Freestyle DASA 950 8mil Tuning

[dcg5116]

Hey Guys,

Looking to see if anyone has jetting recommendations for their DASA 950. I have been trying multiple combos, documenting each run, adjust, repeat. Think I'm on the right path, just want to see what other people have experienced and be a little on the cautious side to make sure I'm not going too low.

Currently setup with 132.5p, 117.5M, 1 turn low, 3/4 turn high, 2.5n/s 115g 18/19psi. RRP Pipe, OEM electronics with enhancer.

Seems to be loading up a bit on the low side, high has tons of power. Thinking about switching to a 2.3 needle.

Thanks.

 

[jo5hi3]

What carbs are you running???

 

[dcg5116]

Sorry. Completely missed that. Mikuni 46's.

 

[OtherDonnieGuy]

Sorry. Completely missed that. Mikuni 46's.

Best option would be to ditch those 46s and make your package complete with some nice carbs, call up Novi and get some 48s, they will likely come jetted very well for your application. That will wake up that motor.

but to fix what you have, does it load up when you ride slower and steady throttle around for 10 seconds or longer under say 1/3 throttle?if this, I'd try dropping pilot jet 1 size... Assuming that low speed is set properly and no issues with n/s.

Or if it loads up only when when you let it idle all the way down for more than a few seconds, or crossing a no wake area, Then go after pop off and reset low speed screw.

 

[dcg5116]

Thanks for the tip. Hopefully I’ll get back to the water this week to do more tuning.


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[waxhead]

your pop off is way to low. The idea of changing to a 2.3 is a good one

 

[fastgtfairlane]

Have you checked your fuel pressure? Might consider drilling out the factory return restrictor and tapping your return tee for a mikuni main jet on the tank side. This thread could be very helpful. https://www.x-h2o.com/threads/importance-of-the-correct-return-jet-sizing.176798/

I'm running a ported 735 will all the Bolt ons, dual 44s with dual pumps, and inlets. Fuel pressure on my setup was over 3psi at idle with a 70 jet. Ski ran very similar to one described in the thread, could never seem to get rid of an off idle bog and got absolutely horrible fuel mileage. Went to 80 restrictor and it instantly cleared up
Not completely but much better. I want to try a 85 and I think that will get it perfect. Just going to the 80 has helped a lot and fuel economy is much much better. I'd start with that, get your fuel pressure around 2psi at idle and go from there. I think youd be shocked how much difference it will make. Especially on a 950. Definitely worth considering before replacing a nice set of 46s

The pic shows the factory restrictor above the internal filter.

 

[OtherDonnieGuy]

Have you checked your fuel pressure? Might consider drilling out the factory return restrictor and tapping your return tee for a mikuni main jet on the tank side. This thread could be very helpful. https://www.x-h2o.com/threads/importance-of-the-correct-return-jet-sizing.176798/

I'm running a ported 735 will all the Bolt ons, dual 44s with dual pumps, and inlets. Fuel pressure on my setup was over 3psi at idle with a 70 jet. Ski ran very similar to one described in the thread, could never seem to get rid of an off idle bog and got absolutely horrible fuel mileage. Went to 80 restrictor and it instantly cleared up
Not completely but much better. I want to try a 85 and I think that will get it perfect. Just going to the 80 has helped a lot and fuel economy is much much better. I'd start with that, get your fuel pressure around 2psi at idle and go from there. I think youd be shocked how much difference it will make. Especially on a 950. Definitely worth considering before replacing a nice set of 46s

The pic shows the factory restrictor above the internal filter.

Looks like you have oem 44s judging y the black paint? His should not have restrictors in it. Also, Did you try raising your pop off pressure any before changing fuel restrictor sizes?

 

[fastgtfairlane]

Those are oem 44s indeed. I'm running mikuni "R" series 44s not 760s. I got them from lpw and he drilled them out. He also did the engine work and recommended the jetting and restrictor setting. I tried popoff, jetting changes, everything. Could never get the dead spot out. Just move it lower or higher in throttle position. Found the thread I posted. After several conversations with paul i was able to get a 80 jet locally. Finally broke down and got a fuel pressure gauge from local auto parts store and tried it out. I went back to the original settings he gave me but with the 80 jet and it is much better. Not quite where I want it but much closer. My fp was around 2.5 psi at idle and 7psi at wot. I think a 85 will get me to target 2psi at idle and 6psi wot. May still have to rejet but get that set first, then proceed forward. That thread goes into great detail for the need for doing this especially on a stroker or 800+ cc engine. Because of the higher pulse these engines produce much higher than what the pumps were designed for. All of the novi and full specs have drilled restrictors for this reason.

 

[dcg5116]

I have been reading a ton about fuel pressure actually. The carbs are 46’s that were drilled out by XS. I had a spare set on the shelf. Currently running a 80 return jet. I am going to measure the PSI this week and will update my findings.


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[fastgtfairlane]

A friend just put his ski together with a xs 900ss, dual 46s, pfp pipe ran wet, zeel. We went with 70 just cause that's what I have and was getting 3.5psi at idle and almost 9psi at wot on a trailer. We're gonna try a 90 next I think that will get it. I did some searching and found that the 900ss likes around 90-100 jet. Hes running 2.0n/s, 65g spring @18psi popoff, 125p 117.5m 1.5 turn out both screws. Ran pretty solid honestly but we havent touched anything yet. Also worth noting, I use a tach for a string trimmer just to set idle speed and mixture. Just to keep things consistent. It doesnt update quick enough for anything more than that but it is useful for setting idle speed and getting your mixture screws dialed on a trailer

 

[pioui1]

You are pretty close , I have from Dasa
135P, 125M 2.5 NS,115g spring, with power factor with twin 49 ,the 49 I forgot if they where the full spec or the Dasa, But the 46 sbn will do fine,

I have something else from Scotts, for twin 46 and power factor, 125P,135M,2.0 NS,27 Psi pop off,1.5 turns on the low and 7/8 turn on the top