Service & Maintenance Question
Hello, I recently purchased a 150BT used. Do you know what...
Service & Maintenance Question posted November 16, 2014 by kelly wolford
375 Views, 4 Comments
Question:
Hello, I recently purchased a 150BT used. Do you know what the resistance is on the coil unit b4 I deam it bad? The unit is in good shape. I did a full tune up upon purchase. All Husq OEM parts. husq oil and high test non ethanol fuel. Ran the unit for about 4 hours (non continuous) and now when warm is develops a pretty healthy skip. tested kill switch (good), no intake or exhaust restrictions,compression primary and secondary in spec, carb clean, fuel filter clean, unit is developing weak spark, coil gap is good.
Details:
The unit is in good shape. I did a full tune up upon purchase. All Husq OEM parts. husq oil and high test non ethanol fuel. Ran the unit for about 4 hours (non continuous) and now when warm is develops a pretty healthy skip. tested kill switch (good), no intake or exhaust restrictions,compression primary and secondary in spec, carb clean, fuel filter clean, unit is developing weak spark, coil gap is good.
Answer
First I would try another known good plug and double check the carburetor fuel mixture settings. Spark plug are to no bad at anytime and cause strange problems; even brand new plug can be bad right out of the box.The only real coil resistance that you can measure is the primary which doesn't give any info on the condition of the electronics or the secondary side.
When it comes possible ignition coil problems and you have checked all of the other possibles you just have to bite the bullet as the saying goes and try another coil. I had a Homelite chainsaw a few years ago that run fine most times but would occasionally backfire thru the carburetor. It turn out to be the timing advance circuit in the coil that was failing. A new coil solved the problem.
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Hello Eugene, thank you for the quick response. I took your advise and purchased several plugs. gaped to spec and the same result with all three. I pulled the trigger and ordered a coil. Installed OEM coil assy. and the issue is WAYYYYY less but at full throttle i still have a whisper of a miss. You notice a bit of a viberation that comes in and out. No knocking noise as before or rough idle. The carb acts like it needs adjusted, but on this model there are no mixture screws to adjust. Thoughts?
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Other than checking for intake air leaks this includes the crank seals and the cylinder jug gasket (sometime it is just loose jug bolts), there is not much can be done. There is a hidden idle mixture adjustment but there is no high adjustment.
BTW I hate non-adjustable carbs.
The Walbro WYA series service manual /pdf/media/21910/WYAseries.pdf
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Hello Eugene, I followed your lead, checked all bolts and inspected for cracks and leaks. Checked primary and secondary compression once again all passed with flying colors! Thanks for the Walbro manual! I pulled the carb down totaly gutted cleaned set all the meter valve heighths. Got the unit all back together and it is running BETTER THAN NEW! Thanks a ton for your time and help! Husq ROCKS!
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