Speed mod`s database 300x/lx

[jetdave56]

For the final ride @57f* humidity 60% a 1/2 tank of gas 75-75.8 @8210 rpms..

Next yr gotta try with trim up one notch and eat Salads all winter to hit 76mph..lol[emoji38]

Nice speeds. What plate you running? Cant see it im on mobile

the New Riva/TBM plate Mike, not the old 250/260 Riva plate that you have used and I tried to fit...

These are cold weather temp speeds though..

[slothman]

ok I ran the SeaSnake yesterday
conditions: 102^F hot as shit! , 40% humidity, wind 4mph, flat water
mods: rear tubes gone, bucket removed, left side tube added for air, Riva scom, stock grate/plate,
3/4 full gas and large ice chest in the front, rider weight 198 lbs
7950 RPMS and 70.5 gps

[jetdave56]

Ha ha you do live in Hell ...no worries you'll add another 200 rpms and 1 1/2 -2 miles when you ride in more seasonal and comfortable 70-75 *

[slothman]

Ha ha you do live in Hell ...no worries you'll add another 200 rpms and 1 1/2 -2 miles when you ride in more seasonal and comfortable 70-75 *

lol yea, won't cool down until october! ....I might open up the ecu panel and run a hose to the intake trumpet to crack 8000 rpm

[RMT]

you guys are getting fantastic results from your skis!
Completed a handful of WOT runs yesterday, best results:

2012 300X ~150hrs
Module to remove speed limiter / aftermarket prop and housing (installed by Kawasaki dealership unsure on specs), thermal coated exhaust and water box.
100km/h (62Mph) @ 7100RPM
salt water, very mild chop, 1/4 tank fuel, rider approx 70kgs (155 pounds), water 22c / 72F, air 20c / 68F

[Olomana]

VERY LOW! check sparks and exhaust filter.
Also put back stock propeller if you don't get at least 7600 rpm!

[sirbreaksalot]

Clean intercooler
check belt tensioner pivot etc

[RMT]

Thanks for the feedback guys!
My exhaust filter and supercharger belt are maybe 5 hours old so i would suggest they are fine, the tensioner etc are all brand new parts as a previous service mechanic left the bolt off the bracket and it went flying around my hull.
Plugs would be approaching 30 hours, possibly need a new set but they all looked fine at the point of new s/c belt and exhaust filter (5 hours ago).
Intercooler had a full clean about 10 hours ago, doesn't seem to be any gunk in there at the moment.
Unfortunately i don't have the old prop or housing, the current prop has about 70 hours on it now but has no cavitation and the hole shot is still ridiculous so i don't think it needs replacing.
The ski used to do well over 100kmh (62mph) when i first purchased it a few years ago, my gut feeling is it lost top end when Kawasaki here changed the prop to a different setup.

[BIONIC MAN]

At 100kmh, you're not even getting close to the stock, speed limited, speed.
Something is not right. The revs seem about right for the speed, but they are low too.

[nicjak]

mate guessing wont fix your problems, and dont use the max recall for speed or rpms. you need to check with a gps at wot and look at the speeds and rpms. if they then dont add up, i would be checking the prop, they dont last 70hrs. also check fp output at prime and sc belt pivot. all these sap rpms when they arent 100% spark plugs and dirty i/c dont sap rpm like that. my guess someone has fitted a 14/22 and what is the aftermarket housing?

[Fast VX]

Is the scom needed with R&D ecm reflash and do you know OEM prop pitch for 310's

[Ktmman]

Could u send few pic off this washer mod please?
Thanks

[GZA]

Could u send few pic off this washer mod please?
Thanks

Don't do it, just talk to Jamie at KSpeed (Brisbane Kawi) and get one of his flashes.

[Ktmman]

Does jamie make theses flashes?. So what's the difference between speed up module and speed controller? They both use brown wire on bottom plug from ecu?

[vinnyzilla]

Does jamie make theses flashes?. So what's the difference between speed up module and speed controller? They both use brown wire on bottom plug from ecu?

From what I've read the new ECU flash programs you don't need speed up cz they incorporate it. I'm like you, I don't wanna buy a speed controller module if I don't have too esp if built into the ECU flash we choose... But I have not read any confirmation of this by suppliers just members on here. And after further reading today found out my Ultra 310LX is really only good for up to mid 70s smooth water if with some $$$ and the right choices already tested here and still maintain some reliability on investment. So my thing is if I can't make it a drag ski and do 80MPH smooth water off market parts and flashes on 93-100 octane I'm gonna be happy to do the smart money and do that 73-74 91-93 octane with the "speed module" and all the available "AIR IN" mods --R&D cold air in - full kit, Riva perf power intake, 1* R&D wedge, R&D ride plate, pump shoe seal kit for an R&D grate (which now I think i want to switch to Riva grate stripped down naked for top speed smooth water), block off plate to clean up compartment, R&D 310 exhaust plate, since the family is gonna be on this ski so a noisy water box is out of the question and I heard a worthless gain/noise. I spent some money but still deciding on grate even though R&D shipped my R&D shoe seal kit for R&D grate... I just may save it for R&D grate rough water app and get me a Riva grate ordered and see if I can get that .5MPH gain or so I want there.

Cz pretty sure now I've spend all I'm gonna spend and call it good on 91 octane and maybe reflash later and get that fancy touch screen programmer to control both my skis would give me some tuning power and some race gas is on bucket list esp for the 1500. But for this season I'm done with 310LX mods esp now knowing more about this boat's limitations and I've chased the dragon before on UTV projects similar to this and my live and learn is kicking in. I only wanted this boat to match my new SX-R 1500 and they look bad ass together but and love the offshore dominance but smooth water the Yamaha monkeys get to 80MPH on like 800$ aftermarket invest so I've read... I just spent $900 so far on smart choices IMO or so and I would be tickled to get 73-74mph since I'm not going crazy exhaust (family unit style) w 91-93 octane. The R&D exhaust plate has smaller jacket ports to dry out box some and really that's all ya need water box wise. Its fun ordering all the same type goodies you've put on your jet skis over the years and I haven't even took these out yet just brought em both home recently and my 100MPH jackets are starting to arrive and I have Armando at R&D on speed dial lol... But like the member that has the image of kangaroo drinking a beer says, these Ultra 310 boats have limitations and don't get too caught up in the hype of suppliers cuz to make these do 73-75MPH somewhat reliably is about all there is gentlemen on smooth water IMO.