Last I saw when I was in Japan:
Head: ~6000 yen (actually a rear cylinder head)
Hose: ~2000 yen (special HRC part)
Coil: you can use an upper cylinder coil with the lower coil angled plug cap, the coil costs around 1200 yen brand new.
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Paul Herr
'88 FZR4/GSXR/YZF Frankenbike
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