A couple of weeks ago a customer came to me and asked if I could balance and tune his carbs as his 1980 Yamaha XJ650 wasn’t running right, As you can see in the vid I made for the customer the carbs are balanced perfectly on my digital balancer, so with this I investigated the running issue more and discovered the hea gasket and cylinder base gasket leaking oil everywhere, well this could well of been the issue so I ordered a new gasket striped the engine down and discovered