Hi Brian did i ever answer on donnington , yes used to go my first trip in Piper after rebuild 1980 , got there late loss all water due to dodgy pipe that was only 10 miles from the start ! made it though ,another time going down local motorway at a reasonable rate of notts blew a badly fitted core plug all the top piston rings broke , of coarse c./ plug was-behind flywheel engine rebuild no2 Derek