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I had a similar problem happen on my MS170 baby saw. For me, it was the carb - needed to be disassembled and cleaned out. The saw Would idle very low to the point of dying but if I turn it on either side or upside down, it would idle high. In case your fuel lines and boots look good, might...

There are a couple of MS661 Arctics available for purchase on ebay. From Canada, of course.

Hey StanMan, bummer to hear of your issue. Can you describe the problem in more detail? You mentioned that it "fires" but it does "not attempt to run". If you have these going then it should run or attempt to run for a short moment: 1. Spark with the correct timing 2. Fuel with acceptable...

Seconding what @wcorey mentioned - you can go up to 50mm piston/cyl. or 52mm piston/cyl (displacement of the 038 Magnum ~ 72cc) with some minor modifications. Depending on what you're going to use it for, might be worth the upgrade in size now since you've got the thing apart and piston cylinder...

Following up on my last post. Here are two videos I took of my MS661 connected to a scope. First run on scope: Second run on scope recorder: My initial thoughts is that the signal is not a communication protocol. I have read others mention LIN Bus but this is not the case when it's...

I have a 661 with the older version of Mtronic (not v3.0). It seems to run consistently - always starts in 1-2 pulls cold, 1 pull hot. I also have an 038 Magnum. The 038 I can definitely attribute to a classic carbureted car that's easy to work on, easy to adjust, easy to get the job done. The...

Further thoughts. Mtronic might be able to "guess" load and use this fuzzy logic to optimize fuel metering and timing. Since in the world of chainsaws, you either go zero throttle or WOT, perhaps Mtronic assumes WOT if the RPM increases above a certain threshold assuming that the start/choke...

This thread is so interesting to me that I signed up and this is my first post on this forum. I have an MS661 and have been studying the Mtronic system quite a bit. I am intrigued by what @breese has been finding out on his 261. I found it to be remarkable that the ECU is able to extrapolate...