07-14-2009, 09:05 PM #1
Got my triple pipe boat on the water
Finally got my ski out on the water over the weekend. Setup the plate without too much angle for starters. Only had enough shims to shim the tabs down .080". Will try adding more. Ski was surprisingly stable, compared to what I'm used to. Power is very impressive...I think I got the jetting fairly close on the first try...Had to turn the lows in a bit, but it rockets out of the hole now. Did a few quick WOT bursts, and saw 7600 rpm. I'm down 200-300 rpm (IIRC, these Speedwerx pipes want 7900ish rpm). Motor is a little rich on top. Didn't want to hold the new motor at WOT for more than a few seconds at a time. Still not sure what impeller I have on there...Its a Concord 14/20, but don't know if its bent or not. Boat was running 112 octane before with high compression domes, so it's possible the impeller is too steep. I also have a new 13/19 as well as a Nujet. What impeller do others run with a triple pipe, ported, 1200, just so I have an idea if I'm in the ballpark or not?
Speedwerx ported 66v cylinders
Latest revision Speedwerx triple pipes
Speedwerx head with 150psi domes
48mm Novis w/ 127.5P 160M, 2.3n/s 115g spring (had to adjust the jetting from the previous owner, since I removed the Dominator intake)
Dual pickup w/ dual Mikuni pentagon pumps
Speedwerx intake manifold
VFIII reeds w/ spacer plate
Advent CDI w/ pump gas Speedwerx curve
800 intake grate
Island MOD1 ride plate w/ .090" shims in rear.
Protec extended nozzle
2" pump extension
And a few other little mods
Last edited by PolarisNut; 07-28-2009 at 07:32 AM.
07-14-2009, 10:47 PM #2
Hey Brad, not sure if I heard this right from Craig but arn't you running a Skat pump?
07-14-2009, 11:04 PM #3
07-14-2009, 11:17 PM #4
Ahhh....I was thinking that you were running it. All I have is the 14 vein for mine with the 13/19 swril
07-15-2009, 07:01 PM #5
- Join Date
- Apr 2006
- South MS
Nothing like the pull of tripples
Never had a 1200 tripple only a 1300+ but my guess would be around a 13/19 to 14/20 should work. Wait till you get the carbs tuned in perfect and see what it turns that 14/20 in this heat.
I think tripples are sensitive on carb adjustments and prop size.
07-15-2009, 09:32 PM #6
07-15-2009, 09:54 PM #7
main jet may be a little steep
usually takes a 13/19 prop with the 87mm nozzle on the old style pump
07-15-2009, 10:29 PM #8
I run a fuel pressure guage on my triple BB. A fuel pressure guage is a real good thing to have. At WOT, if the fuel pressure drops,its an instant answer to a lean fuel issue. A tach is also a must.These engines need to maintain a steady pressure. Now at 4100' elevation,i ran my Novi's at 120 pilot,130 main,2.3 ns, 80 gram spring on a ported 1300 triple pipe and i was running a little fat but this is at 4100'. I would say your mains are too big IMO. Try turning the mains 2 turns out,make 2-3 passes and get an rpm reading. Turn the mains 1/4 turn in and make another pass to see if your rpm's are coming up.Come in another 1/4 turn if your rpm's are climbing.Also,what return jet are you using? Always start out rich then come back in.
Your weather will kill rpm also.Whats your RAD when you tested? Also,isnt this a new engine? If so,give it some time to do a few heat cycles to loosen up.
07-15-2009, 11:11 PM #9
I've got a spare 87mm nozzle that still has the siphon tube in it if you need or want to try it. I haven't ridden with you yet this year.... I'll be in Port Huron playing on the river if you want to meet up there Saturday.
07-18-2009, 11:22 PM #10
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