025 will not start when hot

[NHWoodsman]

I thought I would post my 025 problem - and see if anybody has any ideas as to why my "025" will never start when it's hot. The saw starts fine (2-4 pulls) when it's cold, but if I shut it off after it has been running, or it runs out of fuel - I can almost never get it started again - until it has time to cool down. When it's running, it runs fine, smooth and with full power. It's a great saw - except for this problem. If I've shut the saw off myself, and then immediately tried restarting with the choke in the run position - doesn't work. I've tried same scenario other times with partial or full choke to see if that makes a difference - doesn't work. No choke position helps when it is hot. Let it cool down - starts up with 2-4 pulls. Anybody have any ideas? I've gotten poor service on my other saw (028) by both of the local Stihl dealers - so I'm trying to figure this one out myself. Thanks in advance for any help or suggestions.

 

[Kneejerk Bombas]

Figure out if it's electrical or fuel.
Once it's hot, shut her down, see that it doesn't start, then quick check the plug for spark. Report back.

 

[chuckiehow]

I fought with an 025 with similar symptoms and even changed out the coil / plugwire combo and switched to a good carburetor with no results. The minute I changed the sparkplug my troubles were over. For whatever reason, a hot plug doesn't perform the same as a cold one in my opinion. Make sure it's the right plug for the saw also. I'm betting it's the plug.
Beware: The plug wire end is easy to damage in the process.

Meanwhile back at the ranch, I'm still struggling with my own 025 that now has a good carburetor on it but still insists to idle rough and die when not in a cut. Seventy miles down the road is a Stihl dealer with a new fuel line and a Walmart store. I'm sure the wife will love to ride along.

 

[Hard Knocks]

First thing that I would do is pull the muffler and check the piston!

 

[Griffbm3]

I'm with Hard Knocks

Mine was a burnt up piston in its infancy. Luckily I was able to change out the piston before it scored the heck out of the cylinder. Once a new piston was in, along with a new gasket set, the saw has always started cold/hot every time. I also run only High Test (93 Octane), but that subject has been beaten around here enough. Seems to start a lot better now though. Hope this helps, good Luck.

Jason

 

[Bermie]

For what its worth...
My 021 had similar symptoms, and got worse after I took it to the shop! I had thoughts of major problems and put it away.
After I came back from an extended course that included tuning carburettors, I retuned the saw myself and it has never looked back. I had bought a carb repair kit, but didn't need it, I set the jets/settings to factory then adjusted high and low as per instructions. Bbrrmmm brrrmmm.....

 

[SawTroll]

That whole series of saw are POS, just admit it........

..at least that was what my Husky tech told me today......:biggrinbounce2: :biggrinbounce2:

 

[Hard Knocks]

That whole series of saw are POS, just admit it........

..at least that was what my Husky tech told me today......:biggrinbounce2: :biggrinbounce2:

:hmm3grin2orange: :hmm3grin2orange: :hmm3grin2orange:

 

[stihl025]

If I've shut the saw off myself, and then immediately tried restarting with the choke in the run position - doesn't work. I've tried same scenario other times with partial or full choke to see if that makes a difference - doesn't work. No choke position helps when it is hot. Let it cool down - starts up with 2-4 pulls. Anybody have any ideas? I've gotten poor service on my other saw (028) by both of the local Stihl dealers - so I'm trying to figure this one out myself. Thanks in advance for any help or suggestions.

Replace the plug with a brand new Bosch. If the plug doesn't solve the problem, re-adjust the carb back to the factory settings (out 1 full turn from seat).

See if that helps. Using ANY choke setting after the saw is hot will flood the saw for some reason. If your saw is an older 025, just do yourself a favor and go and buy a carb kit ($8). It may save you some trouble. Mine was stalling when I picked it up off of the ground. It would run fine, but the upward force would stall it. Found some bad gaskets in the carb and it now runs like new.

I agree with Chuckiehow, I think it could be the plug. When was the last time it got changed? What brand?

I also agree with the others, pull the muffler and check the piston anyway. Safe than sorry...

 

[troutfisher]

That whole series of saw are POS, just admit it........

..at least that was what my Husky tech told me today......:biggrinbounce2: :biggrinbounce2:

 

[NHWoodsman]

Thanks so far!

Guys - thanks so far for all the advice. I think the first thing I'll try (this weekend) is what Mike Maas and others have suggested, and go after the spark plug. If that doesn't work, I'll pull the muffler and check the piston. I know the "025" isn't a real man's saw - but I picked it up for $100 from an elderly retiring homeowner, and the saw was in near mint condition. It was only intended to be used as a "backup" to my old "028" Woodboss, but has seen more service than I originally planned - that's why I would like to get the starting issue resolved. Thanks again so far - I'll update the thread next week with the spark plug results.

 

[NHWoodsman]

Great News - 025 now starting when hot!

I have great news - my 025 is now starting when hot. It appears that the problem (or most of the problem) has been resolved by changing the sparkplug. In my last thread I said that I would start by going after the plug. When I pulled the plug - what I found was an "Autolite #2984". I bought this saw used, and have never checked the plug - so I don't know if the original owner, or someone who serviced his saw decided to use this plug. When I saw the plug, I went to the local Stihl dealer and they sold me a Bosch "WSR6F" - which they said is the correct (Bosch) plug for the "025". The saw hadn't been run for a month, but started after 3-4 pulls with the new plug, and ran fine. I used the saw for 20-25 minutes until I considered it was good and hot, and then shut if off. I moved the choke lever back to the normal run position, and for the first time EVER - the saw started on the FIRST pull. I couldn't believe it! I repeated this several times, and the saw always started (hot) on the first pull. I want to thank all of you guys for your help. If it hadn't been the plug, I'm sure that one of the other suggestions would have fixed the problem. I really appreciate all the help. -NHWoodsman

 

[Dan Forsh]

And they all lived happily ever after....​

THE END​

 

[stihl025]

Awesome

 

[chuckiehow]

Thanks for reporting back with your success.