Stihl 029 cutting out...

[tstex]

Hello to all and Merry CHRISTmas.

I have 4 chainsaws and my 029 [not MS290] starting cutting out on me yesterday.

First emptied out all the old fuel and fed her 93 octane w premium echo mix. Ran this fuel in 2 others [MS290, HT-101 pole] and they have been performing perfect.

Once I start her up, she runs fine for about 1-2 mins, then just dies. I then would restart and she'd run again but I had to keep throttle wide open, but would eventually die again in 45-60 secs. Then 2-3 mins later, I could start her at idle, but applying any throttle she'd immediately cut out. This happened 2-3 times in a row after repeatedly starting her so I just shut her down...also, the air-filter is not bad at all.

Do these symptoms provide any sure-fire cause/problem(s)? If so, what would you recommend as a solution? Also, I can engage in any add'l troubleshooting, but will have to wait until this friday when I go back to farm.

Thank you in-advance and immensely appreciate your help and suggestions.

Best,
tstex

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[MapleLeafFarmer]

might be the ignition module going bad.

 

[tstex]

might be the ignition module going bad.

Thanks- is there a way to isolate or test this?

 

[MapleLeafFarmer]

fairly easy to test.
test by checking resistance with a multi-meter.
primary resistance s/b in the 1-2 ohms range and secondary resistance s/b about 5,000 ohms.
I can't confirm this number as I don't have a manual handy.

youtube has a lot of videos showing how to make these simple tests.

 

[tstex]

fairly easy to test.
test by checking resistance with a multi-meter.
primary resistance s/b in the 1-2 ohms range and secondary resistance s/b about 5,000 ohms.
I can't confirm this number as I don't have a manual handy.

youtube has a lot of videos showing how to make these simple tests.

Thank you for clarification !

 

[Snobdds]

if you find the coil is bad, bake it in the over around 250 for an hour.

The theory is the solder joints in the coil break and the heat allows for the solder to get liquid and reweld itself to the coil.

 

[tstex]

if you find the coil is bad, bake it in the over around 250 for an hour.

The theory is the solder joints in the coil break and the heat allows for the solder to get liquid and reweld itself to the coil.

Thanks, great tip !

 

[nyone]

I would suspect a fuel issue. Possibly even a vapor lock in the fuel tank. When it shuts off try cracking the fuel cap, see if its sucking air in then start it again.

 

[tstex]

I would suspect a fuel issue. Possibly even a vapor lock in the fuel tank. When it shuts off try cracking the fuel cap, see if its sucking air in then start it again.

Thank you...I will try that early tomorrow morning...did you happen to see the youtube video where the guy does that, then checks the vent device connected to the tube that traverses the carb? I was going to pull it and clean it as specified...again, appreciate your post.

 

[newbury]

Another thing to check would be the fuel line. One of my 660's has similar symptoms - runs for a bit then dies. Frustrating but I've got other saws and just have not gotten around to replacing the line and I'm too cheap to take it in to get fixed.