Surf use - OEM38s Vs. OEM 44s

[SkiDaddy]

I've been following the single vs. dual debate, but need to clarify the difference between dual OEM 38s VS. dual OEM44s, both w/OEM FAs. I've heard that the 44s hit harder, and are thirstier. But I don't know specifics.

On a ported 701, B pipe, 180 PSI engine, what are the differences off idle? At what throttle opening do the 44s hit harder? Is it a smooth rush? And how much thirstier are they? Is top end better?

How much more finicky are they on jetting, and how much more fine tuning do they need for seasonal changes?

TIA!:biggrin:

 

[Matt_E]

Meh....the 44 is supposed to be the better carb. But really, I couldn't tell much of a difference going from 38 to 44.

But, I am bad at noticing [small] increases in power.

 

[Frosty]

I'm hoping not too much of a difference... I am running same set-up SkiDaddy and Paul is going to be porting my 701 cylinder soon.

So I am hoping that nobody comes back and says there is a major difference... cuz then I'd have to spend more $$ and get my 44's.

 

[Idok]

yo bob:

both my boats
butti's blaster and camo ski
E's B1



all single carb.......i LOVE the snap my square motor has (its in the red ski now)...2 of them are T cases with single 44's





i won the auction at the freeride for some magoo HP (port job on 701), and am going to try and run it with a single 48..going to ship it to paul with the cyl for him to check it out...it is a WCF mik 44-48 conversion..

 

[Matt_E]

Yeah, but the man was asking about dual 38 vs dual 44. :biggrin:

 

[Idok]

Yeah, but the man was asking about dual 38 vs dual 44. :biggrin:

arent you supposed to be at WORK yet!?!??! :biggrin: :Banane01:









and bob sholdnt even be messing with his boat.....of any std. ported regular old 701 ive ridden bobs hits the HARDEST...

 

[Matt_E]

I AM at work, Dork. :arms:

(Still working for FEMA!)

 

[robertg]

Last summer I had the same setup as yours. I went back and forth between Pro Tec taper bored 38's and dual Novi 46mm. I couldn't feel a power difference. I actually liked the 38's better because it didn't load up when I tipped it over.

 

[Robert]

Bob-
I may have a little insight here. The superjet I bought came with dual SRE 48's. Low end was not real good, but it was fast topend. They just seems to load up, no matter what low speed jet and adjustments I made. The gain in topend was not that noticable.
Switched to the dual 38's off the blaster that had the choke butterflies removed and were jetted for the factory pipe. Seemed to run great.
I since have switched to a single 46 on the Riva single adaptor for the 62T. It runs perfect now. Seems to be the best of both worlds. I know it seems crazy, because the whole premise of power on a two stroke is to move as much air/fuel mixture through the motor as possible. I guess you could say w/o a port and polish this is what the motor can handle efficiently.
You will have to ride it next time I see ya. It has good bottom end.
BTW- the blaster with the 48's and the dry pipe seem to be the right combo also.
So, after that saga.....
I say single 46. Mikuni states that is the carb for up to 90 hp.
If you go big bore or port and polish in the future you may want the dual 44's
IDOK- I used to run a 750cc ported kawi in an X2 with a single 46. It ran great. But, I think you should do what Paul suggests. After seeing and feeling how Nick's boat turned out.

 

[WAB]

You know after a session in the surf you usually have at least 1/2 a tank left? It would be almost empty with the 44's. :17:
I had 44's on my motor for a little bit, but could not get the bottom end dialed in and liked riding more than tuning, so I put the 38's back on. The 44's made a big difference in top end, but then I have a 62t 701 cyl also......
They did make nice smooth power it seemed, just could not get that immediate off idle jump like the 38's gave.

