22-06-14, 05:31 PM
Ive experienced this dirty brown coolant in one or two bikes. Your flushing of the system will have dislodged bits of scale,rust etc. The modern OAT type coolant seems to be a vast improvement on some of the old ethylene glycol brands. You bike will thank you for it! Just watch your hoses & hoseclips if they are original as even the youngest FZS 600s are 11 years old .

