Sbn 3 hole or 4 hole!?

[Stefanko135]

Ok looking for a carb for my kawi 650 sx and just which one!? I posted in general for the main question what types of sbn 44 carbs are there. saw an old post but would like to know more? What is better the 3 hole or 4 hole both 44 also put into play my mostly stock 650 sx looking to pipe and get a head, to help with the decision on the one I should get thankss

 

[SUPERJET-113]

All SBN 38's have 3 bolt holes, SBN 44's have 4 bolt holes, even the old BN's.
Look for a SBN 44, but you'll have to get a different intake manifold. You can also find a Keihin 42 and bore your existing manifold out to accommodate it.

 

[Stefanko135]

No oops I mean the little holes under the throttle plate in the bore of the carb and yup will be needing a new mani!

 

[eastcoastjumper]

Get a 4 hole sbn. More holes for throttle position circuits makes easier tuning across the range

 

[Stefanko135]

What are the holes even for??

 

[tor*p*do]

fuel delivery

 

[Stefanko135]

So 4 hole is better than 3 still talking 44 of course and differences in them basides how they tune? and flame arresters options? Stock or maybe go prok, blowsion?

 

[tor*p*do]

stock f/a FTW

 

[SkiPro]

Don't old kawis breath threw some weird stone?

 

[Stefanko135]

Thought so! And huh kawis are pretty similar to Yamaha's f/a just a different shape pretty much

 

[Stefanko135]

Other question my buddy says he has a mikuni 44 just it's off a triple still work? I mean why not? Just the fuel inlets where the fuel lines hook up are different. found replacement 90 degree ones anyone ever change them I think they just press in

 

[kurtwolff]

You'll need to change the shaft but it will work...

 

[waxhead]

They are called progression ports and they are there to fill the hole in the mixture between the idle circuit and moving to the booster.
You will be fine with either one. Just dont mix them up ir run different ones as a set of duals

 

[Stefanko135]

Hard to change the shaft and why? Also anything on the fuel inlet where the fuel lines hook up on the carb and replacing them?

 

[BruceSki]

They are called progression ports and they are there to fill the hole in the mixture between the idle circuit and moving to the booster.
You will be fine with either one. Just dont mix them up ir run different ones as a set of duals

I've seen that before. One 3 hole, one 4 hole. Drove a buddy nuts for a whole season til' he realized what somebody did to the ski.

 

[Yami-Rider]

Hard to change the shaft and why? Also anything on the fuel inlet where the fuel lines hook up on the carb and replacing them?

Your throttle cable may not work with the triple linkage, that's why you may need to change it. As long as there is a inlet and a restrictor in the outlet, you should be fine.