98 gsx 781 engine cuts out after 20 min

[michaelcrighton]

hi there guys ill tell you my story hehe bought seadoo just had rebuild top and bottom 1st run out after 20min hot ligh comes on and eng cuts out , 20min later start ok 5 min more same again so back to the shop , they thought injectors out they come and cleaned no go then coil no go again they have had it for 4 mnths and im hangin to get it fixed now sayin it might be the comp , it keeps dropping a cylinder then stops. before the rebuild it dropped a cylinder and ceased up , wer do i go from here thanks guys im in melb australia maybe try another comp wer can i get one to try or what else to look for the shop is outa ideas.

 

[crisso]

G,day mate.Sort of got what you were talking about but ,struth,it was really hard to understand what you wrote.Plezzzzzzzzzzze.The clearer the question,the clearer the answer

 

[Bills86e]

You should be checking your plugs, You must have a bad injector in that
cylinder for it to be going lean and siezing. Remove & clean your raves,
and look in those opening for piston skirt scoring.

 

[michaelcrighton]

hi talked to them again at the shop they had the injectors cleaned twice now. that was there 1st thought. still did the same thing . they have checked the faults, 1st time it said it was the coil but got a new coil and it didnt help now they say its the computer so what im after is a second hand one or someone that would let me borrow theirs to see if that would fix it. where can i buy a second hand one in melbourne and who has parts for these things in melb is there a seadoo wreckers and how much am i looking at. the shop said something like $2000 for a newcomputer one. read my 1st log and sorry yes it was abit hard to understand. thanks guys

 

[seadooya]

Get your ski, buy a compression tester from an auto parts store, and get the readings. If your around 120-160lb, then your motor is good, but if they are around 10% difference, then the motor is not looking godd.

After compression reading, and you find the readinga are acceptable, hook hose to it, and fire it up, and see if you see a "stream" of water out the back, tell-tale. If not, start going over yuor cooling system. If so, then re-check your "RAVES"..(black cap on motors), make sure they move smoothly. IF all is good, then disconnect the temp sensor on top of motor, and try your ski.