unless i can get some at trade prices for you.. my new job and all that... supplier of toyo tyres inc the R888's to various race series.. what size you after tony?? not sure yet thinkin about 205/50 r15
change ur plugs and leads first alex to rule them out if it still does it goin to be coil pack if it only 4 months old still be under warrenty ... as for plugs y not just use some ngks ??? cant remember wot ones i got thou ??? were only a few squid off ebay ...
there is a dent mark on the crank pulley aline that up with the line on the alloy cover and then the cams should be timed up and should be able to get the special tool in or a bit of flat metal plate