Stihl MS230

[Goball]

Due to health and other reasons, I though I was pretty much out of the chainsaw business but a close friend showed up with his MS230 that he's very happy with. It not a reliable starter which surprises me but agreed to have a look at it. Initially it started and ran pretty well but when left a few days, it wouldn't start. I had a look at the carburetor, a Zama S76B 943A type. Looked like the metering valve system was in reasonable condition and the diaphragms OK but afer many attempts to start/run, it continually spits gas back through the carb inlet. Adjustment of the H&L screws doesn't seem to make any difference. Tried adjusting the metering valve adjustment but that didn't help at all. I'd appreciate any suggestions you might have. Thanks.

 

[HarleyT]

Sounds like it may just be a leaky needle, but instead of bothering with messing with the carb, just pop on a new one. As the carb kit is @ $19.


1123 120 0603 CARBURETOR (MS250) 21.99

These prices are at the Stihl dealer.

Take a close look at the fuel line, they are known for cracks.

 

[Goball]

Replaced the carb kit and saw started right away. Brother took it back and worked it for a while then after shutting off, it wouldn't start again until it had cooled off. His second saw, also an MS230 acts the same way. I looked at it, adjusted the carb a bit and it started right away when cold but also would not start again until it had cooled off. This makes me think the there might be a design issue here. Has anyone had similar problems? Suggested he let the saws idle to cool down for a short time after working it hard but won't know the result of this idea for a while.

 

[rd35]

Last time I had a problem where a saw would start when cold and not start when hot....turned out to be a dying spark plug. I had chased what I "thought" was a fuel problem for days. A new spark plug fixed it! Just a thought!