On a real car, if you have something covered by warranty wear out due to normal wear and tear, within the warranty period, they will replace it. That is what a warranty is.

"My car has 150,000 miles should I ask for a free paint job?" If paint was covered by the warranty and the warranty was still valid, why wouldn't you?

Do you KNOW that duratrax won't replace a regularly worn piston and sleeve within their 2 year warranty period? Just because you THINK that they won't, doesn't mean that they won't. You probably shouldn't try and discourage someone from trying to get this done under warranty either. You may be costing them money because of what you THINK.

Maybe duratrax knows something you don't. Maybe they did intend to warranty their engine for 2 years against normal wear and tear. Maybe they believe that the extra sales gained through having a nice warranty on engine life outweighs the cost of replacing a piston and sleeve here and there. Maybe they bank on lots of people not getting 5 gallons thru the engine in 2 years. Lots of folks will also replace the engine rather than rebuild it. Many people will not bother to use the warranty and just replace it themself. Many people will be told in online forums that the warranty doesn't apply to them because it's normal wear and tear.

I don't know if this is the case, but if my engine goes south within the two year warranty period, you can bet I'll be contacting duratrax's warranty department before i spend any money.