04-02-2008, 02:57 AM #1
- Join Date
- Dec 2007
How long should you get out of an engine?
Hello fellow jetskiers,
I have a 98 GP 1200 which i just had rebuilt about 20hrs ago.
The reison for the rebuild was the engine had a overheating prob.
talking to a few ppl about the yamaha engines,
I was told that the pre power valve engine needs to be rebuilt every 150hrs or so
Any input on this??
I here there is a mod to the barrel which helps with the piston problem,
Does anyone know of this mod and what is involve?
I just brought a 05 GPR1300
does this ski have the same engine problems ?
Any input would be gratefull
04-02-2008, 02:52 PM #2
there really is no set time limit on when to rebuild motors.. its all about who owns it and how well they take care of it...
your 1300r isnt the same as your 97 gp...
luckily your new ski doesnt have powervalves, so no need to worry about that problem..
im not sure of any barrel mods to help the piston,,, i do know you can have the pistons "windowed".. also theres a special coating that can be applied.
04-02-2008, 05:45 PM #3
I have heard its a good idea to have the cylinders bored with the exhaust manifold installed to prevent the bores from distorting from the manifolds weight/stress on the cylinder.
04-03-2008, 07:23 AM #4
04-04-2008, 12:47 AM #5
- Join Date
- Dec 2007
For all your help and input.
The reison im asking is that i know of 3 GP1200 that have done pistons.
and all of them have broken the top lip above the top ring on the exhaust side of the piston. and all the motors seam to go around the 100 to 130hrs
Talking to a few people around and i have being told that the yamaha 1200 and the 1300 engines all have the same problems.
this will be the 3rd time i have rebuilt this engine and the damage on the piston was allways in the same spot ( on the exhaust side ) of the piston.
The last rebuild, i had it board out to 10tho over and i thought that it would stop the piston picking up on the port.
04-04-2008, 12:55 AM #6
04-04-2008, 12:58 AM #7
i think you just have a problem and you havent fixed it so everytime you put it back together it does it again. like if you was lean and kept it lean even after the rebuild. is it possible something is hitting ur piston on ur exhaust side?
04-04-2008, 10:55 AM #8
Last edited by RDH; 04-04-2008 at 12:42 PM.
04-04-2008, 10:56 AM #9
04-04-2008, 12:38 PM #10
no powervalves on 65u motor- probably caused by detonation-is failure on #3 cylinder?
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