Stihl 026 PRO

[bmp01]

Sounds like progress 🙂 thanks for the updates.

[peatff]

On 30/01/2025 at 14:34, bmp01 said:

What about a strobe light, could you use that at pull cord speed to see where it’s sparking?

Run it with a drill on the flywheel nut ?

[bmp01]

7 hours ago, peatff said:

Run it with a drill on the flywheel nut ?

I think that was the plan until Openspaceman found that the coil had stopped sparking all together (going by the posts above …)

[openspaceman]

8 hours ago, peatff said:

Run it with a drill on the flywheel nut ?

I have a starter pulley that has a hex drill adapter for stihl.

 

It's not a good idea to drive off the flywheel nut because when you stop the drill the inertia of the flywheel undoes the nut. I found that out long ago when flywheels had woodruff keys you could replace.

[peatff]

15 hours ago, openspaceman said:

I have a starter pulley that has a hex drill adapter for stihl.

 

It's not a good idea to drive off the flywheel nut because when you stop the drill the inertia of the flywheel undoes the nut. I found that out long ago when flywheels had woodruff keys you could replace.

That's a problem I never had.

[openspaceman]

On 03/02/2025 at 20:14, bmp01 said:

Sounds like progress 🙂 thanks for the updates.

Thanks to spud's link to the secondhand coil and flywheel I have it running with the coil.

 

It cuts well but takes a while to slow down to tickover once the throttle is released, any suggestions. First I will check if the butterfly is snapping shut but I wonder about an air leak.

 

I have a short video:

VID-20250206-WA0000.mp4 - Google Drive

DRIVE.GOOGLE.COM

which I will leave up for a little while

[spudulike]

4 hours ago, openspaceman said:

Thanks to spud's link to the secondhand coil and flywheel I have it running with the coil.

 

It cuts well but takes a while to slow down to tickover once the throttle is released, any suggestions. First I will check if the butterfly is snapping shut but I wonder about an air leak.

 

I have a short video:

VID-20250206-WA0000.mp4 - Google Drive

DRIVE.GOOGLE.COM

which I will leave up for a little while

No problem, glad it is running after my input.

Have you looked at where the impulse line joins the bottom of the cylinder base. I once had three 260s in with their impulse lines disconnected, all in the same week.

Your bottom end sounds lean. If the L screw is set to 1 - 1.5 turns out and it is doing this, expect an air leak and the impulse is the most likely candidate.

Some of the old carbs are a bit iffy on the 026, if you do test it and this draws a blank, I used to get secondhand OEM MS260 carbs off eBay and use those....and charge the typical ebay cost of £25 to the customer....before some troll has a go, you know how it is!

[openspaceman]

22 hours ago, spudulike said:

Have you looked at where the impulse line joins the bottom of the cylinder base. I once had three 260s in with their impulse lines disconnected, all in the same week.

Okay before I take it all apart it looks like I need to get the intake boot off to look at the impulse line but suppose this means taking the cylinder off?

[spudulike]

54 minutes ago, openspaceman said:

Okay before I take it all apart it looks like I need to get the intake boot off to look at the impulse line but suppose this means taking the cylinder off?

Noooooo, just look at the gap between the rear of the cylinder and the airbox with the top cover off. If the impulse has come off, you can use forceps to get it back on. The rubber may be a bit hard or even split. May be a good idea to replace it, go OEM as they are not expensive and better quality.

[Mark_Skyland]

4 hours ago, spudulike said:

Noooooo, just look at the gap between the rear of the cylinder and the airbox with the top cover off. If the impulse has come off, you can use forceps to get it back on. The rubber may be a bit hard or even split. May be a good idea to replace it, go OEM as they are not expensive and better quality.

Ive seen the same issue with the impulse pipe on the 026, I put it down to worn av rubbers causing too much movement.

As you have said forceps plus time, patience, lots of swearing and glasses for me.