Welcome thread
Hi.
I've just got a wee Yamaha125 to pootle about on which came with an arrow exhaust. All I did was to add a K&N filter which gives it that bit extra oomph (and doesn't seem to have affected the mixture). Otherwise its stock standard. There's some serious stuff you can do to them, but mostly thats not for me. I would like to see 100mpg though.
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