300 kM is not very much mileage. Unless they have been subjected to impact and damaged I would think they should be fine. Maybe send a inquiry to the manufacturer about lie time (as in years) before environmental degradation can cause problems.
I used to be fast....now I just dream about it.
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'08 910R (Gina), '04 F4 SPR #275 Track Bike (Lola), YSR50 (The Rabbit), '71 CB100 (Lil' Red), '75 RD350C (Orange Bird) restoration project, '70 Suzuki F50 (Baby Blue)