It nothing else, the Kawasaki engine in the X354 is worlds better than the single cylinder B&S engine in the Troy Bilt. Those B&S engines are famous for blown head gaskets and broken automatic compression releases.
The only X500-series models with 1" (front) axles are the ones with power steering. All manual steering models have the same front axle diameter as the X300-series.My personal opinion is that it all comes down to trans axels, of which I've gone through three on one acre with a slight incline. 3xx series uses a K46, same as the 1xx series, and its proven too light duty for my small yard. Not my opinion, but a very expensive fact. Axels are 3/4" on 3xx series vs 1" on the 5xx series K72, and the whole tranny and axels weigh a mere 12 pounds on the 3xx. I had to bump up to a 500 series, not because I wanted to, but because I had to.
My mistake. I was speaking about transaxels and should have been more specific in my second sentence. TRANSAxels are 3/4" on 3xx series vs 1" on the 5xx series K72.The only X500-series models with 1" (front) axles are the ones with power steering. All manual steering models have the same front axle diameter as the X300-series.
As for the rear axles, everything from the original X500 to the newest X590 has the exact same rear axle size.
Speaking of rear axles, those beefy looking rear hubs on the X500-series are mainly for show. That hub with the fancy lug bolts is driven from the smooth transaxle shaft by a single square key, just like the 100-series machines. Disappointing, eh?
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Not all X3xx-series have 3/4-inch rear axles. True, the K46 has a 3/4-inch axle but on some models like the X380 and X390 they use a K58 transaxle which has a 1-inch axle.My mistake. I was speaking about transaxels and should have been more specific in my second sentence. TRANSAxels are 3/4" on 3xx series vs 1" on the 5xx series K72.