Just had my crankshaft reworked by a top bloke Sean Wilson, speedway guru and head dude at SWR, he fitted the new rod kit, finally after messing about with incorrectly supplied small ends from outside sources (obviously our fault) and then drilled and balanced the crank to 70% as recommended by Dale Lineweaver. I have now rebuilt my FE400 without the counter balancer and run it for a few hours, still bedding it in but it picks up super fast and there is no noticeable vibration snags and goes like f*** . If anyone wants engine or crank balancing advice have a look at Sean's site www.seanwilsonracing.co.uk or give him a ring 07974029964 , he likes a chat and is always very helpful.