Re: 2010 Tohatsu MFS6B Carb Rebuild
Additional info and question. As you could tell from the picture in my first post the carb was pretty dirty. I'm able to believe that my ultrasonic cleaning didn't get everything and that's contributing to the stumbling. My plan is to disassemble and clean again using pvanv's advice of a 4 hour dip and cleaning to see if it helps.
So I went out and bought a bucket of carb cleaner made by "Gunk". There are warning all of it not to put plastic in. So my question is do I have to worry about the linkages and choke plates, etc...? I didn't remove those items for the first cleaning.
Thanks.
You do not need to remove the hard plastic bits, such as the choke actuator arm. They would be very difficult to reinstall anyway
Ultrasonic cleaning is fine. Excellent in fact. But what liquid you use is more important, as it needs to be able to dissovle the organic deposits in a reasonable amount of time without etching the anodizing off of the carb.
On a B or C series carb, even if clean as a whistle, it may have a little stumble, under load, especially if not fully warm, and if you really snap the throttle open very briskly. That's a side-effect of the more stringent EPA standards, which forced the engine manufacturers to run even leaner than on the A models. On a varnished carb, the motor might even stall if accelerating too rapidly. However, with a clean carb, if you operate the throttle "normally", allowing say about 2 or 3 seconds to transition from idle to WOT, that should not be a problem.
