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[QUOTE="robwbright, post: 1082762, member: 60515"]
Had it done over the winter.  No issues at all thus far.  The 144 piston weighs about 1/2 an ounce more than the stock 125 piston, so there's very little extra weight to put stress on the bottom end.

I haven't replaced either the ring or the piston yet.  Iwas going to ring it last week, but everything checked out ok, so . . .  The motor has approximately 15 race motos, 6-8 practices and 10-15 other hours of play riding/practice on it.

Dirtrider.net member "bclapham" also had a 2002 RM144.  If I recall, he was 200+ lbs and racing at very hilly Glen Helen.  If I recall, he replaced the ring every 5 races and the piston every 10.  He replaced the crank at one and one half seasons.

Eric Gorr recommends 5 hours for rings and 10 hours for pistons for non-expert riders.  (Note:  That's actual ride time - in a typical 2 or 3 hour "ride" I find I'm actually on the bike for maybe an hour.)   Eric's recommendations are just that - recommendations.  He's seen an expert blow a 144 motor in an hour, and he had a 144 go 100 hours on the same piston.

It's all in how you ride it.  Use a good 2 stroke oil (Eric recommended Mobil1 Racing 2T) and you should be good to go for quite awhile.
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