Stihl 026 Air leak or carb ?

[wildwes]

That's a good idea and it's what I would do.
From the sounds of things the carb is just too lean, which almost all of those fixed jet 260 carbs were.
Although a P and V check isn't a bad idea.

I had a very low hour 260 doing almost the same as well. Fuel line was cracked, replaced that and it was still doing the same, just not as bad. Swapped a WT194 on, and stuck a new impulse line on as well for good measure, and it ran like a new saw.

 

[Vintage Engine Repairs]

I will replace this non adjustable carburetor regardless.

No worries, yep nice to have an adjustable one. As Jerry said, WT 194 seems to be the go. Not certain what mine is on my 260, but has a bypass drilling in the main jet, though it doesn’t seem to affect the range in which I tune it at so I leave it.

Then again I don’t modify or port anything. It’s bone stock, even taking the modified muffler off and putting an original, but with a spark screen, back in.

 

[ZeroJunk]

OK. I put the new carb on this morning. Assume it is a WT194, didn't think to look. Only OEM Stihl carb available anymore.
I never touched any adjustment other than to idle it down a little. Settled down around 13,600 no load. Sounds good.
Out the door she went.

 

[bwalker]

OK. I put the new carb on this morning. Assume it is a WT194, didn't think to look. Only OEM Stihl carb available anymore.
I never touched any adjustment other than to idle it down a little. Settled down around 13,600 no load. Sounds good.
Out the door she went.

In the future keep in mind the WT194 is still available from Walbro. I bought several off ebay.

 

[ZeroJunk]

In the future keep in mind the WT194 is still available from Walbro. I bought several off ebay.

It was $74 and change. We only use OEM parts if they can be had. Policy.

 

[president]

No worries, yep nice to have an adjustable one. As Jerry said, WT 194 seems to be the go. Not certain what mine is on my 260, but has a bypass drilling in the main jet, though it doesn’t seem to affect the range in which I tune it at so I leave it.

Then again I don’t modify or port anything. It’s bone stock, even taking the modified muffler off and putting an original, but with a spark screen, back in.

View attachment 1116450

Tom, can you explain bypass drilling?

 

[Vintage Engine Repairs]

Tom, can you explain bypass drilling?

Sure, a bypass is a jet or drilling that bypasses the H adjustment screw which will constantly feeds the engine regardless of the position of the needles. They’ll be most often found in the top of the brass main nozzle, if not, you’ll find them as a brass jet that has a flat head slot in. They limit the effectiveness the H screw.

 

[Oletrapper]

OK. I put the new carb on this morning. Assume it is a WT194, didn't think to look. Only OEM Stihl carb available anymore.
I never touched any adjustment other than to idle it down a little. Settled down around 13,600 no load. Sounds good.
Out the door she went.

Hope you meant 1360 and not 13,600 lol OT

 

[ZeroJunk]

Hope you meant 1360 and not 13,600 lol OT

No, 13,600 is correct.

 

[wildwes]

Hope you meant 1360 and not 13,600 lol OT

I think he meant 13600 WOT with no load, not 13600 on the idle.

 

[ZeroJunk]

I think he meant 13600 WOT with no load, not 13600 on the idle.

One that would idle at 1360 would be something .

 

[president]

Sure, a bypass is a jet or drilling that bypasses the H adjustment screw which will constantly feeds the engine regardless of the position of the needles. They’ll be most often found in the top of the brass main nozzle, if not, you’ll find them as a brass jet that has a flat head slot in. They limit the effectiveness the H screw.

Thanks Tom

 

[Oletrapper]

No, 13,600 is correct.

"I never touched any adjustment other than to idle it down a little. Settled down around 13,600 no load. Sounds good."

The way I read your post is that you idled it down a little. And the idle was down around 13,600 no load.

 

[ZeroJunk]

"I never touched any adjustment other than to idle it down a little. Settled down around 13,600 no load. Sounds good."

The way I read your post is that you idled it down a little. And the idle was down around 13,600 no load.

No

Problem , that is just not what it said.

 

[ballisticdoughnut]

In the future keep in mind the WT194 is still available from Walbro. I bought several off ebay.

Yep. WT-194-1 got a few myself.