Chain running on idle stihl 028

[sixstrings]

Been borrowing my old mans 028 super and I can't seem to stop the chain running on idle. Checked clutch springs and fettled the idle and low adjustments with no luck.. Maybe needs a Carb kit? Anything else I should be checking here??

[Rich2484]

Is the chain actually tight enough.

[GardenKit]

You really need to know if your idle is too high, or if the clutch is engaging at too low a speed.

 

So you need to tach the saw at idle, it should be 2600 revs.

 

If it is too high and wont come down then sort out the engine and carburation.

 

If it is correct then sort out the clutch.

[spudulike]

Following on from Gardenkits advice,

 

Clutch springs are the usual culprit - does the saw stall when the chainbrake is put on? The springs may look OK but they do lose their tension and clutch spring seats can wear!

 

Other things it may be - tight needle bearing, dirt & grot around the clutch and clutch drum, twine wrapped around the crank shaft and clutch.

 

It may simply be the idle speed - have you tried taking it down a bit so the engine idles firmly without stalling but not racing?

[sixstrings]

Thanks for all help.

 

Chain tension is fine, still runs when over tight too.

 

Clutch springs do look fine, didn't consider they could be worn.

 

Have tinkered with the low and tried to balance the idle like I have before on other saws but it's not solving the issue. Too low and the chain is still wanting to run and the engine is just cutting out.

 

Sounds like best option is to drop it in and get it tach'd

[sixstrings]

Also, no not stalling when chain brake applied.

 

I can forsee it being carburettor related tbh.

[spudulike]

TBH I would put money on this being tired and stretched clutch springs allowing the clutch to engage at too low revs.

 

All the tach will do is set the idle at the correct idle speed and if you have already lowered it to a point that the engine nearly stalls, it won't have the desired effect.

 

If the engine continues to run with the brake on then there is no binding between the clutch drum and the crankcase!

 

All points toward clutch springs IMO - under £5 to purchase and reasonably simple to fit!

[Rich2484]

TBH I would put money on this being tired and stretched clutch springs allowing the clutch to engage at too low revs.

 

All the tach will do is set the idle at the correct idle speed and if you have already lowered it to a point that the engine nearly stalls, it won't have the desired effect.

 

If the engine continues to run with the brake on then there is no binding between the clutch drum and the crankcase!

 

All points toward clutch springs IMO - under £5 to purchase and reasonably simple to fit!

 

What he said. Springs. But get them online quick before the 3rd:lol:

[sixstrings]

Okay cheers guys, I'll give the new springs a try. And let you know how I go.

[sixstrings]

found some old springs knocking around and it has definitely improved things. 3 new springs will sort it I reckon.

 

good work guys, cheers.