Howdy, Gentlemen:
Two years ago I purchased a Stihl MS250, used. It ran well the first year. Next year I had issues with it not wanting to start. I determined I was getting spark, so I disassembled the carburetor completely, and then used carb cleaner to clean out all the small passages in the carb. I used the Carb Cleaner's plastic straw to run pressurized cleaner through each and every passage.
I reassembled the carb, put the saw back together and ran it all of last winter.
I went to crank it in October(it was last used in April or May of this year). I drained out all of the old fuel, put new fuel in. Well, I pulled over on it cold start and it started and just barely ran for a few seconds and then shutoff.
Then, no matter what setting it was on, it seemed like it was flooding the saw's cylinder. I again pulled the carb, went through it, and reinstalled it. Still would not pop off in cold start or any other setting.
I checked the coil gap with a business card, cleaned the coil and connections, and reinstalled. I have even sourced another carb from Robsterdog on Ebay and tried installing it.
Just again tonight, I did the following:
Had let the saw sit for several hours, cleared it out via cranking without spark plug. Installed new spark plug, turned off all lights and then pulled over while grounding the saw. Saw the light from the spark, not brilliant lightning or anything, just a spark mind you. I got some scotchbrite and cleaned the coil, cleaned the flywheel surface with that. I then put everything back together.
I have the carb from Robsterdog installed- he has a good reputation and stated it was a good carb.
I put the saw in full choke setting, pulled twice on the handle with great force. No sound of ignition or popping off. Put saw on fast idle, tried one pull, no ignition, nada bupkiss. I tried it on the "run" position several pulls and still got nothing.
Let the saw clear out, removed plug to make sure it was cleared out by pulling over on it, and let it sit in a warm area of my garage for a few hours. I then put it in full choke and pulled twice. Put it it fast idle and pulled 3-4 times. Put it in main position. Nothing. No fire, no hint of combustion.
I also noticed it appeared that fuel was leaking out from the muffler/exhaust, after that attempt. The leak was profuse.
The saw is about 5 years old, no older than 6. It is a standard start model- it is NOT an EZ Start. It did not see much use until I got it, and then it has seen light duty use for small kindling cutting, branch trimming, etc.
I have resurrected 40 year old Blue Homelite's that have been trashed with less problems than this saw has given me.
Again, the following has been confirmed:
-coil cleaned and gap checked, cleaned all ground and wire connections
-new NGK plug, plug interchanges with Bosch WSR6F
-Verified that spark exists
-I know the engine is getting fuel, when pulling the plug after cranking, it is often a little wet.
-replaced the old carb with a known good carb.
-carb is the Zama unit with a limiter cap
-new air filter
-new line from tank vent to vent
-new fuel line and new strainer
-Non-ethanol 89 octane gasoline, 2cycle oil, mixed according to manual for 1 gallon
-Yes, I'm pulling hard enough. I have several of huge, high compression Homelites with no compression releases that can be very cold collared and my 250lb frame hasn't had problems cranking those
-I am using the standard procedure for 2 stroke starting
Any thoughts on where to go from here, other than the standard Internet responses like "Send it me, a-yhull-yhull-yhull" and "Burn it to the ground" ?
I really appreciate your responses(even "send it to me" and "Burn that M*******ker down") and I thank you for reading.
Two years ago I purchased a Stihl MS250, used. It ran well the first year. Next year I had issues with it not wanting to start. I determined I was getting spark, so I disassembled the carburetor completely, and then used carb cleaner to clean out all the small passages in the carb. I used the Carb Cleaner's plastic straw to run pressurized cleaner through each and every passage.
I reassembled the carb, put the saw back together and ran it all of last winter.
I went to crank it in October(it was last used in April or May of this year). I drained out all of the old fuel, put new fuel in. Well, I pulled over on it cold start and it started and just barely ran for a few seconds and then shutoff.
Then, no matter what setting it was on, it seemed like it was flooding the saw's cylinder. I again pulled the carb, went through it, and reinstalled it. Still would not pop off in cold start or any other setting.
I checked the coil gap with a business card, cleaned the coil and connections, and reinstalled. I have even sourced another carb from Robsterdog on Ebay and tried installing it.
Just again tonight, I did the following:
Had let the saw sit for several hours, cleared it out via cranking without spark plug. Installed new spark plug, turned off all lights and then pulled over while grounding the saw. Saw the light from the spark, not brilliant lightning or anything, just a spark mind you. I got some scotchbrite and cleaned the coil, cleaned the flywheel surface with that. I then put everything back together.
I have the carb from Robsterdog installed- he has a good reputation and stated it was a good carb.
I put the saw in full choke setting, pulled twice on the handle with great force. No sound of ignition or popping off. Put saw on fast idle, tried one pull, no ignition, nada bupkiss. I tried it on the "run" position several pulls and still got nothing.
Let the saw clear out, removed plug to make sure it was cleared out by pulling over on it, and let it sit in a warm area of my garage for a few hours. I then put it in full choke and pulled twice. Put it it fast idle and pulled 3-4 times. Put it in main position. Nothing. No fire, no hint of combustion.
I also noticed it appeared that fuel was leaking out from the muffler/exhaust, after that attempt. The leak was profuse.
The saw is about 5 years old, no older than 6. It is a standard start model- it is NOT an EZ Start. It did not see much use until I got it, and then it has seen light duty use for small kindling cutting, branch trimming, etc.
I have resurrected 40 year old Blue Homelite's that have been trashed with less problems than this saw has given me.
Again, the following has been confirmed:
-coil cleaned and gap checked, cleaned all ground and wire connections
-new NGK plug, plug interchanges with Bosch WSR6F
-Verified that spark exists
-I know the engine is getting fuel, when pulling the plug after cranking, it is often a little wet.
-replaced the old carb with a known good carb.
-carb is the Zama unit with a limiter cap
-new air filter
-new line from tank vent to vent
-new fuel line and new strainer
-Non-ethanol 89 octane gasoline, 2cycle oil, mixed according to manual for 1 gallon
-Yes, I'm pulling hard enough. I have several of huge, high compression Homelites with no compression releases that can be very cold collared and my 250lb frame hasn't had problems cranking those
-I am using the standard procedure for 2 stroke starting
Any thoughts on where to go from here, other than the standard Internet responses like "Send it me, a-yhull-yhull-yhull" and "Burn it to the ground" ?
I really appreciate your responses(even "send it to me" and "Burn that M*******ker down") and I thank you for reading.
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