pickled up an 025 on ebay.The saw was not fireing.replaced the coil and am getting fire now.saw will not run.Does not fire spraying mixed gas or starting fluid directly in the carb.Changed fuel line and filter,carb,changed plug multiple times,coil gap I used a business card.Did a leak and vacume test appears ok.Tried to do a compression test but gauge screws in to far.Holding rope and dropping saw spears ok.Piston looks good through he muffler port (help)
025 won't run. help
- Thread starter chris ham
- Start date
Help Support Arborist Forum:
Just finished an MS250 and it wants to flood for unknown reasons. I can get it to idle fairly well, but the idle jet has to be turned in to about 1/4 turn from seated. I've checked all the usual suspects and am still hunting. I've heard that these saws have a tendency toward flooding. Was your spark plug wet when you changed it? If so, check the causes of too much fuel/ too little air.
I changed the plug so many times I do not know if it was wet or not.I probably did flood it as long as I messed with it.Can't you unfold one by unhooking the gas line and pulling the cord.I also sprayed compressed air in it through the muffler port.I figured out my compression gauge you can unscrew the tip and it gives you shorter threads.Compression was 130 AND 135 psi.I also have a 021 that runs good.I CHECKED IT AND IT WAS 135.
Try removing the plug, turning the saw over so the plug hole is down, then pulling the cord several times to see if fuel drips out.
The only my 250 will start is to stick oxy-acy. torch in plug hole to warm up cylinder real good then heat plug with torch then quickly slap back together before it cools down!!---USUALLY this works the first or second try, but have had to go 3 times and then you are ready to cut, stop and start all day,---just dont let it cool down too long! thanks; sonny580
I hope i dont have to use the torch method would be a lot of trouble.The 021 is basically the same and runs like a top.I'm trying to upgrade my saw arsenal.Got ready to cut wood awhile back and was down to zero.Currently I have an 029,021,husky 240 running.Rebuilding an 039,Trying to fix an 021
Most of the little Stihl saws I've worked on would benefit from having a new carburetor. You can also purchase a new ignition module for those for cheap and don't forget to check the flywheel key.
- Joined
- Dec 6, 2014
- Messages
- 21,164
- Reaction score
- 25,016
Likely it would also be beneficial to have a new saw.
There are a few parts that the 025 usually don't need.
put an aftermarket coil and carb on it new.Took the aftermarket carb off and put a kit in The stihl .Still will not run.Getting fire to the plug.Spraying gas in the carb.Will not even act like it wants to run.Acts like it is flooded or not getting spark.I know the plug is firing
- Joined
- Dec 6, 2014
- Messages
- 21,164
- Reaction score
- 25,016
Yeah, definitely check your flywheel key.
Sounds cooked. Check compression with a guage not your opinion or feel. They don't all score where you ccan see it through the exhaust. Mike
So many 025/250 issues. I feel they are on the cusp of a homeowner saw wanting to be a pro saw and just can't quite make that transition.
I say they are on the cusp of being a homeowner saw or a throwaway saw. Nothing pro about them at all. Mike
dougand3
Addicted to ArboristSite
If you have fire and can't get a pop and 2 sec run with fuel in plug hole....gotta be 1. compression or 2. key sheared.
walterg
ArboristSite Operative
J.W Younger
ass kissing impaired
Have you tried starting it with the muffler removed?
