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Post by pafire on Nov 11, 2008 18:14:48 GMT -5
I have recently acquired this saw and what do I need to check on this saw. It seems to have good compression and after pulling the muffler there is no scoring on the piston or cylinder. I have tried to clean-up the points, but still no spark. Just need to give this saw some spark to run. Anyone have any ideas on this saw.
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Post by lawnmowertech37 on Nov 11, 2008 19:27:49 GMT -5
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Post by lesorubcheek on Nov 11, 2008 21:28:34 GMT -5
Do ya have a multi-meter? If so, you can test the coil and with a capacitance tester you can check the condensor too. Also, as is said many times on these forums, start with a good new spark plug.
Dan
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Post by pafire on Nov 13, 2008 10:01:01 GMT -5
Why yes I have a multimeter, how do i check the coil. points,and switch. I will have to find someone with a tester to check the capacitorand see if it is working.
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Post by chainsawwhisperer on Nov 13, 2008 19:57:36 GMT -5
To test the coil, Measure between the positive and the negative wires(primary winding), you should get a low reading 4-9 ohm. then measure from the high tension tower (secondary winding) to either ground or the primary side windings (I can't remember which one or both), but what your looking for is a high (over 20k). Let us know what the values are. CSW
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Post by lesorubcheek on Nov 13, 2008 19:58:51 GMT -5
I tried to take a few pics that hopefully will help. Sorry, but the lighting isn't great and ya know how most digital cameras are indoors with poor lighting. Anyways, here's the assemble with the coil and condesor wires removed from the terminal block with a meter attached. First, here's a reading of the primary coil. The ground is the bare wires going to the main hoising and the primary lead is the one removed from the terminal block from the coil. The reading is 1.3 ohms. Next is the secondary or high tension coil. Ground is same as previous and the lead going to the sparkplug is the other end. It has a reading of a little over 5k ohms. Last is a reading of the condensor. Common ground as before and the end of the wire where removed from the terminal block for the other side. It has a reading of 2.1 uf. To check the points, simply look for continuity between the terminal block where they're attached and ground when closed. Should a reading low reading very near 0 ohms. If there's more than 4 or 5 ohms when closed you may wanna check and see if they're pitted and need filing. The ignition switch should be a closed circuit with a very low resistance in the OFF position and an open circuit with infinite resistance in the ON position. Hope this helps. Dan
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Post by MCS on Nov 16, 2008 22:47:14 GMT -5
pafire, Have you read my tutorial on magneto ignition systems? It will give you some fundamentals. That and the posts from the others should get you started.
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