 

[yamaslut]

for all you 38mm lovers... I got a set for sale at the house w/ manifold and everything... ready to bolt on :cool2:

 

[Idok]

Bob-
I may have a little insight here. The superjet I bought came with dual SRE 48's. Low end was not real good, but it was fast topend. They just seems to load up, no matter what low speed jet and adjustments I made. The gain in topend was not that noticable.
Switched to the dual 38's off the blaster that had the choke butterflies removed and were jetted for the factory pipe. Seemed to run great.
I since have switched to a single 46 on the Riva single adaptor for the 62T. It runs perfect now. Seems to be the best of both worlds. I know it seems crazy, because the whole premise of power on a two stroke is to move as much air/fuel mixture through the motor as possible. I guess you could say w/o a port and polish this is what the motor can handle efficiently.
You will have to ride it next time I see ya. It has good bottom end.
BTW- the blaster with the 48's and the dry pipe seem to be the right combo also.
So, after that saga.....
I say single 46. Mikuni states that is the carb for up to 90 hp.
If you go big bore or port and polish in the future you may want the dual 44's
IDOK- I used to run a 750cc ported kawi in an X2 with a single 46. It ran great. But, I think you should do what Paul suggests. After seeing and feeling how Nick's boat turned out.

oh believe you me......pauls word is as good as gold, and if I were doing a BB conversion I would, but seeing as im staying with the stock sleeves im gonna rock that single carb so long as paul gives me the word after he looks it over...

:Banane35:

 

[SkiDaddy]

First off, I DO occasionally run sustained WOT through the bay (gotta put my little brother's DOO in it's place :biggrin: ) so I need the top end of dual carbs.

IDOK, thanks for the good words. I've since played w/jetting per Paul's suggestions & it's now stronger & smoother.:headbang: :headbang: :headbang: Still not as strong as Nick's, but I bet if I go to a prop like his......

WAB, that's just the answer I was looking for. My porting has a higher exhaust port similar to a 62T cylinder.

BTW, who's riding Vilano Sunday afternoon? :woot:

 

[WAB]

BTW, who's riding Vilano Sunday afternoon? :woot:

I'll be riding h2o this weekend, but it will be the frozen kind and I'll be on a board. :headbang:
catch ya next time.

 

[waxhead]

i put dual 44s on my ski it was running dual 38s before the gain was a more every where

I read that some people were saying it used more gas
this is directly related to the fact that its making more hp
We all went for a long run and my ported ski with a b-pipe and 44s used less fuel than a stocker because it was more efficent
if i was to get up it then it would have used more but it would have been going faster as well

Wad i am thinking you had the 44s set way to rich if you were getting through that much fuel

 

[Idok]

everything should be a go for this sunday bob......11 am in the water, get to the beach whenever you want!



btw, what kinda prop in your boat? not a concord????

 

[orange flattop freestyler]

:biggrin: 48s LOL:biggrin:

Just joking dude,:Banane01:

 

[waxhead]

i have 48s on my race engine they work awesome

 

[orange flattop freestyler]

i have em on my freestyle boat, they work awesome on that too

 

[Jr.]

Here's a little of the skinny, as I see it..... Duel38's-Duel44's

The 38's will deliver pleanty of power for a stock/limited 81-83mm motor. But once you port or alter the cyl, you will be better suited with the 44's.
The 38's will work fine & you would probably never feel much differance, until the 44's are tried. That being said, the 44's have a differant throat design which make it recieve the signal differantly. A properly tuned 44 will be crisp & powerful. for a freeride /FS motor, bottom to 2/3 throttle is where 90% of the riding is done. The motor will simply run the most efficently with that set-up. I have not found a better carb for freeride, the duel44 is it, in it's price range. The very best carb produced for freeride is the 48 Full Spectrum
.................. back on topic.
the 38 will not flow enough for a 84-86mm motor. You can make them run, but expect about a 15-20% loss, compared to the 44's. So, my experiance is, in that application the 44's are mandatory............
The single debate. on a stock/limited 81-83mm motor, using a X case, the single 44 is fine. port that same motoror go to a 84-86mm motor, go to a 46
on a T case, the single 46 is ok, 48 is better, but the case was designed for duels. you are simply cheating yourself of power.

Everyones needs & expectations of power delivery is unique. What I have stated here is my belife based on my work experiance. Some riders will feel they want a softer power delivery & will like a differant option. This is why everyone builds a boat to their liking, & no one is wrong in their belifes or tastes.

Fuel economy? well, if you want to play, ........ ?
Modified motors are hungury beasts........... understand what you are getting yourself into.

ski ya, Paul