12-05-2021, 07:43 PM
When a friend had similar problems after a lay up period I went and removed only the valve cover and saw that two valves were not closing properly. I asked him to start it and keep it running while I leant on a large screwdriver inserted in turn into the springs of the two affected valves. If that is your problem the technique will save a lot of dismantling; if it is not you will not have wasted a lot of time trying. Good luck.