so we went on this long trail ride today a lil over a 100 miles, and my buggy was running good and it started gettin late so we hit the blacktop to get home and i was rung about 50 in 4th not hardly cranking my motor ang and got allmost back to where we started and pop piston arm broke what could couse this at low rpms ?

What size motor, and what kind of rods, do you know what you compression ratio is, could have over heated.

well i tore the motor down today and it turns out it spun a rode bearing, it was just a 1641 pretty much stock and its been run for years lol thats the first thing that ive had happen to it motor wise lol

what is a good but affordabe brand of pistons and jugs ? ive got an old motor im gonna turn into a 1915

There are no more inexpensive choices anymore for larger pistons and cylinder kits. Shop around. It pays to shop.

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Buy the best and cry once.