Hi all.
Yes there is a known problem with the RFVC 600/650 engine,in particular the cylinder head cracking due to excessive overheating.Seems to be caused by standing in traffic/stationary with the engine running after a long run when everything is stinking hot.The cracks usually run from the two exhaust valve seats to the central spark plug hole,and when they get bad enough the valve seats drop out.Unfortunatly the only real soloution to this is a new cylinder head,though i've been told it can sometimes be welded at great cost.I decided to bite the bullet and go for a new head,as i'd rather not have the hassle of it happening again.I am now very wary of switching the motor off if it's stationary for even a short while,as i'd rather spend the £550 on my next trip....
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Just going for a short ride on my bike....
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