Hi.. Just a few points. I have been dealing in Engines since the early 70's. I have sold, rebuilt, repaired all sorts of Gas, Propane, and Diesel engines. European, Asian, American. Honda, Kaw, BMW, Kohler, Onan, Wisconsin Robin, Briggs, Tech, and on and on. I have run and tested all sorts. We at DAX have been in Business for over 26 years. We have been here for a long time. All that is in the past.. Here is the Current and latest. The Titan XC50 is a 49cc 4 stroke motor. Approximately. I will put it up against any other 50cc 4 stroke made. Any.. Honda, KAW, Yamaha. Any.. It is that good. I know my engines. I have a Honda GXH50. I also have Titans. I know what I am talking about here. In many ways, the Titan is superior since it fits the bicycle applications much better. The GXH requires a clutch pack to be purchased in addition to the motor. Also the clutch pack for the GXH is cumbersome and requires a totally different setup. It just is not as lean and for the applications we run, not the best choice. That is why, working with S H Factory, we have chosen the motor we have and called Titan. So far, in the past 2 years of Selling Titan, we have had 3 failures. 1 was due to a gear box failure and as a consequence took the motor out. The other 2 were due to noobies failure to put oil into the crankcase. You do ship these with oil in them.. right? answer is.. No.. We do not ship them with oil in the crankcase. Each engine is factory run and tested. Oil is drained and then shipped. That explains why you got 2 hours of run time before the motor seized.. I must admit.. I was amazed that these customers got over 2 hrs of run time with no oil in the crank case. Amazing !! I figured you would get 2 mins. Not 2 hours. Are they telling me right? Probably not..I have never run a motor with no oil in the gas or in the crank case. Never. I did install crank bearing incorrectly one time, I did not line the oil hole up properly. It ran for a few mins.. And then... slowed.. And then.. Froze.. . At any rate. After admitting they thought the engines were shipped with oil in them, and then told no. Well.. They of coruse feel bad, and then I feel bad too since it is their first 4 stroke motor or first motor ever, and they made such a bad mistake. Ok..Long on wind here. Forgive me. But.. My point being, The Titan is a solid , very solid, engine that is making a name for itself. Those that compare it with Honda GXH are making good comparisons. The Honda is a wonderful Engine. Just wonderful.. So is the Titan.. Just superb.. Did you know that the Honda GXH50 is made in China? It has been for several years now... anyway....In the Future, I may swap some parts from my Honda to Titan and see what all is interchangeable and works well. I know that many Honda Owners use Titan Carbs with great Results. I am sure there are other parts than can be swapped as well. I can tell you this. We test. Extensively. And once our Engineers are convinced we have a superior product, then we will sell it. ........ Enjoy the ride...