stihl 088 weak spark

[13glen7]

Hi all I have an 088 that's not working. It had a new pot and piston 3 year ago it ran great for a year or so then one day the woodruff key went on the flywheel. So I got a new one put it in and didn't start the saw for a while. Now it starts but is rough and backfires. I have put a new plug and coil on with no luck the spark looks weak. I'm stuck. Any ideas?

[mendiplogs]

Hi all I have an 088 that's not working. It had a new pot and piston 3 year ago it ran great for a year or so then one day the woodruff key went on the flywheel. So I got a new one put it in and didn't start the saw for a while. Now it starts but is rough and backfires. I have put a new plug and coil on with no luck the spark looks weak. I'm stuck. Any ideas?

 

Hi mate Steve your man on here thanks Jon

[spudulike]

Hi all I have an 088 that's not working. It had a new pot and piston 3 year ago it ran great for a year or so then one day the woodruff key went on the flywheel. So I got a new one put it in and didn't start the saw for a while. Now it starts but is rough and backfires. I have put a new plug and coil on with no luck the spark looks weak. I'm stuck. Any ideas?

 

Either the flywheel hasn't been fitted correctly or the coil may have taken a heavy knock. I would take the flywheel off again and check the key is still OK .

 

The flywheel doesn't have two keyways does it?

 

The backfire is a sign that the ignition is very retarded and is ignighting on the downward stroke.

[13glen7]

I don't think it has 2 keyways but in a way I hope it does that would explain it. Would an ms880 flywheel fit it I can try one to test it.

[Stubby]

The flywheel magnets could be tiered .

[spudulike]

I don't think it has 2 keyways but in a way I hope it does that would explain it. Would an ms880 flywheel fit it I can try one to test it.

 

Take the flywheel off, check the key in the crank and the flywheel for slot damage. Check it only has one slot (think it was the 084 that had two at one stage) theme sure the cool to flywheel gap is correct

[13glen7]

Looked again today the woodruff key was broken again so got a new. The spark looks better and it will start after quite a few pulls and will run full revs (not perfect) but won't run less than half throttle it just dies.

[13glen7]

Checked coil gap and its good. only one slot and i cant see any damage.

[spudulike]

Looked again today the woodruff key was broken again so got a new. The spark looks better and it will start after quite a few pulls and will run full revs (not perfect) but won't run less than half throttle it just dies.

 

It is probably a fuel system fault if the flywheel and key (told you so) is now OK.

 

Check the fuel line is ok and the carb internal gauze filter, they will be the common issues.

[Logrod]

Out of interest what causes the woodruff key to go in the first place?