Our Bearcat wood chipper 70085 has been sitting for over a year. The deep cycle battery died a couple years ago so I rely on the pull start, which works great. Until the other day.
I did get the engine to start but once the engine warmed up, I could not turn down the choke otherwise it would stall. So there’s a problem with the fuel or the choke itself. The choke appears to be fine. “Time to strip down the carburetor” was the advice of brother Mike, the family guru for all things mechanical.
So I started with taking off the filter to look inside and make sure the choke was operating ok. It was fine, so it was time to consider a fuel problem.
Disclaimer: I’m not a mechanic. Neither do I claim to be. So take the advice here for what its worth… free. You get what you pay for 🙂 I think I am right but am willing to admit I’m wrong so if you read something I said that is incorrect, by all means, post a comment below and I will correct it.
Below the carb is a float bowl. Its where the gas sits while travelling from the gas tank to the carb. Its called float bowl because in it is a round, white piece of plastic that floats in the gas and acts like the shut off mechanism in a toilet water tank.
A small brass tube runs from the float bowl up into the throat of the carb. Fuel is drawn up through a small hole in the tube and sprays out into the passage of the carb. The fuel mixes with the air as its drawn into the engine. That’s my understanding of how it works.
(Click on pictures for larger images).
The parts of the float bowl are below. There are the 2 mounting screws, the aluminum bowl (left) with spring (inside). And the white plastic part is the float mechanism. There is one more part and its a small brass part that you can see in the picture, in the center of the float mechanism (small dark spot).
With the float bowl removed we can now see the underside of the carb (below).
In the case of my repair, the small brass part in the float mechanism had some grungy stuff on it. Upon removal, I could see that there is a hole in this little part. A small hole at that. I had to use a needle to clean it out. So its all cleaned out and I can clearly see a hole in this part. My guess is that this little part is where fuel is drawn up into the carb. Hopefully problem solved.
After lunch, went out and first pull, perfect 🙂 Choke works fine now.