Results 1 to 8 of 8
  1. #1
    silver93t's Avatar
    Join Date
    Jun 2012
    Location
    NJ
    Posts
    1,064
    +1
    49

    Would you tear down this gp1200r motor for a rebuild?

    I recently purchased a 2000 gp1200r. The previous owner said he took the ski to the dealer for a tuneup and they left a water hose loose. it popped off when riding and flooded the hull. The ski sat for a while as he had no time to work on i. He last messed with it in 2007 and couldn't get the motor to turn over. I found the starter to be siezed and had it rebuilt. After squirting some yamaha 2w oil into the spark plug holes and through the reeds and oil injection ports, I ran power to the starter and got compression readings of 120-120-115psi front to rear. Would you guys tear this motor down for a full rebuild? I'm thinking of just rebuilding the carbs and putting it together to run as is. Opinions? Thanks.


  2. #2
    Superman! fivespeedsteed's Avatar
    Join Date
    May 2010
    Location
    Midlothian VA
    Posts
    1,058
    +1
    14
    If water got in that motor, rust on the crank is definatly an issue, or will be, you could go ahead and just get it together, just be ready for it to screw up. Its a matter of if you just want to get it running to try it out, or if you want a reliable motor that will work great for years and years

  3. #3
    silver93t's Avatar
    Join Date
    Jun 2012
    Location
    NJ
    Posts
    1,064
    +1
    49
    I'm not sure if water got in. Here is a pic with the reeds removed.
    Attached Thumbnails Attached Thumbnails Click image for larger version. 

Name:	20120716_172852.jpg 
Views:	70 
Size:	93.1 KB 
ID:	277524   Click image for larger version. 

Name:	20120716_172902.jpg 
Views:	68 
Size:	79.4 KB 
ID:	277525   Click image for larger version. 

Name:	20120716_172911.jpg 
Views:	57 
Size:	68.7 KB 
ID:	277526  

  4. #4
    mudslanger's Avatar
    Join Date
    Jul 2010
    Location
    Huntsville Al
    Posts
    1,326
    +1
    49
    From the pics everything looks good but if that thing starts roaring like a steel wheel rolling on concrete shut it down asap and tow it in.

  5. #5
    Superman! fivespeedsteed's Avatar
    Join Date
    May 2010
    Location
    Midlothian VA
    Posts
    1,058
    +1
    14
    May not have gotten water in there. Its not much work to pull the motor out and split the cases and have a look see. If the motors got over 60 or so hours on it it wouldn't be a bad idea to do crank seals so it holds pressure.

    My 100 hr motor had shot crank seals, held no pressure when I replaced a piston and got it all back together. I pulled the exhaust, jugs and pistons and lifted the motor out by myself. Split the cases, checked out the crank, all seemed to be well, put in new crank seals, built it back up and it held pressure like a champ.

    If your goin through the trouble to replace some stuff, might as well get it all apart and check tolerances with a feeler gauge. When I did all that work to mine I found things like blown crank seals, missing bolt from my stinger, ect,ect.

  6. #6
    silver93t's Avatar
    Join Date
    Jun 2012
    Location
    NJ
    Posts
    1,064
    +1
    49
    Unsure of hours. I haven't run power to the cluster. Honestly I'm thinking of just rebuilding the carbs andpower valves, adding the wave eater clips, blocking of the oil pump, and throwing it together. If it blows it blows. I'll do a performance build from bottom up in the off season.

  7. #7
    powerstroke specialist mikegp's Avatar
    Join Date
    Mar 2011
    Posts
    2,529
    +1
    190
    Quote Originally Posted by silver93t View Post
    Unsure of hours. I haven't run power to the cluster. Honestly I'm thinking of just rebuilding the carbs andpower valves, adding the wave eater clips, blocking of the oil pump, and throwing it together. If it blows it blows. I'll do a performance build from bottom up in the off season.
    I'm with you, no need to spend money , it looks fine,if water got in that crank it will be rusted already,it don't take long to see rust spots appeared.
    put that thing together and run the hell out it.

  8. #8
    TX21's Avatar
    Join Date
    May 2007
    Location
    North Texas
    Posts
    988
    +1
    7
    Quote Originally Posted by fivespeedsteed View Post
    May not have gotten water in there. Its not much work to pull the motor out and split the cases and have a look see. If the motors got over 60 or so hours on it it wouldn't be a bad idea to do crank seals so it holds pressure.

    My 100 hr motor had shot crank seals, held no pressure when I replaced a piston and got it all back together. I pulled the exhaust, jugs and pistons and lifted the motor out by myself. Split the cases, checked out the crank, all seemed to be well, put in new crank seals, built it back up and it held pressure like a champ.

    If your goin through the trouble to replace some stuff, might as well get it all apart and check tolerances with a feeler gauge. When I did all that work to mine I found things like blown crank seals, missing bolt from my stinger, ect,ect.
    Im with this guy, did the same myself. I'd pull it and split the cases at least. Check the bearings out see if there are rust spots on them and make your choice based on that.

Thread Information

Users Browsing this Thread

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

Similar Threads

  1. Replies: 16
    Last Post: 08-20-2014, 08:08 PM
  2. Replies: 5
    Last Post: 06-27-2014, 01:31 PM
  3. How would you go about this on a gpr
    By L Carlson in forum Yamaha Open Discussion
    Replies: 5
    Last Post: 06-01-2009, 03:56 PM
  4. What do you think of this price quote for this safety package?
    By tempest.runner in forum Canada Rides
    Replies: 4
    Last Post: 05-21-2009, 09:48 PM
  5. How would you guys do this ?
    By gotpurp305 in forum Open Discussion
    Replies: 25
    Last Post: 08-24-2007, 07:57 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
  •