water....as compared to the newer ones that are air cooled.

Here is a thought out in left field....have you checked the gear lube in the lower unit to be sure that there is not something going on inside there that could cause the motor to react the way it does?

As you can tell, I am kinda running out of ideas.

Mike
 
I changed it last year and only ran it a few times totaling an hour or two. So for last year it got its new coil and carb and ran exactly like this year. This year it got another new coil and a thorough carb clean and seals causing no change. Another problem is it's not heavy enough to be a good mooring anchor.
 
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