Super Jet Trying to decipher carb terminology

[Waternut]

I've got a set of carbs off of a 760. They are the 3 hole version I believe so I know they aren't the best and I plan to upgrade but it's what I've got right now so I'm trying to make them work. I'm trying to get a starting point for jetting on my big bore motor with ported cases and having a tough time trying to figure out what carbs people have. I'm usually pretty good with tuning once I get close but when I'm more than a jet or two off, it's pretty much a guessing game for me whether it's even lean or rich.

I've seen OEM, stock, 760, XL760, retail OEM, and a few more that I can't remember right now. Just trying to figure out what I have and how that compares to some of the other non aftermarket 44 carbs carbs.

 

[BruceSki]

A set of 4 hole 44's will be much easier for you to tune.

 

[Matt_E]

The Mikuni manual has some part numbers in it.

 

[Waternut]

A set of 4 hole 44's will be much easier for you to tune.

That's what I keep hearing. I just have the 44's right now and until I can get some aftermarket carbs or even some of the 4 holes carbs, I'd like to at least try these out. Is the jetting going to be drastically different between the 3 hole and 4 hole carbs?

 

[BruceSki]

Not sure. I never messed with them. The guy that helps me with my jetting issues won't even touch them though. They get a bad lean spot between the two circuits and it is very hard to tune away is what I heard.

I have a set of 4 hole 44's on my 701 and they hit great. I think that ski actually drinks a bit more gas than my 865 though lol. It has giant low speed jets and a big needle and seat with low popoff.

What manifold are you running?

 

[Waternut]

Not sure. I never messed with them. The guy that helps me with my jetting issues won't even touch them though. They get a bad lean spot between the two circuits and it is very hard to tune away is what I heard.

What manifold are you running?

I experienced that funky spot between the circuits that was tough to tune out as well on my last engine. I'm running the 760 manifold. Maybe I'll start really looking for some other carbs. On my short hull, I know I'm going to want a smooth transition when I go to Daytona.

 

[BruceSki]

Yeah. That 760 manifold will work well, you just have to find a better set of carbs to work with. The nice thing is that whole top plate is removable on the 760 manifold.

 

[SUPERTUNE]

It's not just that the oem 760 44's have 3 hole carbs, it's 3 hole carb AND the #160 throttle plate!
If you pair up a set of 61X singles, they have the 3 hole carb, and they use the standard #120 throttle plate just like the retail 44's and 46's. In order to use them you need 1 throttle shaft kit for the drive carb (extended for the coupler), and if you use a short spread manifold, you would need to change the straight fuel fittings to 90* ones. These would work ok, not as easy to jet as the 4 hole carbs, but nothing like the #160 plate 760 carbs. Been there done that.

 

[ryan]

It's not just that the oem 760 44's have 3 hole carbs, it's 3 hole carb AND the #160 throttle plate!
If you pair up a set of 61X singles, they have the 3 hole carb, and they use the standard #120 throttle plate just like the retail 44's and 46's. In order to use them you need 1 throttle shaft kit for the drive carb (extended for the coupler), and if you use a short spread manifold, you would need to change the straight fuel fittings to 90* ones. These would work ok, not as easy to jet as the 4 hole carbs, but nothing like the #160 plate 760 carbs. Been there done that.

what he said!!

 

[waxhead]

Sell me your 760 carbs. I love them