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Sorry for the late reply on this, I've been away on vacation. Well you guys were correct on the coil, I ordered a factory replacement and it revs right up now. Carb needs a little adjustment for the high speed but not bad, it'll work fine the way it is. Hope this thread helps out somebody...

Thank you! I'll get one on order from one of these guys.

Thanks. Yes I did pull the flywheel and checked the key, everything was fine, the key was not damaged and was aligned in the keyway. Flywheel keyway was not damaged

I put it back together and tested the spark, visually. The spark is fat and purple. I used a rod in the plug wire grounded on the muffler. I didn't measure the gap but it was substantial. . I also tested the plug which is a new NGK grounded against the muffler and saw lots of spark, same...

Ebay and Amazon. Amazon came in a bag noting it was genuine OEM part for various trimmers marked on the bag, I don't have the bag any longer. No manufacturers name on the part but was stamped with the number 173.

OK, I'll check it again to make sure the spark is robust just to make sure.

Yes, I did adjust the high speed adjustment to see if it would make an improvement in performance, it did not. Actually I took it to the lawmower shop down town because I needed that special wrence and he tried to get it to rev adjusting the screw.

Haven’t checked crankcase seals but I can. Has great compression 120 psi. I could spray carb cleaner around carb and crankcase seals when running I guess to see if there’s any change. I put in a new plug the old one looked normal, grey / sandy color. After running it’s slightly black but not...

I pulled the flywheel, key is in the flywheel as it should and has not moved. Doesn’t look like there’s anything to this flywheel that could go bad, magnets seem pretty strong.

First replacement was an EBay and was marked 173 on the bottom, the second was OEM and came in a bag stating it was OEM for several models and makes and was also stamped 173. I’m thinking it came from MTD somehow.

Ok will do, never thought it could do that. Thanks

I have a TB20CS trimmer that suddenly just stopped the other day. I discovered there was no spark so I installed a new coil, gaped it with a business card and it started right up but it would not rev up at all. It'll idle perfectly but not high enough to trim. So I've done the following: 1...