07-07-12, 01:29 AM
I had a similar problem with mine but it was below 3000 rpm! It was suggested i changed the spark plug caps,which i have done & its now running really sweet
http://foc-u.co.uk/index.php/topic,3648.0.html
The plug caps that were suggested are NGK SD05F about £15 for 4!
Hope this helps Ben
Ray

http://foc-u.co.uk/index.php/topic,3648.0.html
The plug caps that were suggested are NGK SD05F about £15 for 4!
Hope this helps Ben
Ray