Hi Ray. I run a modified exhaust baffle that I used since day one. The length been shortened nearly in half with the packing completely removed. I then drilled three more holes in the rear of the exhaust flange. I get great performance with a real cool sound. I use regular unleaded gas with straight 40w oil. I broke the engine in with 20w50 synthetic oil that Dave at whizzer recommended back in early 2000. We came to find out that using the synthetic oil in these types of motor created the motors to blow out a lot of oil at higher rpms. It took awhile with plenty of oil changes to turn back the engine with use of straight 40w oil to not blow it out of the breather by the buckets. I bought a second WC1 and used straight 40w oil since the beginning and never had a oil problem? This is my experiences. I know the major component to these motors having all these types of issues is mainly caused by the way people operate them. If you let them idle never over revving, not letting them sit for long period of time running and don't run them wide open. You will probably experience fewer problems. A buddy of mine has one exactly like mine and he abused it and had head gasket leaks, valve seat problems, oil blowing all over his rear wheel etc. Take that for what it worth. I knew Quenton ever since I got in this hobby in the late 90s and he has been extremely beneficial helping others with minor to major problems and he helped develop these motors to be very reliable. I tell people they are what they are bicycles with motors with a lot of us thinking we are 13 years old but are 50 to 80 year old men having fun bringing back the good old days. Good luck and better get them whizers running spring is around the corner.