Thread: Seadoo 951 speed Problem
02-09-2010, 06:51 AM #1
Seadoo 951 speed Problem
Well first this is what my seadoo "98 951 has in it,
-ADA Racing Head 49cc Domes
-Prok Flame Arrestors
-WORX intake grate
-solas 15/20 impeller
with these mods done to the ski shouldnt i be hitting around 63-64mph?
I took it out with my dad the other day and it was flat as a tack about 22c (melbourne,Australia)
and the speeds i hit were 53,54.1,55.2 then i topped out after playing with the trim 56.2mph. we have recently changed spark plugs, and if its our tunning could somone point out what our higs and lows should be set at.
At the moment they are
Lows 1.1/2 both
Highs ??? lol cant find them on the caburetor
So if someone could give us a starting point it would be a great help and i will come beack to you with more GPS speeds.
02-09-2010, 08:23 AM #2
What RPM are you turning and how are getting the speed (GPS or the Speedo)?
Did you get this boat with these mods?
Is this the first time you rode it?
The HS screws are on the bottom of the carbs when mounted. If the person who put the Proks on did not install the extended "T" handle screws you will have a hard time adjusting them on the engine.
02-09-2010, 03:22 PM #3
I would hope that with that head and the flame arrestors that the carbs had been jetted to suit. You need to whip them off and have a peek at the jets and see. Maybe a carb service might be needed too. Also, ADA do a 48cc dome or a 50cc but not 49cc. What octane fuel are you using ?
02-09-2010, 04:10 PM #4
-What RPM are you turning and how are getting the speed
The RPM's i am turning is about 6500-6600RPM
-(GPS or the Speedo)?
I am using a GPS
-Did you get this boat with these mods?
No the boat came stock
-Is this the first time you rode it?
No i have been riding this ski for neally a year
-What octane fuel are you using ?
I am using 98 octane
Thanks guys hope this helps
02-09-2010, 04:13 PM #5
- Join Date
- Feb 2006
- Warner Robins, GA Home of the 2007 All-Star Little League World Champions!
The Concord is overpropped for your setup. If you put the stock prop back on, and it's in good shape (no dings and not worn out) then you will easily be at 63 mph turning 6900+ rpms.
I'd try this first and see what you get.
If you don't see these rpms then you have RAVE issues.
02-09-2010, 05:11 PM #6
What's the jetting in the carb's? Put the stock grate back on.
02-09-2010, 07:08 PM #7
The grate is not doing this to his boat. Yes it is a bit faster on glass with the stock grate but that is the only difference. It would not cost you 500rpm. Knowing what the jetting is would help.
Like RQ, I feel like the Concord 15/20 is too much prop (need a pipe for that sucker, IMO).
Has it run like this since you did these mods? I mean, if it ever ran up around 6900-7000 (and if it was turning that prop it would be in the 65mph range) and now it does not then that indicates a failure (as RQ said, RAVEs, perhaps). If it has always run that way then the set up is to blame.
02-09-2010, 08:18 PM #8
When i first got the ski im sure it was hitting 58-60MPH without prop, and every since we did the mod we have had problems with it. Like the engine not running right and we finaly figured out it was the spark plugs.
Only now we have got it back to normal.
But i have noticed that the one of the RAVE valves on the rear cylinder has been leaking oil. Would that be the problem. Or should i put the stock prop back on.
02-09-2010, 09:42 PM #9
- Join Date
- Sep 2009
Uh, what boat are you talking about here? XPL? GSXL? GTXL?
02-09-2010, 10:07 PM #10
I had my TPS on the throttle cable go bad. When it goes bad the timing will not advence when you go from 3/4 to full throttle.
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