Carb setting with pods and 4x2 exhaust

I've got a V+Hines header and Ape pods and with the stock cams and 650cc I always ran a 17.5 pilot, clip in the 4th slot and 112.5 mains...... Ran 117.5s and the clip in the 5th with a open air box (top off and the filter out for a couple years (and header too) then I switched to the 29 mm smoothbores from 83 to 2004 or so. Ran them open for quite a while and played with the jetting on them too.... Then Ape pods for them for a while.........At that time the carb holders went to hell and I switched back to the stock carbs.

Now with my set up I have it in the 5th slot on the nettles and 117.5 mains........ air screw one and 3/4.... air screw never seemed like it did much and left it at the reg setting (I think at 11/4 to 13/8s or so) till I got new carb holders and did the bore and small cam. Opening it up then really seemed to help the response off idle............ Have new manifolds for the 29s and am planning on going back to them again next spring now that the rebuild has proven its self to be all good.

Thanks for the info guys !!

After reading 650ed's engineer's statement about air box and exhaust changes, it makes me think about making something to set the pod filters back farther from the carbs.



Assuming I understand his statement, it would be beneficial to extend the pod filters as far back as reasonably possible from the carbs. Of course no farther back, than the back of the original air box. Has anyone ever done this ?? I'm sure the transition from the carbs, through what ever was used to extend the pods, and into the pods, would need to be as smooth as possible. I'm going to see if I'm able to come up with anything reasonable to accomplish this with. If I am, I'm sure it will require more carb jetting to get it to run as good as possible.

I missed the article you posted a link to 650ed. I can see why you feel as you do about those of us that like to alter there bikes exhaust and air cleaners.

I did catch this little tidbit at the end of that article,



This gives me a bit more hope than you are willing to offer 650ed, for someone making the changes like I'm going to be making. I suppose if I had the CV carbs on my bike, I would be running into a brick wall, and be wasting my time and my money. I'm pretty sure all of my past bikes had the slide throttle carbs, as does my kz650, which I'm sure is in my favor.

Thanks for taking the time to try and educate us 650ed. I certainly appreciate it !!

No eBay APP ID and/or Cert ID defined in Kunena configuration,.. it would be beneficial to extend the pod filters as far back as reasonably possible from the carbs

Lengthening the intake upstream of the venturi is what bell mouth velocity stack intake 'trumpets' do, generally pods are pretty close to the frame rails and there isn't much spare length available.


There are no good rules for jet jumping. I see posts like go one up on the main for pods, another up main for less restrictive pipe.


On some bikes that rule of the thumb is a good starting point, on others it is a mile off. My pipe n' pods CV carb 750r1 is 137.5 mains up from 110 ish standard, I would have started a couple of sizes up, but really didn't expect that much of a jump.

Another downside to the cheapo paper and gauze pods is the air filtration quality, holding them up to the light you can see the holes. At about 60 litres a second these motors gulp a lot of air, poor air filtration accelerates piston ring and valve guide wear.

These look quite nice:

I like the idea of extending the pods into the frame. There they won't be effected by the air moving past them and the vortex created by it.As it was explained to me, the frame becomes pressurized at speed, thus allowing more air to be available.
Steve

swest wrote: I like the idea of extending the pods into the frame. There they won't be effected by the air moving past them and the vortex created by it.As it was explained to me, the frame becomes pressurized at speed, thus allowing more air to be available.
Steve

Steve you're a fabricator of sorts, why don't you build a retail kit for something like that using extension tubes, smaller pods and shove them up their near the battery box?

The lengthening or shortening of the intake is referred to as pulse tuning. This is much like the tuning with the primary pipes in the exhaust system.

I would suggest that you keep in mind that in general :
shorter intake - more top end
longer intake - more low end

I was thinking something like the oval pods with a short extension. But you wouldn't see them. That's what they want isn't it? To see them? :whistle:
I for one will stick with my air box and cool blue silicon boots. :lol:
Steve

I'm less interested in seeing them ... as I am in the engine running correctly!

That's the selling point even though they can be hard even impossible to tune correctly. Our VM carbs are easy compared to CV carbs.
Steve

Since the rebuild with the Wiseco 10.25 Pistons, I'm seriously considering putting my old KZ air cleaner assembly back on. I can tell the pods are going to give me trouble and the fresh top end is really amplifying it.

If you want to keep the pods, you can try the next size up on the nozzles and needles. Sometimes changing the slide cutaway will help you find that "sweet spot."
Steve
Check out Mikuni USA. Lots of info there.