www.YamahaR.co.uk

I have a 2005 R1 5VY that has done 27,000 miles and was used on the track about 10 times. I decided to check the valve clearances last week and they were all in the approved range.
When I put everythng back together and started up it only ran on three cylinders. I had put new plugs in - Iridium and ...