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RM85 all the way, has a power valve, case mounted reeds, enogh low end to get ya goin and enough top to be a bat out of hell, i ride only woods on mine and have ZERO problems and its geared 3 teeth higher on the rear (takes from low end) so if it was geared stock im sure it would pull GREAT on low end. the KX100 sounds good but its not near as snappy as an 85, according to eric gorr you should ad an FMF exuast and porting to a KX100 to make it better, then only "bad" on the rm is that the fork oil wears quickly and the water pump impellor is made from plastic so if your hard as crap on it it can melt but iv never had a problem but if you wanted to you could put a boyesen super cooler on (about $200) and the impellor is aluminum plus it comes with a bigger water pump cover for better cooling. my vote: RM85 FTW!!!!
RM85 all the way, has a power valve, case mounted reeds, enogh low end to get ya goin and enough top to be a bat out of hell, i ride only woods on mine and have ZERO problems and its geared 3 teeth higher on the rear (takes from low end) so if it was geared stock im sure it would pull GREAT on low end.
the KX100 sounds good but its not near as snappy as an 85, according to eric gorr you should ad an FMF exuast and porting to a KX100 to make it better, then only "bad" on the rm is that the fork oil wears quickly and the water pump impellor is made from plastic so if your hard as crap on it it can melt but iv never had a problem but if you wanted to you could put a boyesen super cooler on (about $200) and the impellor is aluminum plus it comes with a bigger water pump cover for better cooling.
my vote: RM85 FTW!!!!