KDXRIDER.NET

I disagree with what your engine builder said but I'm open to being corrected, here.is what i think
Motorcross bikes use cast pistons, these are highly stressed engines that run flat out yet all manufacturers run cast pistons, the usual go to answer is cost savings but do people really think the manufacturers put the highest spec suspension and engine design only to save 50 dollars on a piston, that's not logical
All enduro 2 stroke bikes run cast pistons from OEM, now road racing guys will give there go to answers without mentioning the differences between road racing and enduro, with road racing it's much easier to keep the engine at a constant temperature due to airflow, with enduro we have no such luxury and engines will and do run to boiling point often , a forged piston run in an overheating engine will not have a good outcome
For the general public, bringing an engine up to operating temperature before riding is not always an option, as an example, I live right next to the freeway , from the time I leave my front yard to sitting at 8000rpm on the freeway is about a minute , again not great for forged pistons, I should add this is my cbr125 4 stroke not my kdx
The cast vs forged debate will always continue but to just say the words "forged is better" is not accurate, that's like saying 4 wheel drive is better, it means nothing if not put in to context

When I was younger I would always listen to what racers say and do and try to copy, as you get older you realise this makes no engineering sense and there are so many variables depending on environment

The internet is made up of majority younger inexperienced guys, the older experienced guys gave up trying to reason with the inexperienced long ago and as such knowledge is lost

kdxazz, certainly, do as you wish. I began using forged pistons in my own super-pumped, water-cooled, road racing twin after destroying many cast pistons. I never melted, cracked, or blew up another piston following this change. While my own road racing experience is just a pinpoint in time, my engine builder friend ruled several AFM classes for more than several continuous years. He also had some Superbike success, too.

Some and fewer and fewer motocross racers use cast pistons. Many new motocrossers come from factory with forged pistons. The more serious racers change them frequently. The less serious racers don't run the engines hard enough and frequently enough to need piston replacement. billie