Dual 46 carbs on a 61x motor?

[JetManiac]

Trying to help a customer with jetting dual 46 carbs on a 61x motor.

Anyone have experience with jetting this unusual setup? He has std pipe and head type mods.

I am thinking this is alot of carb for a 61x motor and will need smaller n&s and jets than the same setup on a 62t motor.

Thoughts?

 

[Davidomilligan]

Ya too much carb. Is he running single pulse too?

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[Big Kahuna]

way too much.

 

[SimonSimon]

Why would anyone want to run dual carbs on X cases? Doesn't make sense let alone 46's.

 

[JetManiac]

Why would anyone want to run dual carbs on X cases? Doesn't make sense let alone 46's.

Dual 38s work well from what I have heard. Not sure about anything larger.

 

[SimonSimon]

Dual 38s work well from what I have heard. Not sure about anything larger.

While I can't attest to 38's, it still begs the question of why he wants to run duals in the first place. Save yourself the trouble and tell him to stick with single carb or swap to T cases. I run a 61x single 44 and I love it. Hits crazy hard and about to hit even harder once I swap in a wetjet kraze mani w/sbn46. Oh yeah!

 

[Forrest McLauchlin]

Trying to help a customer with jetting dual 46 carbs on a 61x motor.

Anyone have experience with jetting this unusual setup? He has std pipe and head type mods.

I am thinking this is alot of carb for a 61x motor and will need smaller n&s and jets than the same setup on a 62t motor.

Thoughts?

While kinda on that topic. Do you have an idea of jetting specs on a hand ported 735 62t with 46's, usual bolt ons and a lay down pipe?


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[x2mafia]

@tntsuperjet

 

[Vortex]

1.5" filter may help get more signal to the oversized carbs. I've ran 48s on a ported 727 for a few years, it works and can pull hard just never quite got it dialed in yet.

 

[tntsuperjet]

125 low
130 high
2.0 needle 95g

 

[JetManiac]

125 low
130 high
2.0 needle 95g

Thanks, for which setup? The one I posted about or which Forrest asked about?

 

[Big Kahuna]

I would guess original question.

 

[bored&stroked]

Why would anyone want to run dual carbs on X cases? Doesn't make sense let alone 46's.

The same reason people run single carbs on a 62t cases I'd imagine.

 

[x2mafia]

Why would anyone want to run dual carbs on X cases? Doesn't make sense let alone 46's.

because were jetskiers and we do stuff that doesnt make sense all the time?

 

[SimonSimon]

What are those so-called "reasons" though and what benefits (if any) in performance are there? If there were truly any noticeable gains from mixing/matching dual/single carbs then I'd imagine more people would be doing it.

Single big carb on a 62T might have its reasons sure but duals on a 61x? That would require some convincing first. Lol


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[SUPERJET-113]

I ran dual 38 Pro-tec Mikuni's on a 6M6, but that was 1993...lol They were tuned so perfectly I didnt even have a return line to tank.

It was also very expensive back then! Same prices as today in fact. I was a young dumb man with credit cards and Riva, Pro-tec, and R&D loved me.

 

[whitca]

What are those so-called "reasons" though and what benefits (if any) in performance are there? If there were truly any noticeable gains from mixing/matching dual/single carbs then I'd imagine more people would be doing it.

Single big carb on a 62T might have its reasons sure but duals on a 61x? That would require some convincing first. Lol


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You don't think 46's on a T case 701 will be over fueling?

Personally, I don't think it matters really on a stock 701...X cases or T cases. When it comes to case porting and aftermarket support then certainly the t cases are the way to go but if a guy wants to throw duals on x cases it will build power the same once tuned (not saying 46's but duals). Years ago I had a buddy throw a jetworks ported 701 cylinder on T cases w/ Art's mod 38's the same time I put a jetworks ported 701 cylinder on X cases with dual 44's. Those ski's ran damn near identical. There was no disadvantage running X cases w/ dual carbs in that situation.

 

[bored&stroked]

Single big carb on a 62T might have its reasons sure but duals on a 61x? That would require some convincing first. Lol

If the case, whatever it may be, can move more air then a single carb can provide, then duals will make more power. Easy peasy. You make it sound like there is only one way to do things.

 

[SimonSimon]

If the case, whatever it may be, can move more air then a single carb can provide, then duals will make more power. Easy peasy. You make it sound like there is only one way to do things.

Didn't mean to come off sounding like there was only one way to do it nor am I bashing on those that currently run this type of setup. My point is that there are far better ways to buy power than thinking a second carb on a 61x will make any noticeable gains. It's doable, sure, but 99% of the time won't be worth the time and effort. And if buying a cheap set of T cases and doing it the right way is gonna break the bank then you're in the wrong sport. But hey everyone's entitled to their own opinion so whatever floats your boat..


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[kevbo]

I have done carb changes on a well known 61x case 701. The stock single 44 needed 50% or more throttle to hit the pipe. It turned 6920 rpm at 47MPH. I installed a dual 44 manifold and sbn 44s. These had to run a little richer in the pilot range for best response and would hit the pipe at 40% throttle. They pulled noticeable harder and would turn 6940 rpm at 47 mph leaned to peak rpm. Later I swapped 62T cases and recorded the same numbers. I would say that 61x cases are not much in the way of small engines turning less than 7000 rpm.