tecumseh TC200 and Walbro problem

[Hexar]

Hi Guys,
I was given a dead mini tiller that comes with a TC200 engine and a Walbro diaphram carburetor. I took it apart and managed to clean the carburetor and now it is running.

It idles good, and when it is cold, I could revs it high.

Once it warms up, it idles not as good, but can still idle. But if I rev up the RPM, it dies, almost like running out of air or out of fuel? If I am fast enough, and back off the "throttle", engine will manage to back to idle and not to die.

the carburetor only has a idle screw which just set the position of the throttle butterfly relative to the 3 idle jet holes.

There is a idle/low speed mixture adjust screw, which I back out about 2 turns, if I back out more or tighten it more, engine will not idle good.

There is no "high speed mixture adjust" screw, so I guess the amount of fuel for high RPM is fixed?

sorry for the long post, basically my question is: what can cause the problem I described? OR maybe I should not open the throttle THAT much?


Thanks!

 

[Kenny_McCormic]

First write to the EPA, letter should read " you!" as this is their fault for forcing the engine to come with a non adjustable carb. I bet your problem is the EPA carb is too lean. DO NOT free rev it past 3600 RPMs!

 

[Russ2251]

Get a 'new' fully adjustable carb. They aren't very expensive and are much less of a headache.
Whenever I salvage an engine, the first thing that goes is the emissions carb.
They just aren't up to what we want them to do.

 

[2or3wheels]

hahaha its amazing that when you guys talk about salvaging a engine it HAS a EPA carb all mine anr never from the 90's 80's at earlyiest but most older. Still run and give you the same WHOOO HOOO feeling.

 

[Russ2251]

As we all know, no 2 engines are identical.
Logically, it follows that no 2 carburetors are identical.
It is beyond me how the EPA can think that emissions carbs solve any environmental issues in the big picture.
This may be a stretch, but it is my belief that most folks would be keeping their machines longer if they ran properly for say 10 to 30 years (the way they used to).
Not a week goes by that I don't see a trashed gas powered something-or-other sitting on the curb. Usually they're just a handful of years old.
A large amount of them have induction/emissions related problems (stalling, surging etc.) which can be expensive to repair.
It's been my experience, for the most part, that engines tend to run leaner over time. The cure was to richen the mixture.
To solve this lean problem, we now have to replace the whole carb or re-jet. This is something the average consumer doesn't want to get involved with.

 

[2or3wheels]

very well thought out and true

 

[Kenny_McCormic]

Yep goes along the same lines as a Prius is WORSE than a F150 counting in their construction AND use for 10 years. Because of the huge hazardous waste batteries in them and all the crap the factory that makes said batteries spews out. Sure the F150 spews a little more CO but the factory has grass growin on the roof.

 

[Hexar]

Thanks Guys! Did not know there was an EPA regulation...

the tiller looks like late 70's or early 80's, it is of Garden Way brand, with red color. So did they have EPA carb that early?

Also, good thing about this tiller is, it has a transmmision and a cluth...