Tuning dual 44's - couple of questions

waxhead

wannabe backflipper
Location
gold coast
i like to run my top screws out at about 1 turn
it makes them rev harder up top in my op
well it shows up on the tacho anyway

and it makes the last 1/4 of the throttle work better

i find that 1/4 of a turn is about 5 in a jet size
 

Matt_E

steals hub caps from cars
Site Supporter
Location
at peace
This thread is great....a cool tuning conversation between the three of us, spread out over 8 pages. :Banane01:
 

Matt_E

steals hub caps from cars
Site Supporter
Location
at peace
Which setup are you referring to?

Both jets, both adjusters, and the popoff all play into the fuel delivery. If you drastically lower your popoff, up the low speed jet, you can go down that much.
 

freestylegeek

waiting...
Location
Grand Rapids, MI
so... what specs has everyone settled on?

115/100/2.3/65 and 1 turn out on top and botom screw.
(Low/High/Needle&seat/Spring)

That is on:
Stock (connected) flame arrestor (with 2 screens removed)
Duel OEM 44's from a waveblaster II
Matched OEM intake manifold
V-force delta II reeds
3mm angled reed spacer (modified RIVA)
Ported 62t cases
85mm bore Lamey cylinder w/ Honda/Lenzi porting
Wiesco Kawasaki flat-top pistons (ceramic coated top and teflon coated sides)
ADA/Magoo girdled head with custom cut flat top domes (183 psi)
Factory 'b' pipe with mod chamber
61x stator (3 degrees advanced) w/ lightened flywheel
62t CDI (rev limiter removed)
 
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Matt_E

steals hub caps from cars
Site Supporter
Location
at peace
A bit of an update for me.
I was (up till yesterday) running 95g springs, 2.0 N&S (25psi popoff), 112.5p, 125m.
I had been having trouble with getting going right off the boat launch. Once I got going it was all good.
Additionally, lately the ski's been loading up like crazy after some landings.
I decided to up the popoff pressure to 32 psi (via 115g springs).
As I had the boat in the water idling, I noticed that my rear carb is dribbling. I find this a bit troubling, as the popoff is high enough for this not to be caused by vibration.
Additionally, the needle looks good (almost perfect!) - it's less than one year old.
Anyways, I tuned it the way you're supposed to this time around.
I let the boat idle in the water and adjusted the low speed adjusters on both carbs evenly until I obtained the highest possible idle.

By then, I found my pilots too lean - a quick pull of the throttle had the engine hesitate big time and even die.
So, I put in 115 pilots, and repeated the low speed adjuster procedure I just described.
After that, I took it for a spin. Runs nice! A bit crisper than my previous setup, and quite a bit crisper than the last time I tried this combo.
Note that I didn't mess with the low speed adjusters the last time I tried the combo.
I am pretty happy with it now. The loading up after landings seems to have gone away, even though the carb still dribbles at idle (not much).

I can feel a very slight hesitation right off idle. The popoff may be too high, so I might up the pilot still or lower popoff and repeat my tuning.
 
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