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Zx12r do not respond well to high octane fuel like v power 99 Ron because they are retarded by the timing wheel for safety reasons ie to slow them down if you advance the timing wheel by 4 degrees your bike will love v power fuel you can buy a 4 degree timing wheel off ebay its easy to change its on the exhaust side of the engine behind the black plastic cover to the right hand side of the clutch cover.
 
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