Results 1 to 8 of 8
  1. #1

    Join Date
    May 2007

    Cavitation damage in pump, 00' GP1200

    I was in the middle of installing a new impeller and saw what looked like cavitation damage in my pump(see pics). I'm doing the basic performance mods, impeller, grate, ride plate and pump seal. I just want to know if this will make a noticeable difference in performance.

    I posted this on PWCTODAY but I really didn't get the answer I was looking for. Any input would be appreciated.
    Attached Thumbnails Attached Thumbnails Click image for larger version. 

Name:	Pump 001.jpg 
Views:	118 
Size:	36.8 KB 
ID:	23904   Click image for larger version. 

Name:	Pump 002.jpg 
Views:	112 
Size:	41.4 KB 
ID:	23905   Click image for larger version. 

Name:	Pump 003.jpg 
Views:	92 
Size:	34.7 KB 
ID:	23906  

  2. #2
    mrbtd's Avatar
    Join Date
    Jul 2005
    Lindenhurst, Illinois, United States
    I would just smooth it out.

  3. #3
    Join Date
    Aug 2005
    if it gets too bad, it will blow that part right out. have had this happen. as a matter of fact, addicted has the pump right now, he welded it back will blow that piece out if it keeps it up

  4. #4
    Welcome to the forum. At this point I wish my pump looked as good as yours.

  5. #5
    Moderator OsideBill's Avatar
    Join Date
    Mar 2006
    United States
    First off Welcome to the forum

    The picture may not show how deep it is. I would smooth it out if it is surface only. When you re-install make sure you use some sealant between the pump and wear ring also make sure the wear ring is sealed to the transom most guys use Yamabond or equivalent for this.

  6. #6

    Join Date
    May 2007
    Yeah, I do plan on sealing that all up, thanks. I didn't look like Yamaha used a lot sealer, just enough to make a seal. Is that the best route to go? I just went to put the impeller on and the housing is all jazzed up. The prop won't even turn in there. So should I buy an OEM or after market housing. I ride about 30-40 hour a year kinda hard in fresh water (Lake Michigan). One more question when I turn the shaft by hand it seems somewhat hard to turn, well its not like a bike wheel it doesn't spin real fast. There is no sign of binding and when I took off the old impeller it looked ok.

  7. #7
    Moderator RX951's Avatar
    Join Date
    Apr 2005
    League City, Texas
    welcome to the forum

  8. #8
    spud's Avatar
    Join Date
    Jul 2006
    Oceanside, California
    O-Side Bill has a plastic lined liner that has new plastic in it he would probably let go pretty cheap.

    Seal the pump shoe too. That allows a lot of cavitation to happen. They make pump plug kits for that.

    Otherwise get a new liner from or tha like. In 01 they upgraded the liners with a thicker lining. Skat also will reline your old liner for about the same cost.

Thread Information

Users Browsing this Thread

There are currently 1 users browsing this thread. (0 members and 1 guests)

Similar Threads

  1. WTB 155 SB 12 vein mag pump for gp1200, gp800 ect
    By Tricky1 in forum Yamaha Classifieds
    Replies: 10
    Last Post: 05-28-2013, 02:23 PM
  2. WTB - Parts Seadoo 215-255hp Damage Jet Pump housing with broken veins or damage bearing seat
    By Luis Marine in forum Sea Doo 4Tec Skis
    Replies: 0
    Last Post: 06-13-2012, 09:45 PM
  3. Help removing pump from gp1200
    By MotoristKW in forum Yamaha PWC Performance (2-stroke)
    Replies: 8
    Last Post: 03-02-2012, 01:11 AM
  4. hull damage from pump shoe
    By banshee350racer in forum Yamaha How To & FAQs
    Replies: 9
    Last Post: 08-22-2009, 02:06 PM
  5. Question on Damage to Pump Support
    By meeper in forum 4-Tec Performance
    Replies: 17
    Last Post: 09-11-2006, 02:51 PM

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts