07-16-2012, 10:06 PM #1
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.
07-16-2012, 10:13 PM #2
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
07-16-2012, 10:42 PM #3
I'm not sure if water got in. Here is a pic with the reeds removed.
07-16-2012, 10:58 PM #4
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.
07-16-2012, 11:16 PM #5
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.
07-17-2012, 10:53 AM #6
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.
07-17-2012, 11:28 AM #7
07-17-2012, 12:40 PM #8
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