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So, here's what I did:
I checked my original plug (fitted by Yamaha at my 6,000 mile service) - it's an NGK CR8E
The cheap iridium plug I got from eBay is a CR7EIX which was clearly not the right one.
The new plug I bought and fitted today is a CR8EIX
Woo! I've got what feels like a brand new bike!
It's smooth, handles low revs really well and roars in all the right places.
Happy now. Thanks everyone.
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Bike: 2013 XT660Z, TKC70 tyres
Mods:
Barkbusters, Scottoiler, DIY Tail Mod, DNA Stage 3, Power Commander V & O2 Eliminator, Exan X-Black Stainless exhaust, Tool tube, Ohlins linear front fork springs, Nitron rear shock, JT front and Supersprox rear sprockets, D.I.D. VX 520 chain, Adventure Spec bashplate, DIY USB Outlet, DIY chain guide, Kev's Throttle mod
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