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Tune Kits > FWB 150-300 Custom Spring
FWB 150-300 Custom Spring

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Price: $25.00
Availability: Sorry, Sold Out.
Prod. Code: 300-150K


New 6-28-21

Arctic  custom mainspring- tighter fit- smoother performance. 

Replaces the two spring setup to one on the later 300S models

31 coils x .1065 wire. 



Please do not email about higher power kits-springs as that tune was not drop in parts or a spring and was discontinued more than 30 years ago.