Another dual 44's tuning question

[Freestyleriverrat]

I am confused why you are trying to set the mid range(1/2 throttle) mixture on your ski with the high speed ( 3/4 upwards) circuit

you are using massive jets in the top end with heaps of turns out to try and get the midrange into your ski

I'm not trying to set anything yet. Turning the top end screws out 2.5 was done to keep the ski from overheating from a lean condition that was noticed earlier in the week. I am going to wait for the new jets before I take it out again. the lowend is feeling pretty good (1.5 out on the low) but I have only touched the surface of the mid and non of the top. The ski is not broken in yet so I have not really taken it above or up to 1/2 throttle. I have come close and feel that hesitation barrier but have not tried to push beyond that. Righ now I am cool with running it rich but I have only ridden the ski for about 30min total.

I am getting an assortment of jets between 115-125 M&P so I have enough to set it up a number of ways.

 

[Freestyleriverrat]

That's exactly the situation I ran into. I ran a 110 main (115 pilot) and it just wouldn't go past 1/2 throttle.
I swapped in a 125 main - perfect.

I am just approaching the 1/2 throttle mark and that is the what it looks like mine is doing.

 

[x-jetter]

you say you ride every where fast but you fouled a plug
dont you think you may be to rich up top ??
you are thinking abut changing the low speed jet to fix the high speed fouling

once you are over about 1/2 throttle the pop off presure will not be effecting you much at al
so it s a combination of the jets
do you still have that massive 115 in the top
if so then drop that down and hang on

well i wasn't driving fast when it fouled because it was so rough, i was mostly just hitting waves and thrashin it around and stuff. i do think my high ends are what ultimately caused the foul, but the ns does need to go down too because it was acting almost like it was flooded every time i wanted to hit a wave. i do still have the 115 main in, should i just drop down 1 size to 112.5, or should i go down to 110?

 

[Freestyleriverrat]

well i wasn't driving fast when it fouled because it was so rough, i was mostly just hitting waves and thrashin it around and stuff. i do think my high ends are what ultimately caused the foul, but the ns does need to go down too because it was acting almost like it was flooded every time i wanted to hit a wave. i do still have the 115 main in, should i just drop down 1 size to 112.5, or should i go down to 110?

I would do the N/S and 95g spring first then go from there. So you have 115'sp and ???M. Was it 120's?

 

[x-jetter]

i've got a 115g spring in right now, with 120 p's and 115 m's.

 

[Freestyleriverrat]

well i wasn't driving fast when it fouled because it was so rough, i was mostly just hitting waves and thrashin it around and stuff. i do think my high ends are what ultimately caused the foul, but the ns does need to go down too because it was acting almost like it was flooded every time i wanted to hit a wave. i do still have the 115 main in, should i just drop down 1 size to 112.5, or should i go down to 110?

I wonder if you are to rich on the low end. maybe dropping the p down will help as well. I would still do the n/s and spring first but it kind of sounds like rich bogging. If you fouled that plug in the chopp then maybe the ski was running in the low to mid, if clears out up top I would look towards the low end of the spectrum.

 

[Matt_E]

Wow...120 pilot. I'd try dropping that. (From my personal experience. This may not work at all on your motor)

 

[Mark44]

I tried 120 pilots in mine and
Damn was that thing was rich. I am at 115 now.

 

[Freestyleriverrat]

I'm at 117.5 p's and that is feeling ok, but once I do the 120 or 125 M's I think it may benifit from being dropping to 115 p's, I won't really know until I swap that 110 M out.

 

[Matt_E]

Just for ********s & giggles, try 115 pilots and 125 mains. See what happens.

 

[Freestyleriverrat]

Just for ********s & giggles, try 115 pilots and 125 mains. See what happens.

That is what I am doing. I am breaking the motor in anyway and I would rather be rich than lean. I got close to 1/2 throttle and it felt like it hit a wall, it was doing what you described when you had 110's in there.

 

[Freestyleriverrat]

Took the ski to the water today running 115p and 120m. Ran good but I do think I need to drop the pop off a little. Thus far I have concluded that the 115p and 120m is a better starting point than the 110m and 117.5p. Ski ran so much better it was stupid :Banane01: This is definatly a better spot to sit for the break in period! Upping both the low and high jet maybe in the near future. Maybe 125 or 130 on the high and possibly go back to the 117.5 low will be a good jet setting. We will see what the pop off does first. Still have allot of tuning to do but it was definatly a nice improvement over yesterday.

The low jet was 1 turn out and the high was set at 1.5 out.

 

[Mile9c1]

Just for ********s & giggles, try 115 pilots and 125 mains. See what happens.

I ran that last year in my 754cc Able stroker, and I'm running it now in an 800cc stroker, and it seems like tits :biggthumpup: Running about 27psi popoff.

Funny how the two engines are ported totally differently, yet they like the same jetting.

 

[Matt_E]

:biggthumpup:
Thumbs up Mike. And actually, since I just destroyed my old cylinder, I got another stocker, and ported it. Porting was a tiny bit differrent this time (intake side of the sleeve) and the bore is smaller.
Yet, the jetting didn't move an inch. :biggthumpup:

 

[x-jetter]

ok i'm definately having some sort of issue, maybe related to the ns. every time i land from a couple feet up, whether it be 'pancaked', on the nose, or on the side, it acts like it just swallowed a huge gulp of water. i have to floor it for like 10 seconds to get it to clear out. i'm still waiting on the 2.0 ns, so once it gets here i'll switch it out and see if that fixes it.

 

[Matt_E]

What's your popoff? Your N&S may be shaken enough to dump fuel into the carb throats.

 

[x-jetter]

i've got a 2.3 ns and 115g spring, but i don't have a popoff gauge so i'm not sure the actual numbers. the mikuni manual estimates it at 20-22 psi. i'm thinking that your right and the new ns may fix it.

 

[Big Kahuna]

ok i'm definately having some sort of issue, maybe related to the ns. every time i land from a couple feet up, whether it be 'pancaked', on the nose, or on the side, it acts like it just swallowed a huge gulp of water. i have to floor it for like 10 seconds to get it to clear out. i'm still waiting on the 2.0 ns, so once it gets here i'll switch it out and see if that fixes it.

hmmmmmmmmmm, mine is doing that, let me know what you find!!! I figured it was water...........

 

[Mark44]

f

hmmmmmmmmmm, mine is doing that, let me know what you find!!! I figured it was water...........

Same here. Hmmmmm............
2.0 N/S 95 Gram spring

Mark44

 

[Matt_E]

I had that problem....however, it was related to a bad primer bulb.