99 SPX dies letting off throttle

Messages
196
Likes
1
Location
Belleville, On
Water Crafts
96 Sea doo xp 800 and 95 xp 717
#1
Hey Guys,

So on my last ride of the season this summer whenever I let off the throttle the ski would die unless I feathered the throttle very carefully but still most of the time it would die regardless, some history on the carbs is I had to run two different pop-off springs to get same pop-off for both carbs, couldnt find any issue with the method i was useing to test pop-off so not sure why but the ski ran great for whole season up until the last ride, it still accelerates strong and hit a top GPS speed of 94km/hr (58.4mph) on that day, I guess having single ring pistons and a SC-XO prop without intake grate helps a bit and my 150lb self. For the occasional time I could stop it from dieing if I punched the throttle right away it would not react quick and was very slow indicating not enough fuel in carb I think. Only other work I did if I remember right is I replaced the fuel pump and associated check valves (little round plastic discs). Only conclusion I can come to is the check valves maybe are bad either because I damaged them a little on install or because they were from a WSM carb kit. Thing that gets me is it ran for approx. 10 hours no problems.

I guess my question is what else could it be? The ski will run WOT all day and carb is clean. Just want to make sure I am buying the most probable part that is bad as I dont want to buy a full carb rebuild kit. Thanks
 


Paul Bretz

Active Member
Messages
225
Likes
29
Location
New Baden IL
Water Crafts
many 96 xp's
97 gsx
hx 800
#2
This may sound like a stupid question and im not trying to be an ass but is your idle set correctly? Does it idle out of the water?
 
Messages
196
Likes
1
Location
Belleville, On
Water Crafts
96 Sea doo xp 800 and 95 xp 717
#3
Actually im not sure if it is set correctly so good point. Now that I remember the ski on that day was having a little trouble starting but I noticed if i held the throttle ever so slightly open when trying to start it that it would start up a bit faster so yea thats a very real possibility. Cant believe I forgot all about that, maybe the idle screw loosened off a bit or was borderline good enough before, I dont know, I just read somewhere that after idle screw just touches the tang, 2 turns in should put me in the ballpark so ill check and see if its around there tommorow.
 

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