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  1. #1

    GP1300R (2003 Model)

    Hi...please can anyone tell me how much a full set of OEM throttle bodies are likely to cost (purchase price only within the USA)
    Think I may have trouble with a sticking throttle body on the back cylinder ?
    Have an intermittent spark & no spark problem & I believe its related to the throttle body not returning to closed or nearly closed position or could be the OTK OFF THROTTLE KILL SWITCH or even the end mounted TPS THROTTLE POSITION SWITCH

    I believe the sticking throttle body is somehow causing one of the above switches to cut in or out & hence I lose the spark at all three plugs.

    Tilt switch up front is fine & I think water temp sensor is ok ?
    Thanks guys its really appreciated....need this sorting really because i've sold the ski & it's now ended up in my workshop again & I have to rectify this quickly if possible

    Thankyou


  2. #2
    WATER WOODY's Avatar
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    Have you removed them and inspected them overall? You can find OEM TB's(used) in the $200.00+ range

  3. #3
    KamikazeGPR's Avatar
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    I recently had the same problem on my 03. throttle cable was stuck. Took it in for cable recall> They told me the throttle bodies were stuck as well. Yamaha price is $1100 for the entire throttle body(sensors, injectors ect) only way it is sold. Ross hooked me up with a set for $300. Dealer installed them.

    Ski still wouldnt start. No spark. They checked the TPS sensors on the YDS software. Checked out ok.

    I took ski from shop not running. Stopped at radio shack. Picked up a pack of 10k resistors 5 for $1.00. Unplugged the water temp sensor from the harness(next to the exhaust temp sensor you put chip in when you did the D-plate) Put the resistor in and it fired up. Plugged the water temp sensor back in. No start. Bad sensor. They can go that quick.

    Before you spend $60 on a water temp sensor try the resistor.

    At the least for $1 you can rule it out.
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  4. #4
    Quote Originally Posted by WATER WOODY View Post
    Have you removed them and inspected them overall? You can find OEM TB's(used) in the $200.00+ range
    Hi Water Woody....thanks for the info. I had trouble inspecting the throttle bodies thoroughly because I wasnt sure how to disconnect the fuel hose which connects to the gas tank at the gas tank end. I didn't want to cut the hose at either end & therefore I have been limited to inspecting the throttle bodies whilst still in the hull....nevertheless the fixing clamps & airbox were removed at the time but I was still very limited & would have preferred them out of the boat
    Many thanks....any help greatly appreciated Sir
    Regards
    Wayne

  5. #5
    Quote Originally Posted by KamikazeGPR View Post
    I recently had the same problem on my 03. throttle cable was stuck. Took it in for cable recall> They told me the throttle bodies were stuck as well. Yamaha price is $1100 for the entire throttle body(sensors, injectors ect) only way it is sold. Ross hooked me up with a set for $300. Dealer installed them.

    Ski still wouldnt start. No spark. They checked the TPS sensors on the YDS software. Checked out ok.

    I took ski from shop not running. Stopped at radio shack. Picked up a pack of 10k resistors 5 for $1.00. Unplugged the water temp sensor from the harness(next to the exhaust temp sensor you put chip in when you did the D-plate) Put the resistor in and it fired up. Plugged the water temp sensor back in. No start. Bad sensor. They can go that quick.

    Before you spend $60 on a water temp sensor try the resistor.

    At the least for $1 you can rule it out.
    Hi KamikazeGPR....many thanks for the follow up. I take it that you didn't actually do anything with the CAT TEMP SENSOR ?? Would I be right in saying that this sensor CANNOT KILL SPARK even if faulty or kaputt ??

    You mention the 10k resistors from Radio Shack....did you initially disconnect the Water Temp Sensor at the block & then connect one of the 10k resistors up to the water temp sensor multi block which is located on the small bracket near the CDI box....in effect you are looping the 10k resistor into the circuit & totally bypassing the sensor switch itself (because it is now disconnected so to speak).

    I'm still lead to believe the no spark issue is throttle body orientated but I have sold the ski & was kinda hoping it wasnt going to cost a kings ransom to put right. It just seemed kinda odd that I had a NO SPARK issue before & once the back throttle body had been free'd off then everything worked perfectly.

    Your advice is definately worth trying if you could follow up with any more info or pictures because as you can appreciate removing the stinger & throttle bodies etc etc can be a job in itself.
    Is there anyway I can check the Water Temp Sensor out on a multimeter ?
    Thankyou so much for your advice and efforts in advance
    Regards
    Wayne

  6. #6
    KamikazeGPR's Avatar
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    Yes, you are disconnecting the water temp sensor from the harness near the cdi box(no need to disconnect from the exhaust)

    Youre right, The resistor is mimicking the value the computer wants to see when the sensor is functioning correctly. The chip you put in when you replaced the Cat in the exhaust is just a 2k resistor in a fancy plastic connector.

    If the water temp sensor is bad it will kill spark. I still have the resistor in mine. havent ordered the new sensor yet. If i plug the sensor back in, I get no spark, resistor back in. Starts up

    Unlike the exhaust temp sensor chip. I cant drive the ski around with the water temp resistor in it for fear that if in the event i had a blockage and was overheating. The computer would never know til meltdown.

    The resistor is just to confirm the sensor is bad.
    Last edited by KamikazeGPR; 08-10-2008 at 06:46 PM.

