FS45 trimmer problem, help!!

[Hoji]

Yes I have a question for Goofaroo. .. Thought I would ask you this because of your experience with the different Stihl weed wackers.
Are the engines identical on the FS 55 vs FS 45 vs FS38?
Thank you.

 

[DND 9000]

The engines belong all to the same 4140 series. Displacement is 27.2cc.

 

[HarleyT]

Here..

 

[Goofaroo]

Yes I have a question for Goofaroo. .. Thought I would ask you this because of your experience with the different Stihl weed wackers.
Are the engines identical on the FS 55 vs FS 45 vs FS38?
Thank you.

I’m no expert on these engines but they look the same to me. The carbs were a direct replacement on all three trimmer models.

 

[HarleyT]

I’m no expert on these engines but they look the same to me. The carbs were a direct replacement on all three trimmer models.

They have a different crankshaft on the hedge trimmer.

 

[HarleyT]

But the fs38/45/55 are the same.
I have an fs38, on my old fs55 shaft, and it runs great.

 

[HarleyT]

The fs38s {newer} have a different throttle cable/carb connection, so the carbs will not directly swap.

 

[Goofaroo]

The fs38s {newer} have a different throttle cable/carb connection, so the carbs will not directly swap.

Hmmm. When I get a chance I’ll look at my FS38. I installed the same carb on it that I put on the 45 and 55 but I don’t remember if I had to alter the linkage on the 38.

 

[HarleyT]

Here is the one off of the fs38s, it is just the newer version, it may have been changed on the fs45s too before they stopped selling them in the US.

 

[HarleyT]

The hole is just a different size {z-bend},

but pretty much the same carb.

 

[HarleyT]

The older style had this type, where the barrel end fits in this piece.

 

[Hoji]

So I looked up the carburetor that I installed an am pretty sure it is the same one you recommend. Different seller but the picture is the same. It is not a stock picture but a sellers picture.... Looks super similar... Same spark plug pictured and background, camera distance etcetera.

I saw a HS45 for sale in good shape asking $60 maybe I will buy that for a sure bet backup.

Here is my HL45 with an engine from an HS55.

View attachment 767

 

[Goofaroo]

So I looked up the carburetor that I installed an am pretty sure it is the same one you recommend. Different seller but the picture is the same. It is not a stock picture but a sellers picture.... Looks super similar... Same spark plug pictured and background, camera distance etcetera.

I saw a HS45 for sale in good shape asking $60 maybe I will buy that for a sure bet backup.

Here is my HL45 with an engine from an HS55.

View attachment 767309 View attachment 767309 View attachment 767310 View attachment 767310 View attachment 767

It could be the same one but I’ve tried carbs that looked the same and they didn’t work. It sounds like it didn’t work for you either.

 

[Goofaroo]

The older style had this type, where the barrel end fits in this piece.

View attachment 766439

You can remove that piece and use the Z bend cable. It’s only held on by a circlip.

 

[HarleyT]

You can remove that piece and use the Z bend cable. It’s only held on by a circlip.

No, the hole is too big, too much slop.

Been there, tried that..

 

[HarleyT]

I just sell the carb with the throttle cable to be sure..

 

[Goofaroo]

No, the hole is too big, too much slop.

Been there, tried that..

Hmmm. I did that on something else recently and it fit. Must have been a different ZBend.

It could still be adapted. Sometimes the throttle shaft from the old carb can be put on the new one. I’ve also cut off part of the z bend and built it up with solder to form the bullet end. When you’re dealing with aftermarket parts you sometimes have to get creative.

 

[HarleyT]

I only deal with OEM.

 

[Goofaroo]

I only deal with OEM.

Are you a Stihl dealer?

 

[HarleyT]

No, I buy new units and part them out online.