10-09-12, 09:23 AM
To clean out the melted O-ring material from where the pipes enter the cylinder head you'll need to take the carbs off... which will be a good opportunity to clear the carb heater circuits too.
If the Radweld was to bodge a leaking radiator you can find an aftermarket replacement (Delkevic) at about half the price of a Yamaha one.
As markbubble and darrsi say, you've got to get that gunge out of the system.
First thing I'd do before running the engine again is change the oil. Firstly, bike oil has a hard enough life as it is, overheating it drastically will have knackered it. Secondly, you may be able to see any water that has found it's way in there during the flushing process which would indicate a head gasket problem (at best).
Good luck.