  7. #7
    Quote Originally Posted by KamikazeGPR View Post
    Yes, you are disconnecting the water temp sensor from the harness near the cdi box(no need to disconnect from the exhaust)

    Youre right, The resistor is mimicking the value the computer wants to see when the sensor is functioning correctly. The chip you put in when you replaced the Cat in the exhaust is just a 2k resistor in a fancy plastic connector.

    If the water temp sensor is bad it will kill spark. I still have the resistor in mine. havent ordered the new sensor yet. If i plug the sensor back in, I get no spark, resistor back in. Starts up

    Unlike the exhaust temp sensor chip. I cant drive the ski around with the water temp resistor in it for fear that if in the event i had a blockage and was overheating. The computer would never know til meltdown.

    The resistor is just to confirm the sensor is bad.
    Hi Kamikaze GPR....many thanks for the update re the resistors & sensors etc. I'll pop down to Radio Shack when they re-open in the morning & give a 10k a try....gawd I hope & pray that this will remedy the problem ??
    I shall follow up with results of course. PS....i'm in the UK so please allow for any time difference in getting back to you with further input.
    Would you happen to know if throttle bodies can be reconditioned if the resistor trick doesnt do the job ?

    I'm also told that a 2k resistor can be used to bypass the cat temp sensor in the same way that you describe for the water temp sensor using a 10k resistor (cat removed of course & without any concerns whatsoever)

    Thankyou once again Sir & have a nice day
    Regards
    Wayne
    [email protected]

  8. #8
    WATER WOODY's Avatar
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    Unscrew gas cap and release air and screw back on.Pull the black cap that goes over the fuel connection.It just pops off.The red fuel lock,were the split is in the coupler,simply push them apart and slide it off.Be careful not to let it fall into the hull.They do make a tool to take these off but its not necessary.The fuel line can now be pulled off.Be sure not to get anything in this line when removing the TB's.Unplug wiring, loosen up hose clamps and remove TB's,then take off the throttle cable.
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  9. #9
    Quote Originally Posted by WATER WOODY View Post
    Unscrew gas cap and release air and screw back on.Pull the black cap that goes over the fuel connection.It just pops off.The red fuel lock,were the split is in the coupler,simply push them apart and slide it off.Be careful not to let it fall into the hull.They do make a tool to take these off but its not necessary.The fuel line can now be pulled off.Be sure not to get anything in this line when removing the TB's.Unplug wiring, loosen up hose clamps and remove TB's,then take off the throttle cable.
    Hi Water Woody....thankyou for the follow up, you guys in the US are an absolute wealth of information & i'm so grateful for any & all info you post my way.
    I shall keep you updated in return with my findings re the NO SPARK issue.
    This site Rocks & so do the members who help bring it all together
    Have a good day Sir & please take time to look at my posts....it was entitled something like SHOW OFF YOUR WIFE or something similar to that ?? Sorry I cannot recall exactly but I like to pay my bit back to the Green Hulk society too.
    Kinda getting late here in the UK & i'll be heading into the workshop to take a look at the ski in a few hours time
    Please watch this space & thanks again in advance
    Waynesworld2

  10. #10
    Quote Originally Posted by KamikazeGPR View Post
    I recently had the same problem on my 03. throttle cable was stuck. Took it in for cable recall> They told me the throttle bodies were stuck as well. Yamaha price is $1100 for the entire throttle body(sensors, injectors ect) only way it is sold. Ross hooked me up with a set for $300. Dealer installed them.

    Ski still wouldnt start. No spark. They checked the TPS sensors on the YDS software. Checked out ok.

    I took ski from shop not running. Stopped at radio shack. Picked up a pack of 10k resistors 5 for $1.00. Unplugged the water temp sensor from the harness(next to the exhaust temp sensor you put chip in when you did the D-plate) Put the resistor in and it fired up. Plugged the water temp sensor back in. No start. Bad sensor. They can go that quick.

    Before you spend $60 on a water temp sensor try the resistor.

    At the least for $1 you can rule it out.
    hi again....just a quick update re the NO SPARK issue on my GP1300R (2003 Model). I purchased some 10K resistors today & tried as you mentioned but unfortunately it hasn't remedied the Spark fault.
    Yamaha UK told me that a faulty Water Temp Sensor would limit revs but said that it WOULD NOT completely dis-arm the spark entirely. They say the system is designed to limit revs if the Water Temp Sensor fails because this would still enable a ski to get back to shore in the event of it going down whilst miles out at sea.
    Today I have checked right through the harness & all multiblocks, I have checked tilt switch once again, checked stop start switch, checked for free play on the throttle cable at the handle bar end, the ski has 3 brand new spark plugs, have checked the ground wire mounted to the front of the cylinder head to make sure this is ok.
    I still get NO SPARK on any HT lead & yet I still get the 01 (zero one code) which is supposed to be correct apparently.
    I am still convinced that the TPS or OTK switch(s) are faulty or a sticking throttle body.
    The ski is due to go back to the Yam main dealer & they are due to check the ski out with some specialist main dealer software connected upto the laptop (YDS software I think).
    Will keep you guys posted, it is beginning to be a nitemare this problem & as always any help is muchas gracias
    Thanks guys & have a good day

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