POLL: Best carbs for ported 701-760?

[Yami-Rider]

Our JM 781's ran great with OEM 38s. I'd stay dual 38 till you go over 800cc.

 

[JetManiac]

I'm trying to convince Prosouth to save money on aftermarket carb and single intake and just get OEM 38's. I don't think it's worth the money to go to a single.

I agree with you on that. Sgl carb 62t a/m mani and carb are expensive compared to dual 38s. But there are some who swear by the sgl carb on 62t motor setups.

 

[Storbeck]

@JetManiac how do you feel about single carb manifold on 62t vs 61x?

 

[TheBuzzard]

if every carb setup you have on your list is perfectly tunes for that motor, no single carb setup is going to perform as well as the dual setup. the bigger the duals, the higher the motor will rev. the bigger the carbs, the more throttle response/bottom hit you lose. stock dual 38s were designed for a stock 701. I would go with stock dual 44s off a 760 motor. use the stock carbs, intake and reeds. its a dirt cheap setup that I have seen increase power over single novi 48 setups and dual 38 setups

 

[Vortex]

if every carb setup you have on your list is perfectly tunes for that motor, no single carb setup is going to perform as well as the dual setup. the bigger the duals, the higher the motor will rev. the bigger the carbs, the more throttle response/bottom hit you lose. stock dual 38s were designed for a stock 701. I would go with stock dual 44s off a 760 motor. use the stock carbs, intake and reeds. its a dirt cheap setup that I have seen increase power over single novi 48 setups and dual 38 setups

That is true I noticed more rpm with Novi 48s vs 38s. However at that same time I added a 84mm nozzle. Between those two mods I got 300 more revs

 

[McDog]

Everytime I have tried bigger carbs on this size engine, they have never felt as good and well tuned as 38's.

 

[Big Kahuna]

I competed in 2004 with a Single Carb Conv that worked really well. It did not like to cruise up the lake. And do not, do not run out of gas, you will stick a piston in a heart beat on a ported motor. Keep in mind this ski was setup up for flat water freestyle. Shortly after Nationals I swapped back to a set of Dual 44's. The single was good, but it required constant tuning. Stoyer was running the exact same motorsetup and carb setup (TLR Porting and carb mod).

 

[bored&stroked]

If its 61x, a single 46 is best all around.
If its 62t, dual 38's are best all around.
Either setup will feed a stock 701 up to a ported 781 just fine, and that covers 90% of the riders out there.

 

[ProSouth]

There’s no turning back. I’ve got a single 62t manifold now.

 

[Vortex]

Threads like this have one problem, no one has any data to back up claims...everyone says 38s are better and I agree for freestyle where throttle response is key.

Novi 48s on a ported 727 with a bpipe got me 0-30mph in 1.3 seconds. Measured with radar gun linked to a laptop. 48mph. Low pitch impellar. Don't have any numbers for 38s but i sure would like to find out and compare.

 

[aero92x]

Me and my buddy have same hulls, pumps, prop, porting, ignition... Mine had dual 38s (Tapered Bored) and he had dual OEM 46s on his 735. Well, the 46s pulled much harder in the surf. Like this would help ya'll...

 

[Quinc]

Dual oem 46's. I believe @waxhead and groupk talked about how the 46's are significantly better (signal responce and flow) then the sbn 44s.

 

[Storbeck]

Dual oem 46's. I believe @waxhead and groupk talked about how the 46's are significantly better (signal responce and flow) then the sbn 44s.

I think you mean oem as in not Buckshot or Novi or some such? It can be confusing because some people distinguish between the 44's that came on the yamaha 760 as "oem" where 44's that you buy from mikuni that didn't come stock on any machine are different and somewhat more desirable. So "oem" can mean unmodified from Mikuni but never came on a ski, or "oem" could mean it came as oem equipment on a ski.

 

[JetManiac]

Dual oem 46's. I believe @waxhead and groupk talked about how the 46's are significantly better (signal responce and flow) then the sbn 44s.

I think you mean oem as in not Buckshot or Novi or some such? It can be confusing because some people distinguish between the 44's that came on the yamaha 760 as "oem" where 44's that you buy from mikuni that didn't come stock on any machine are different and somewhat more desirable. So "oem" can mean unmodified from Mikuni but never came on a ski, or "oem" could mean it came as oem equipment on a ski.

Exactly, if talking about carbs from Yamaha for 701-760, there is no such thing as 'dual oem 46's.'

Dual 46's are Mikuni a/m single 46's modded into a dual carb setup.

 

[Quinc]

I think you mean oem as in not Buckshot or Novi or some such? It can be confusing because some people distinguish between the 44's that came on the yamaha 760 as "oem" where 44's that you buy from mikuni that didn't come stock on any machine are different and somewhat more desirable. So "oem" can mean unmodified from Mikuni but never came on a ski, or "oem" could mean it came as oem equipment on a ski.

Mikuni OEM and not Yamaha. I think only 46's that yamaha had where the gp1200/1300 I series.

 

[waxhead]

dual 46s are better than stock oem 44s or any 44 system out there. I would always run 46 over 44 if i have a choice. If you take the time to set them up correctly you will get a bigger hit out of them.

 

[Kaylee.S]

Im running AM 44 sbn's on my 800 dasa, setup exactly like my 46's on my big motor. She runs great! I even ran the 46s and 44s back to back on the baby dasa, I can't feel a bit of difference.

If single 62t intakes were more readily avilable and I didn't already have my boyesen intake...I would have gone single 46.

 

[Half flip95]

dual 46s are the best when you're wide open but pointless if you're chocolate fingering around at half throttle

 

[waxhead]

Every one is entitled to their opinion based on their own testing. Lot of different thoughts is what makes the world go round

 

[Big Kahuna]

Every one is entitled to their opinion based on their own testing. Lot of different thoughts is what makes the world go round

And every setup while may be almost the same will be different