44mm carb transfer holes ?

[blaster800]

I have 2 sets of 44 mikuni ... one set has 4 transfer holes in the bore and the other set has 3 transfer holes in the carb bore and which would be the preferred carbs to use as a dual set... and why is there a difference in these carbs

 

[Sasquachcrap]

One set must be a retail set the others are a OEM set. I don't remember which is which. The retail set are "supposed" to be more tunable.

 

[Quinc]

the one with 4 holes with also have 90 degree fittings. They are "Mikuni" where as the 3 hole are "OEM/Yamaha" Mikuni's.

 

[waxhead]

As a matter of interest the holes are called progression ports, It doesn't matter if you call them transfers every one knows what you are talking about. im just an ex automotive tutor

 

[orangefinger]

4 holes better....( .progression holes, transfer holes etc )

 

[waxhead]

Yes I would expect the more holes will give a smoother power delivery off the bottom. If I had three hole carbs I would not be out buying 4 hole looking for a massive hit or in fact anything you can really feel. If I was buying new I would be looking at 4 hole, actually no I wouldn't, if I was buying new 44s I would be buying new 46mm. They are a much better carb

 

[holjen77]

650 carb 4 hole. 701 3 hole. At least from what I have seen from skis I have worked on. OEM carbs are marked 61x/6M6/etc.

 

[blaster800]

Thanks for the input everybody ! I have used the 4 hole very successfully on an lpw motor i had in the past and it screamed with never a hiccup ... so i think ill go back to the 4 hole 44's again . I am presently using dual AM mikuni 46's on a team scream bb 771 and am constantly fighting them with lowend hesitation ...... so im going back to my proven carb setup that worked for me .... it makes me think more is not always better in carbs anyways . thanks for the input

 

[waxhead]

wtf stay with the 46 mikunis and get them tuned

 

[Quinc]

Thanks for the input everybody ! I have used the 4 hole very successfully on an lpw motor i had in the past and it screamed with never a hiccup ... so i think ill go back to the 4 hole 44's again . I am presently using dual AM mikuni 46's on a team scream bb 771 and am constantly fighting them with lowend hesitation ...... so im going back to my proven carb setup that worked for me .... it makes me think more is not always better in carbs anyways . thanks for the input

I just finally got my 771 tuned with 48's. Try lowering your pop off to 18 and slowly work your way back up. Also reserve jet. I am running a bpipe mod chamber.

 

[blaster800]

I will try again before removing them completely to see if i can dial them in .... just got frustrated last season FYI they are reverse jetted ,b-pipe,enhancer,180 psi, totally rebuilt carbs with plates shafts gaskets n&s, double check valves ,clean filters , etc. full spec intake and reeds, and thx for the motivation !

 

[jo5hi3]

Thanks for the input everybody ! I have used the 4 hole very successfully on an lpw motor i had in the past and it screamed with never a hiccup ... so i think ill go back to the 4 hole 44's again . I am presently using dual AM mikuni 46's on a team scream bb 771 and am constantly fighting them with lowend hesitation ...... so im going back to my proven carb setup that worked for me .... it makes me think more is not always better in carbs anyways . thanks for the input

Make sure someone didn't drill the returns of your 46's.