In August of 2008 I purchased a Ferris 3100 with a Kawasaki 37 HP engine, model FX1000V. I was looking at the Ferris website and discovered they no longer list it. I phoned the dealer and they said there had been some problems with them, specifically fuel injection and valves. I have a carburetor, so I don't care about the fuel injection, but do care about the valves. He said he would see if there were any upgrades my serial number would qualify for. Ignoring that, I don't want the engine to fail, as it would be expensive to replace. I found some posts here suggesting that they fail around 400 hours, or at least to two mentioned did. I am at 115 hours. The dealer said that Kawasaki was replacing heads, valves, and in some cases cams on engines, depending on serial numbers. I think I am the first of these engines this dealer sold, and it was pretty early in the availability of it. If they [Kawasaki] won't do anything, I consider maybe I should buy all the new parts [head and valves] and put them on to avoid catastrophic failure. I don't know what a replacement for this engine would cost, but I am sure it is substantial. The only odd symptom I have had is that occasionally I start it and it blows smoke for a while like the valve guides are bad. But, most of the time, it does not do that. What is current thinking on this engine in its presently marketed form? What advice would you have? It is a great machine and I would like to take care of it so it lasts a long time. I did buy into the extended warranty Kawasaki was offering at the time, which required you use their oil. I bought several cases of it and have been using it exclusively, as required by the warranty.