If you dont they will give you some line how the uni caused the damage.Its a pain,but it will save you a ton of cash.I think if those threads are bad they have to replace the crank.If i,m right you might what to pull the spring because they may just replace the motor.
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 04 yerf 3206
rag top 
uni filter
redneck intake
125 jet
16.5x6.5x8 fronts
21x11x10 holeshots on itp's
coming soon 10g roller 1500rpm spring
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