a friend of mine has a 2006 Honda BF50 which stalls when putting the throtle to wide-open starting from being neutral.
Looking at the prime bulb, it is like not having gas at all in it. If we throtle up in small steps the outboard runs nice. I think the problem is on the lower revs.
Can you help me diagnose possible causes? Perhaps the carbs not being synced?
If the primer bulb is soft I'd say the problem is before the carbs so I'd check:
- air vent on tank
- fuel pick up is not blocked
- primer bulb is working correctly
- fuel line has not disintegrated internally
- fuel filters are not blocked
- fuel pump diaphram is intact.
But I am not an engine expert so someone else may have more specific/better advice.
Yes, if choke sticks, it will cause too much fuel into one cylinder which could potentially make the spark plug "wet" so it won't spark.
With these problems you should do a proper diagnosis step by step, do some research on the net and check the whole system, you sometimes find things which need fixing but are not the main culprits!
Do Check your Fuel Tank, Fuel Line, and Prim Bulb, if old then change them,
Watch the fuel filter and first of all make sure it is clean, then see if you can see the fuel coming into it (from fuel pump) continuously at both low and high revs
Check ALL spark Plugs
Check ALL Spark Plug Cables and Make sure you have Spark.
But if the choke was sticking, wouldn't it give problems in the high revs too?
Not stuck fast, it just lags the throttle response. So when you suddenly go WOT its flooding. If you slowing increase throttle the sticky choke gradually opens.
Needles get junk in them and floats can stick too.
I would just start by:
checking tank vent (easy)
replacing fuel filters (easy)
checking all plugs and wires (easy)
rebuilding the carb (bigger pain)
