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You are here: Home / Automotive & Mechanical / Stihl MS 250 Chainsaw Engine Bogging Down

Stihl MS 250 Chainsaw Engine Bogging Down

February 24, 2013

This started happening towards the end of last Summer. My Stihl MS 250 chainsaw engine would bog down at the strangest times. I can’t say there was one time in particular, but I guess mostly when I put the saw under a load. When I started cutting with it, it would bog down and then I would stop and rev the engine. I would get it going again and the same thing would happen. Since it was the end of the season, I put the saw in the garage and hoped it would heal itself by Spring.

Well, I had to use the chainsaw the other day. Guess what? It had the same problem. My sharp senses told me what the problem was. For some reason, I knew I had to clean and re-gap the spark plug.

When I took the spark plug out of the engine, I took a glance at the gap. The side electrode and the center electrode seemed to be pretty close together. Since I had absolutely no idea what the gap is supposed to be for a Stihl MS250 chainsaw, I looked it up. I found out that the spark plug gap is supposed to be .020 or 0.5mm metric for the Stihl MS 250 Chainsaw. Yep, I was right. When I measured the gap with my spark plug gapper, it was too small.

Now, .020 gap is pretty tight. It’s actually the smallest size on my gapper. Good thing too. I re-gapped the spark plug and gave it a quick cleaning. Then, I reinstalled it in the chainsaw. I started it up and problem solved. I love it when a plan comes together. Now, the saw is nice and strong when I cut through wood.

Stihl MS250 Chainsaw

Stihl MS250 Chainsaw Side View with Pull Start

PS – I wanted to write a quick note about trying to diagnose small engines. For some reason, people seem to love jumping into the fuel system. I am not sure why this is, when the easiest thing to check is the spark plug. Take out the plug, clean it, re-gap it and see how that works. Don’t take out the carburetor and rebuild it if you don’t need to. Most of the time, this is unnecessary.

Related posts:

  1. Replacing Starter Rope on Stihl MS 250 Chainsaw
  2. Briggs & Stratton Lawn Mower Engine Tune Up
  3. Calling the Car Dealer
  4. Stihl BR 550 Backpack Blower
  5. 351 Cleveland Engine Block – Ford Mustang Mach 1

Filed Under: Automotive & Mechanical

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