another spring question

i have a 2012 yz450f with a 5.4kg rear spring that beats me to death on rough tracks. the free sag with this spring is 42mm and race sag is 99mm. will a 5.3kg spring get me to 30 to 35mm free sag and smooth things out or should i go with a 5.2 spring. almost forgot i weigh between 155 and 160lbs depending on the day (without gear).

Put the stock spring back on. You've got too much preload on the spring.

Put the stock spring back on. You've got too much preload on the spring.

Explain

i have a 2012 yz450f with a 5.4kg rear spring that beats me to death on rough tracks. the free sag with this spring is 42mm and race sag is 99mm. will a 5.3kg spring get me to 30 to 35mm free sag and smooth things out or should i go with a 5.2 spring.

Either a 5.2 or a 5.3 should be right. The 5.3 might not get you the sag reading you want, but it will be closer than what you currently have. If you're a fast MX type, choose the stiffer one of the two. If the bike is beating you up, spring rates might not be your only problem.

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