I purchased a Troy Bilt with the Honda engine last year at Lowe's. Not self propelled, 21 inch cut, with the Honda 160 cc engine and automatic choke. Reading on other forums, it appears that the Honda 160 cc engine equipped with the automatic choke should be avoided. I wish I had done my homework before making the purchase.
My unit has never, not once in it's life, started on the first pull when cold. And the engine "surges" (RPMs go up and down when not under a load). It has done this since day one. Finally, after 10 months, I decided to take it in while it was still under warranty. I returned it to the Lowe's store where I purchased it. I had my original receipt, which included a 3 year EPP (extended protection plan).
Lowe's wanted me to sign a paper saying that I would be responsible for paying for the repairs. I refused, they called a manager, who told me that if I were charged for the repairs he would give me a new lawn mower instead.
Fast forward 2 weeks, and Lowe's wants $75 for the repairs, and they claim never to have made me any promises about paying for the repairs. I would seriously advise anyone reading this to avoid Lowe's and avoid the Honda 160cc engine equipped with the automatic choke.