97 speedster motor dies after throttling down

[doni]

My 97 speedster starts up and runs fine after blasting around the lake ,when I throttle down 1 motor idles down and dies the other motor is fine. Does anyone have any ideas? It idles at 1500 in water i tried bumping it up some more but it still did the same thing. Thanks in advance for the help

 

[MapPAC01]

I am having the same problem. I'll let you know when I find something out next week.

 

[doni]

I am having the same problem. I'll let you know when I find something out next week.

Sounds good. Thanks

 

[rusty nail]

check compression.

 

[MapPAC01]

My cousin is flying in to look at it in 1 month. I will let you know what we find out.

 

[doni]

Ok.
Thanks man

 

[POPPS]

Sounds fuel related,,,,starvation,,,go through the carbs,,,costs you nothing and easy to remove from your equations,

 

[doni]

Thanks for the reply, I rebuilt the carb, and it still contunued, then replaced the carb with a new rebuilt carb, and the same issue. It runs fine until i back the throttle down after running around the lake, assoon as i throttle down to idle to one motor dies,the other is fine.

 

[POPPS]

Almost sounds like you have a partially blocked low speed pilot circuit?,,,did you see the spray pattern of the bypass holes,,,they are very small?

 

[doni]

Thanks again for the reply i did not look at the spray pattern. Whats the likelihood i rebuild the original carb, and it continues, then get another new rebuilt carb and still the same problem? I set the idle to 1500 in the water, on the initial start up it starts and idles fine, I have to idle out about 1000ft to get out of no wake zone so i throw it in forward and it idles all the way out no problems. I open it up runs fine race around the lake and as soon as i back it down to enter no wake , The rpms go down and the one motor dies unless I feather it to keep it from dying. I m totally puzzled, and no way a expert with pwc's
I just dive in and try to figure stuff out, no one works on these in illinois that i know of or could trust, only rely on you guys .

 

[POPPS]

Was the rebuilt carb built with genuine mikuni parts?,,,if not,,,you will have issues,

 

[doni]

When I rebuilt the original carb I used mikuni kit.
The rebuilt i bought after said it was a genuine mikuni carb, but I dont know if they used mikuni parts or not. My rebuild with the mikuni kit made no change with the dying out when idling down. Should i do another rebuild kit, or get another carb again? or look else where for the issue , so frustrating!!

 

[POPPS]

No need to buy any carb...just service the ones you have properly,,,is the tank venting?,,is popoff to spec?,,don?'t fret,,,someone on here will know,,,