"I have a problem with my BF10. It will start up as normally, will idle and go into gear without any problems. . But then after a minute or so it will loose all its power and it will wiggle when I give it some gas. Then it will idle but cuts of shortly after. But when directly starting the engine again, it will again run for a few minutes, like nothing happened and then cuts out again. I cleaned out the carburetor, as a preventive measure, but the problem persisted. I noticed that the engine is getting quit hot( especially the valve cover) , so I blew out all the water passes(because the tell tale was pumping a good stream of water, so it wasn't the impeller). The problem stayed the same. Then I ran the motor without it's thermostat. The motor got a lot cooler and would ran for a longer period of time. So I bought a new thermostat. But after running it at slow speed for about an hour it had the same problem again. Then I removed the thermostat because I needed to get back home. I still kept cutting off, even though the thermostat was not in place. I decided to let the motor sit for 15 minutes (even though it was not that extremely hot) and was able to get back home (about 1 hour without any problems).
Back home I tried two things. Letting the motor run with and without thermostat. With the thermostat the engine would heat up pretty quickly and cuts of within 2 minutes (when revving it a little bit). Without the thermostat the motor seems the stay cool, but apparently still cuts off when letting it run longer. I am pretty sure the thermostat is good (put it in warm water and it opens all the way)
One strange thing I noticed is that the tell tale will remain cold, with or without the thermostat, but when blowing air through the one of the passes at the end of the water housing it will blow air out of the tell tale, so I suppose also warm water would come out there.
Is there maybe someone who could help me out, but I do not have a clue at all. I read some stuff about a broken oil pump, which could also cause overheating, put I have no clue how to check this"
Back home I tried two things. Letting the motor run with and without thermostat. With the thermostat the engine would heat up pretty quickly and cuts of within 2 minutes (when revving it a little bit). Without the thermostat the motor seems the stay cool, but apparently still cuts off when letting it run longer. I am pretty sure the thermostat is good (put it in warm water and it opens all the way)
One strange thing I noticed is that the tell tale will remain cold, with or without the thermostat, but when blowing air through the one of the passes at the end of the water housing it will blow air out of the tell tale, so I suppose also warm water would come out there.
Is there maybe someone who could help me out, but I do not have a clue at all. I read some stuff about a broken oil pump, which could also cause overheating, put I have no clue how to check this"