Blaster Single 44, VS single 46 VS dual 38s?

[ChrisFiore15]

B1, with a 701 61X engine in it, hooker prop, bored nozzle, RIVA pipe..

Right now it has a single 44.. runs awesome...
I have single 46 sitting here..
and a manifold and a set of dual 38s..

Which is best... Is it worth changing out the dialed in 44, or just keep it as it sits?

 

[Philip Clemmons]

If it ain't broke don't fix it lol. With minimal mods like you list, you likely won't see much difference. I'd keep it simple unless you like to tinker, because there is magic power there IMO.

 

[Big Kahuna]

leave the 44 on there, just make sure it is tuned properly.

 

[js/sj]

Install those 62T cases that you are selling, Then the dual 38's...

 

[MADMAT]

Install those 62T cases that you are selling, Then the dual 38's...

x2..

 

[motozachl]

I remember talking to Art a while back and he told me back in the day when the duals came out everyone was running them because you know more is better. But then he said he was still stomping people in races with the single 44

 

[kieran79]

I installed a new 46 mikuni on my blaster and had the intake ported to match and found a big difference but maybe my 44 wasn't tuned right

 

[js/sj]

Yea but ive also seen 650's beat 701's. Doesnt mean one platform is better than another.

 

[Vumad]

I don't understand why you'd be selling a 62T case, while running a 61X case with a single carb, and ask if the dual carbs are better.

If you care what is better, you'd be asking about the cases you have too.

If reliability, price and etc are most important to you, leave it alone.
If almost negligable gains on the bottom with barely noticable improvements on the top are important to you, at the cost of price, ease of maintenance and reliability are important to you, switch.

Dual carbs are better for peak horse power. Smaller carbs are better for fuel economy. The only reason to switch to the 38s is to save gas at the expense of more headaches.

I'm switching my X2 from a 750 single 44 to a 750 dual 44. I'm racing it, no discussion. If it were a surf boat, then I would keep the single 44.

Edit: Really, the main thing dual 44mm carbs are going to do for me over stock 800SXR 40mm carbs is going to burn more gas for a tiny bit more power. I really don't have the kind of displacement needed for the dual 44s, but it's a step in the right direction for me. Who knows, I may switch back to the single or find a set of SXR carbs.

 

[ChrisFiore15]

On the note of 62T cases... the set that was sold.. wasn't my last set.. there still one or two more sets of them here...
but not the point...

Im talking about dual carbs on a 61X bottom end..

And because this is my girlfriends B1, I don't really want to yank the entire motor apart.. *knock on wood*, motor has been running great for me, and don't want to go that deep into splitting cases and all that. That falls under the "its working, don't touch it" category.

I had a set of dual 38s sitting around.. a dual 38 manifold...
Also had sitting around a single 46...
Its amazing what you find when cleaning out...

So just wanted some opinions as to what other peoples experiences were with similar upgrades to decide if its worth it or not.


Thank you everyone for the opinions!

 

[ChrisFiore15]

Here she is

Here is here ski!

 

[BruceSki]

I ran a set of dual 38's on a 61x case in a blaster and thought it made more power than a single 44 with about the same fuel consumption once we got it dialed in. Took about 3 sessions of carb tuning to get it right though. I was running a pro tec dual 38 manifold with 61x/61x motor.

Dual 38's sip on gas just like a single 44. Go dual 44's, 46's, or larger and let me know how fast you are pulling out your tow rope cause you are out of fuel. I haven't seen a large enough power increase to go to giant carbs for my application and unless your girl is flatwater flipping and rolling that blaster I can't see her needing that either. Now monster motors for flat freestyle is a different story.

 

[BombThreat]

As others have said, keep it as-is and run it with the 44. It will be simple, reliable, good on gas, and still quick. Also the perfect boat to run in Spec on the NEWA series:Banane09:

 

[ChrisFiore15]

So much awesome info here!!

And yes BombThreat- Im trying to get her to come out and race!
Looking forward to riding some buoys in the spring time on my B1 1200!.. Currently building!

 

[ANT]

I ran dual 38's on 62t cases with a stock 701, b-pipe, mod chamber, jetworks valve, 35mm domes, msd enhancer, skat prop with tbm cone. Then I ran the same exact list of mods on 61x cases with single 44. Once I got the carb dialed in and the pipe adjustments set right, they felt just about the same to me. I ride mainly surf, and not the kind of surf riding where you idle around and wait for waves to do rolls and stabs off of all day, I keep it moving up in the midrange. So, honestly I don't think there is enough of a gain, if any, by switching to dauls. In all honesty I haven't ridden anything under 800cc's that has impressed me enough to encourage me to from changing from that setup either. If you get into bigger motors or are bouncing off the rev limiter around buoys all day, that's probably where you will see real gains from dauls. A 46mm carb might give you a little edge, but probably nothing to go crazy about.

Let me just say to that I judge everything off of the "seat of your pants" feel and not by what a motor "should" pull like.

 

[Nuklear6]

A lot of good info above. I have run all three carb set-up s on 61x cases. my 38s were on the same pro Tec manifold. 46 single on a 701is minimal to no increase in power with a great decrease in fuel economy. 38s were also minimal power increase on the 701but actually got better fuel economy then even the single 44 did for me. single 44 is def the easiest and power is so close its even hard to say either of the other options are any better at all.

 

[imabadfish]

I have 61x with a 44mm blackjack carb. To get more out of it I also went with the wetjet manifold and carbon tech reeds. I had to widen the holes slightly on the 44 carb to get it to fit but I noticed a difference in performance from the stock manifold and don't drink gas like the 46mm would have

 

[ChrisFiore15]

This thread has some seriously awesome info! Thanks everyone!