311Used jet pump assembly with mid shaft from a 1998 Yamaha Wave Runner GP800 .This assembly is in pretty good shape. Nozzle assembly works.  Impeller spins freely and doesn't appear to be gouged out or anything. Drive shaft Splines are good. Mid shaft is included as a freebie with no guarantees. It spins freely, but obviously it doesn't look the best. Whether or not it can be used as is, repaired, or used for parts is up to the buyer. Sale is for everything shown. Certainly not a perfect pump, but should offer some hours. I guarantee all our parts to be as pictured and described. Remember, not use crank will be perfect. 
Part numbers:Tunnel: 65V-51311-01-94 65V-51311-00-94Vane guide: 66E-51315-00-94Drive shaft: 66E-45511-00-00
This may fit:1998/1999 GP800But...  I can only guarantee it fits the year and model listed above. Please check with your local dealer, or an online microfiche (Seadoo Microfiche - will need to click on yamaha tab) to see if this part will work for you! Be sure to ask questions before bidding...I'm happy to provide more pics if necessary. Please take the time to leave us **5** star feedback! If there is a problem with your part, please don't hesitate to contact me. If we screwed up, we will fix it! We want every customer to be happy with their purchase!