what is a electric valve number 16 on this picture:
http://workshop.nsr-world.com/MC18/MC18/Pic/F18.gif

if i will be use karbs without this valves, i must make a bibb on pipes from karbs?

and can i use 160/60/18 tyres on my mc18r5k instead 150/60/18?

sorry for my bad english
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2stroke 4ever!!!