Stihl 084 Tillotson carb issues HT-2A

[Callum]

I have recently purchases an 084 fitted with a tillotson HT-2 Carb. the carb seems to be over fuelling the saw even at its leanest setting. I believe these carbs have a second high speed circuit. My question is, has anyone else come across this issue before, and if so what was the solution? I have swapped a Carb off a different saw onto it and it runs much better with no rich running issues. I also have a carb kit on the way, but it wont be here for a week or so.

 

[Tim N]

HT-7A. They are fully adjustable.

 

[Callum]

HT-7A. They are fully adjustable.

i was looking for a way to use my current carb.

 

[Coupe]

Also check your metering lever level.
Could be the problem

 

[Gullet]

Also check your metering lever level.
Could be the problem

^^^ THIS!

 

[srcarr52]

Metering lever is too high or the diaphragm is old and stiff holding the needle open.

 

[Dolkitafreak]

They have a fixed nozzle in the carb, very common. Even closing the H needle it still overfuels as a method of limiting rpm.

 

[RNOAIN]

The workshop manual explains that different carburetors could be mounted depending on the country.
HT-2 is a fixed jet carburetor. The H screw is always closed.

I am thinking of changing to a fully adjustable one like the HT-7.

Can anyone provide more information?

 

[Dolkitafreak]

The workshop manual explains that different carburetors could be mounted depending on the country.
HT-2 is a fixed jet carburetor. The H screw is always closed.

I am thinking of changing to a fully adjustable one like the HT-7.

Can anyone provide more information?

What information would you like? If you have a fixed jet carb, there are multiple available that are adjustable.

 

[RNOAIN]

My 084 has a fixed jet HT-2
It works well but at idle speed it stops after a few seconds.

The fault is for sure the carburetor, because I have tried with another one and the fault is eliminated.

I wanted to change it and mount an adjustable one. Using a tachometer there should be no problem to adjust the H screw.
I think the reason for fixed carburetors is to prevent the user from adjusting the mixture too lean.