YS91FZ Super charged light usage with Perry pump, setup for smoke. Bearings in great condition, compression is fine. Multiple YS parts included(some can be used on this model YS, and some on others), also included is a NMPES90S 90 degree exhaust which can be used for this engine. Has been stored with mobile 1 to protect the engine, bearings, and diaphragm. Engine ran fine the last time I used it. I lost the YS check valve. Payment through PayPal, USPS CONUS shipping. Sold as is.