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2022/03/09 17:51:59
donzoh1

troy bilt squall 2100 208cc carb question

I took the carb apart and cleaned it, especially the main jet and emulsion tube which were plugged with corrosion. I also checked the carb float function and that seems to work. After installing the carb again, it starts easily, and the choke seems to work as it should. However, if power is added past about 30 percent, it stalls. Am I correct to believe this could be a lean condition caused by a fuel supply issue? Did I mess something up on reassembly? The carb is the factory original. It has a D shaped screw head near the throttle that I was thinking might be a mixture control?
 
I was unable to reply so I'm adding this: The carb is the HUAYI which I believe is factory original. I wasn't particular about the orientation of the hole in the bolt if any. Also, I don't even see a fuel filter on it. It looks like the supply line (about 12 inches long) goes directly from the carb to the fuel tank with no shutoff or filter in it.
 
I still don't have some permission so I'm adding to this original post...
The only problem I see is the engine cutout after about 1/3 throttle. The engine continues to run if the throttle is slightly backed off. There's no surging at all. The choke position is at the low end throttle position of the throttle lever. I guess I could take the lever off and then try to answer the choke/throttle question. I did try to blast all of the passages when I had it apart but I'm guessing it can probably be disassembled a bit more. The only internal parts I removed was the float/valve and the emulsion tube/main jet. 
 
So I could back out the black plastic D screw and clean in there maybe. I could get a pic at some point but I don't have the machine handy right now.
4 comments Leave a comment
Conrad Sigona
A picture would be nice.
 
Yes, it's likely it's a lean condition. Check the flow into the carburetor, for instance, is the fuel filter dirty. I have another guess, but it's a long shot. On older Tecumseh engines (your engine is probably neither old nor Tecumseh), the brass bolt holding the bowl needs to be screwed to a particular direction or 180 degrees to that direction. That's because there's a hole drilled horizontally through the bolt and that hole has to line up with the fuel passage for you to get full flow. If it's not lined up, you'll get restricted flow, so the engine works, but not at rated speed. Such bolts typically have a < stamped into the bottom.
 
Send a photo and maybe we can guess some more.
2022/03/09 20:03:38
Conrad Sigona
I found a picture of what I believe is your carburetor. You can ignore all that nonsense I wrote about a Tecumseh carb. When you write of a D-shaped screw head, are you referring to the black plastic tube beneath the black screw which adjusts the throttle idle speed?
 
2022/03/09 20:10:29
SRTsFZ6
The D shaped screw is a jet and has an extremely small opening in it which does clog. Remove the idle adjuster screw and the D jet simply comes out from the top. There's also usually an o-ring around the jet.  
 
It generally, when clogged, the D jet, (or too lean from the factory) will cause surging, not high RPM issues.
 
Will the engine rev up with the choke partially on?  If so, you've just confirmed a lean issue.
 
With what you've posted, I suspect the carb is still dirty inside the passages
2022/03/10 08:49:30
Conrad Sigona
Do what SRTsFZ6 says: Back off or remove the + screw, then remove the D jet. Clean inside, clean the jet itself.
 
In general, when cleaning a carburetor with which you're unfamiliar, it's good to tear it down as much as possible. When you think you're done disassembling, look closer and you'll find more opportunities. Look for all the little holes, all the little tubes and passageways. For instance, you'll find tiny holes in the throat of the carburetor. Clean them by shooting carburetor cleaner into the holes (use the red tube on the can) and pay attention to where it comes out. If you can see fluid shooting out from another hole, that passage is clean enough. You can also use compressed air, not so much to clean, as to ascertain whether a passage is open. Pay careful attention, when disassembling, to how the parts go. Take photos if necessary. It's usually necessary if you're not going to put things back together right away. It's amazing how much I can forget if I wait just one day before reassembling. Be careful when you're looking to unplug a passageway. Don't use anything hard, like a steel wire or paperclip, and don't use force. I use fine copper wire (take a piece of stranded electric cord, remove the insulation, and pull out one wire from the strand) to probe the passageways.
 
Also do what SRTsFZ6 says about testing for a too-lean condition. Add throttle until you feel the engine resisting, then add choke to see if it calms down, then add more throttle, etc. If you find that you can speed up the engine more with some choke than with no choke, you have a lean problem.
 
As for permission to reply, I ran into the same difficulty a few months ago. My solution was to not use Google Chrome. With Firefox, for instance, I was able to reply.
 
 
2022/03/11 11:00:42

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