Sebastian Bluecrew
Member
Hey guys. New to the forum, but I have read the forum for years..
Long story short..
I have a 1997 Seadoo SP with a 720... Completely rebuilt, new everything, overbore 1.0mm, Factory Performance Pipe spec 1 with ECWI and rev limiter, Solas 16/24 Concord, AND, dual 40mm carbs...
So the stock machine was single 38mm carb. But with what I have read on the forums, the FPP will never run on a single 38.. Also read about the rear piston failure and detonation with this pipe so thats why I picked up dual 40mm carbs from an XP800 and rebuilt.. Jetting on these carbs 142.5/70, low screw out 1-1.5, high I tried 0, 1/8, 1/4, 1 turn out and it made no difference.
Here is my issue, before I keep going through these carbs over and over. It is not running right, no WOT or top end fuel circuit at all, falls on its face and once in a while will jump for a second off idle when i throttle it only half way(And man when it does, what a hit that is) then it falls out again.. On the trailer, this thing sounds nastier than my banshee!
This is the answer I cannot find.... The Seadoo manual says this 1997 SP is a "717D" and lists a completely different rotary valve duration and timing.. I am understanding that this SP was limited on engine power by using a single carb, different port timing and a shorter duration valve. Nobody has ever heard of a "717D" and I called SBT, I called a couple local shops... They all tell me there is no such thing. I had one shop pull up the fiche, and he says" Wow, that s funny, Seadoo shows a "?" next to the valve timing on the actual fiche for that year.." He said he never in all his years heard of anything other than a 159 degree valve for a 717/720...
I am using the stock 132 degree valve that came out of it, timed it 4 times, but when I changed to dual carbs does that mean I have to change the rotary valve to a different duration? OR, can I put in a 159 degree like every other 717? I think the jugs are specific to this one very model and probably has different port timing to accommodate this valve duration.
Thanks for the help..
Long story short..
I have a 1997 Seadoo SP with a 720... Completely rebuilt, new everything, overbore 1.0mm, Factory Performance Pipe spec 1 with ECWI and rev limiter, Solas 16/24 Concord, AND, dual 40mm carbs...
So the stock machine was single 38mm carb. But with what I have read on the forums, the FPP will never run on a single 38.. Also read about the rear piston failure and detonation with this pipe so thats why I picked up dual 40mm carbs from an XP800 and rebuilt.. Jetting on these carbs 142.5/70, low screw out 1-1.5, high I tried 0, 1/8, 1/4, 1 turn out and it made no difference.
Here is my issue, before I keep going through these carbs over and over. It is not running right, no WOT or top end fuel circuit at all, falls on its face and once in a while will jump for a second off idle when i throttle it only half way(And man when it does, what a hit that is) then it falls out again.. On the trailer, this thing sounds nastier than my banshee!
This is the answer I cannot find.... The Seadoo manual says this 1997 SP is a "717D" and lists a completely different rotary valve duration and timing.. I am understanding that this SP was limited on engine power by using a single carb, different port timing and a shorter duration valve. Nobody has ever heard of a "717D" and I called SBT, I called a couple local shops... They all tell me there is no such thing. I had one shop pull up the fiche, and he says" Wow, that s funny, Seadoo shows a "?" next to the valve timing on the actual fiche for that year.." He said he never in all his years heard of anything other than a 159 degree valve for a 717/720...
I am using the stock 132 degree valve that came out of it, timed it 4 times, but when I changed to dual carbs does that mean I have to change the rotary valve to a different duration? OR, can I put in a 159 degree like every other 717? I think the jugs are specific to this one very model and probably has different port timing to accommodate this valve duration.
Thanks for the help..