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Message: [QUOTE="bclapham, post: 727759, member: 25565"] if the yz125 is good for you with a 4.6, then i would go for the 4.8 on the 250 since it is heavier bike- i would look for a 4.8 take off spring from ebay. i weigh 225lbs and the 5.6 is too stiff for me. if your brother is 170, i would keep the spring on there its got. set the sag with him on it to 100mm (get another friend to hold the bike steady so he can center his weight on the bike). then measure the free sag with out the rider- if it is less than 10-15mm then you probably need a stiffer spring. btw- check the linkage is good on these bikes- yamaha use some really crappy yellow rubber lubricant on the linkage bearings and its useless- i pulled all the needles out (28) pulled out the rubber and then repacked the needles back in the race with Belray waterproof grease. [/QUOTE]