09-09-2009, 12:43 PM #1
You guys that are having cavitation issues might want to reseal your transom plates. When I pulled the transom plate off I found a 1" wide section at the very top that had no sealant whatsoever. I know of at least 4 other skis that had this same issue.
Clean the old silicone off of the hull and clean the transom plate up real good and reinstall it using 3M 5200.
Last edited by Green Hulk; 02-17-2010 at 09:00 PM.
09-11-2009, 05:44 PM #2
While i had my transom plate out i took the time to true up the grate and wear ring to the transom plate. There was a bit of a step from the transom where it mates to the 160mm wear ring. Everything is now trued up and ready to reassemble.
Last edited by Green Hulk; 02-17-2010 at 08:45 PM.
09-13-2009, 07:35 PM #3
On the top of the transom plate there is only a very small edge to seal against the top of the pump tunnel which gives a high risk of the sealant blowing out. If you fill the cavity behind it with epoxy you now have a much larger sealing surface.
Last edited by Green Hulk; 02-17-2010 at 09:01 PM.
02-17-2010, 08:47 PM #4
I had an issue with my transom plate where it met up with the pump tunnel. The attached picture was taken with the grate removed and looking up into the pump tunnel. You can see the ridge hanging down from around the 9 oclock to the 3 oclock position.
I took a flapper sanding wheel on a drill and make this area flush with no ridge.
I know of many FZ's that suffer from this same problem so you will want to check yours.
You want a smooth flow of water entering the pump. That ridge can cause air bubbles and any air going thru the pump will result in a reduction in velocity.
02-17-2010, 08:49 PM #5
02-17-2010, 09:10 PM #6
You read my mind Jerry. I'm fianlly getting to this project this week & you saved me the time searching through your build thread.
02-17-2010, 09:22 PM #7
02-17-2010, 11:36 PM #8
Great stuff Jerry. This is the important pump trueing I always talk about. You posted this a long while back . Thanks for reposting, this is very important info.
02-18-2010, 12:48 AM #9
Very good info Jerry. You encounter or hear of this issue on many SHOs? Or just mainly FZ skis?
02-18-2010, 01:42 AM #10
Users Browsing this Thread
There are currently 2 users browsing this thread. (0 members and 2 guests)
By porksword in forum Yamaha PWC Performance (2-stroke)Replies: 19Last Post: 11-08-2007, 08:50 AM
By Green Hulk in forum 4-Tec PerformanceReplies: 3Last Post: 07-24-2007, 01:47 PM
By Jack Bauer On 15F in forum Kawasaki PWC Performance (4-stroke)Replies: 7Last Post: 05-14-2007, 10:48 PM
By LT1GMC in forum Yamaha PWC Performance (2-stroke)Replies: 1Last Post: 03-18-2007, 01:58 PM
By hbski in forum 4-Tec PerformanceReplies: 11Last Post: 06-26-2006, 11:03 AM