Results 1 to 6 of 6
  1. #1
    actis's Avatar
    Join Date
    Mar 2013
    Location
    maryland and florida
    Posts
    142
    +1
    5

    Saving a 951 di crank

    i bought a 2000 GTX DI 951. one cylinder had low comp so i pulled the motor. found a nick on the rave valve cylinder with the low compression. when i pulled the cylinders the problem was obvious. hole in the piston and 2 smeared rings. i'm wondering if the builder never shaved the raves to accommodate for the bigger bore. looks like a recent rebuild. ski has 128 hours was resleeved and has .50 pistons in it. i'm thinking might have been rebuilt at least twice. the good piston still was a little shinny looking fairly new. probably 10 hours on it. i know metal made it to the bottom end. rods have no play up and down but the usual left and right movement. you can see some aluminum on the rod. is there any way of saving the crank? split the casing and flush everything with solvent? my gut says replace the crank and obviously the top end.

    Click image for larger version. 

Name:	20131222_165909.jpg 
Views:	161 
Size:	140.7 KB 
ID:	320226Click image for larger version. 

Name:	20131222_174936.jpg 
Views:	333 
Size:	131.7 KB 
ID:	320227Click image for larger version. 

Name:	20131222_195156(1).jpg 
Views:	93 
Size:	94.2 KB 
ID:	320228


  2. #2

    Join Date
    Mar 2006
    Posts
    1,833
    +1
    119
    a new rod kit for sure.

  3. #3
    big john's Avatar
    Join Date
    Sep 2010
    Location
    Cocoa Beach, Florida, United States
    Posts
    3,395
    +1
    598
    i did that to my 951 twice, jim helped me get it right the third time and its still running !!!! make sure its really clean and hope for the best, expect the worse !!!!

  4. #4
    actis's Avatar
    Join Date
    Mar 2013
    Location
    maryland and florida
    Posts
    142
    +1
    5
    i noticed in my pictures a little discoloration near the bearing, kinda blueish. looks like it heated up. regrettably i think jims right. i guess i may as well replace the crank. i dont want to do this again in the near future. what a shame. i'll pick up a DI shop manual. thanks Jim and John

  5. #5
    Cliff's Avatar
    Join Date
    Jan 2006
    Location
    Middle Tennessee
    Posts
    207
    +1
    24
    I see it has .5 mm WSM pistons in it now. So it has built once before. It looks to me like it is running lean. That is probably what took out the first piston and no one fixed the original problem. Unfortunately a very common problem.

  6. #6
    actis's Avatar
    Join Date
    Mar 2013
    Location
    maryland and florida
    Posts
    142
    +1
    5
    Quote Originally Posted by Cliff View Post
    I see it has .5 mm WSM pistons in it now. So it has built once before. It looks to me like it is running lean. That is probably what took out the first piston and no one fixed the original problem. Unfortunately a very common problem.
    i thought that too Cliff but after looking closely i came to a different conclusion. i think this was caused by standard rave valves not being relieved (shaved) to accommodate for the over bore.
    i bought it with a bad cylinder so i checked the plugs and the bad cylinder was whitish indicating lean. pulled the rave and it had a small nick nothing major but when i removed the exhaust manifold it looked apparent to me the rave and piston rings kissed which i think caused the chain reaction of damage. with a .50 over bore and neither rave valve were relieved?! increasing the bore size reduces the clearance between the rave and the rings. once they hit, loss of compression and power. probably put the hole in the piston. then he limped it back to the ramp with the hole in the piston causing more air than fuel and running the plug lean. if he just would have shut it down when he lost power and arranged to be towed in. it might have been fixable with just a top end. one reason i never go out alone on my jet ski. i am going to check the fuel and air system anyhow just to be sure.

    Click image for larger version. 

Name:	20131221_210115.jpg 
Views:	74 
Size:	59.3 KB 
ID:	320259Click image for larger version. 

Name:	20131221_210144.jpg 
Views:	75 
Size:	45.9 KB 
ID:	320260

Thread Information

Users Browsing this Thread

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

Similar Threads

  1. WTB Crank for 2001 Sea Doo 951 DI
    By JohnCiccarelli in forum Sea Doo Classifieds
    Replies: 0
    Last Post: 06-30-2010, 01:20 PM
  2. Opinion on 951 DI HotRods Crank
    By 785xp in forum 2-Stroke Performance
    Replies: 6
    Last Post: 10-01-2009, 10:09 AM
  3. WTB: Crank for 2000 951 DI Motor
    By JohnCiccarelli in forum Sea Doo Classifieds
    Replies: 0
    Last Post: 04-03-2009, 08:03 AM
  4. 951 DI break-in
    By seadoo951 in forum 2-Stroke Performance
    Replies: 2
    Last Post: 05-12-2007, 09:14 AM
  5. 951 DI Guys.... anything new?
    By BigKID in forum 2-Stroke Performance
    Replies: 18
    Last Post: 04-05-2007, 07:53 AM

Posting Permissions

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