The Audi Guy
Member
I've got this 96 SPX 720 dual carbs ski that runs like a bat out of hell at WOT but bogs off idle to the point that sometimes it will shut.
I've rebuild the carbs, changed plugs, pop off pressure is 32-35psi, new fuel hoses, bypassed water separator, cleaned selector valve (flows easily through both channels), I'm thinking about converting this ski to a single carb if I can't figure this out. 145psi compression.
It runs lean off idle...pilot jet to small?
I say it runs lean because I've had it in the water with the nose wedged against the dock and airbox lid off, if I cover most of the spark arrestor plate with my hand restricting air flow the bog is gone and it revs as intended....sounds healthier too.
All 3 pilot jet holes are clear and flow as intended when carb cleaner is shot through the pilot jet hole.
When I ride it I have to work the throttle with the choke to get past that first half and don't let it bog down.... once i get past that spot and it starts revving it'll run on the main jet all day long without skipping a beat....fast little thing (I have a 97&98 GTI that top out at 45mph and this little SPX runs circles around them).
Anyway I'm getting to the end of my patience and will convert it to single carb like the GTIs are if I can't figure it out.
Does anyone know where to buy pilot jets and what size do I need ? Could that be my issue ? Please advise!
Thank you in advance.
P.S. - should I try another set of carbs? I feel like if I'm gonna spend $$$ on another set of carbs I might as well convert it to a single carb.
I've rebuild the carbs, changed plugs, pop off pressure is 32-35psi, new fuel hoses, bypassed water separator, cleaned selector valve (flows easily through both channels), I'm thinking about converting this ski to a single carb if I can't figure this out. 145psi compression.
It runs lean off idle...pilot jet to small?
I say it runs lean because I've had it in the water with the nose wedged against the dock and airbox lid off, if I cover most of the spark arrestor plate with my hand restricting air flow the bog is gone and it revs as intended....sounds healthier too.
All 3 pilot jet holes are clear and flow as intended when carb cleaner is shot through the pilot jet hole.
When I ride it I have to work the throttle with the choke to get past that first half and don't let it bog down.... once i get past that spot and it starts revving it'll run on the main jet all day long without skipping a beat....fast little thing (I have a 97&98 GTI that top out at 45mph and this little SPX runs circles around them).
Anyway I'm getting to the end of my patience and will convert it to single carb like the GTIs are if I can't figure it out.
Does anyone know where to buy pilot jets and what size do I need ? Could that be my issue ? Please advise!
Thank you in advance.
P.S. - should I try another set of carbs? I feel like if I'm gonna spend $$$ on another set of carbs I might as well convert it to a single carb.
