waxhead
wannabe backflipper
- Location
- gold coast
cool
let me know how you get on
let me know how you get on
Tuning dual 44's - couple of questions
- Thread starter Matt_E
- Start date
wildman326
Who else?
- Location
- Kansas
I've got the 120 low 100 high (or thereabouts) jet set-up, and all spring sizes, and the needle and seats, and the next time I'm out and the weather is good I'll try them again.
I think there is something funky about using this intake/carb combo . . . the whole thing was designed to attempt to emulate fuel injection. At least that is how it was explained to me when I asked about it.
I honestly am not very experienced at setting up carbs, at least I don't have much confidence. In the past I've just robbed someone elses set-up and gone with that. I'd like to be better, but I feel that I need more info. A tutorial. Step one, step two, etc.
I think there is something funky about using this intake/carb combo . . . the whole thing was designed to attempt to emulate fuel injection. At least that is how it was explained to me when I asked about it.
I honestly am not very experienced at setting up carbs, at least I don't have much confidence. In the past I've just robbed someone elses set-up and gone with that. I'd like to be better, but I feel that I need more info. A tutorial. Step one, step two, etc.
wildman326
Who else?
- Location
- Kansas
OK. So I blew an oring today. And all my spares were at home. These carbs go straight through the roof! Any reason that these carbs would make me blow an oring?
It hits hard and intantly. I fear that it raps out quite quickly.
It hits hard and intantly. I fear that it raps out quite quickly.
wildman326
Who else?
- Location
- Kansas
No, the 112.5 low, 102.5 high, 2.3NS, & 65gm spring, with the doubled up fingernail thingies and 70 jet in the return.
waxhead
wannabe backflipper
- Location
- gold coast
yup 120 low
100 high
2.3 n/s and 80 gram springs
100 high
2.3 n/s and 80 gram springs
waxhead
wannabe backflipper
- Location
- gold coast
its about the pop off
try for 15-165 psi pop off
its vital that you check the pop off
try for 15-165 psi pop off
its vital that you check the pop off
waxhead
wannabe backflipper
- Location
- gold coast
Matt_E said:
i knew you would
i would be trying for about 15-16 psi
once the pressure gets up it doesnt matter the 1-2 psi difference but at 20 psi then its a 5% difference between 1 psi and even more as you get lower
thats alot of fuel
wildman326
Who else?
- Location
- Kansas
Well, isn't this interesting!! I'm going to try the 80 gram springs. I must say however that if I recall the set-up now 2.3 with 65 yields 14 lbs pop off.
I just looked into my carbs at idle and there was not dribblige (I just made that word up, fancy eh?)
I just looked into my carbs at idle and there was not dribblige (I just made that word up, fancy eh?)
Alright....here are my observations.
My first time out with the following setup:
2.0 N&S
95g spring
24 psi popoff
125 pilots
122.5 mains
Totally stunk. Way too rich, took forever to rev up and clear out.
I then switched to 117.5 pilots and 110 mains.
A lot better, but still too rich.
Then I dropped the pilots down to 115 (the lowest I had) and left the mains (because the top felt good).
A LOT better. Nice crisp throttle response. I couldn't ride around for all that long, as I had a steering problem.
Today I went out again and changed to the jetting suggested by Jared (Waxhead).
Setup:
2.0 N&S
65 g springs
About 18psi popoff
120 pilots
105 mains
I wasn't impressed. It was definetely too rich. I can't say that it was the lower popoff or the bigger pilots.
Wrenching in the marina parking lot in your wetsuit isn't a whole lot of fun, so I just put the jetting from yesterday back in, as I wanted to do some riding.
I will get me some 110 and 112.5 pilots to try out. I think there's still some room for improvement, though I am pretty happy already with this current setup.
Heck, I may even try Jared's setup again with 115 pilots.
My first time out with the following setup:
2.0 N&S
95g spring
24 psi popoff
125 pilots
122.5 mains
Totally stunk. Way too rich, took forever to rev up and clear out.
I then switched to 117.5 pilots and 110 mains.
A lot better, but still too rich.
Then I dropped the pilots down to 115 (the lowest I had) and left the mains (because the top felt good).
A LOT better. Nice crisp throttle response. I couldn't ride around for all that long, as I had a steering problem.
Today I went out again and changed to the jetting suggested by Jared (Waxhead).
Setup:
2.0 N&S
65 g springs
About 18psi popoff
120 pilots
105 mains
I wasn't impressed. It was definetely too rich. I can't say that it was the lower popoff or the bigger pilots.
Wrenching in the marina parking lot in your wetsuit isn't a whole lot of fun, so I just put the jetting from yesterday back in, as I wanted to do some riding.
I will get me some 110 and 112.5 pilots to try out. I think there's still some room for improvement, though I am pretty happy already with this current setup.
Heck, I may even try Jared's setup again with 115 pilots.
waxhead
wannabe backflipper
- Location
- gold coast
good right up
i am suprised you found that rich
i would try the 100 high more than the 115 low
keep us informed
i am suprised you found that rich
i would try the 100 high more than the 115 low
keep us informed
I don't know Jared...It was rich off idle all the way to the top, without transition. Makes me think that either the popoff is too low or the pilot too big.
As you know, lower popoff can be compensated with a smaller pilot, and vice versa.
That said, and considering how well it ran with a higher popoff (24psi) AND smaller pilots (115), I wasn't surprised to find a lower popoff with larger pilots too rich.
But, I think I will try it again .
As you know, lower popoff can be compensated with a smaller pilot, and vice versa.
That said, and considering how well it ran with a higher popoff (24psi) AND smaller pilots (115), I wasn't surprised to find a lower popoff with larger pilots too rich.
But, I think I will try it again .
Oh, and about you being surprised that that was rich...well, I am, too, in a way.
I was baffled that the jetting I had last year (125P, 122.5M) - which worked at least alright last winter - was so totally unrideable now.
I think my additional porting and bigger bore necessitated more air volume through the motor, faster.
So, the air speed through the carb throats (which stayed the same) increased.
I guess that would mean smaller jets are now needed.
I was baffled that the jetting I had last year (125P, 122.5M) - which worked at least alright last winter - was so totally unrideable now.
I think my additional porting and bigger bore necessitated more air volume through the motor, faster.
So, the air speed through the carb throats (which stayed the same) increased.
I guess that would mean smaller jets are now needed.
waxhead
wannabe backflipper
- Location
- gold coast
fair enough
normally in my boat i would go between a 120-115 low and a 105 -100 high
but on here i am going to err on the slightly rich side
but what ever works for you boat is best of course
keep us informed
normally in my boat i would go between a 120-115 low and a 105 -100 high
but on here i am going to err on the slightly rich side
but what ever works for you boat is best of course
keep us informed
waxhead
wannabe backflipper
- Location
- gold coast
the fact that you have a ski thats now rich compared to last year is showing that your port job is working well and that you have a high airspeed in your engine
well done
well done
I am definetely going to give your approach (lower popoff) another try, at least.
I want to be able to compare different carb setup methods, and find the best combo for my engine.
Though it SUCKS having to take dual carbs off.
I'm getting better at it, though.
I want to be able to compare different carb setup methods, and find the best combo for my engine.
Though it SUCKS having to take dual carbs off.
I'm getting better at it, though.