I replaced a dyno-jet setup, (needle/light spring/drilled slide/jets), with a CVP needle and emulsion tube, jets, new slide, stock spring. (‘97 FLHR)
I am ape sh*t happy with the results. The bike has never run better and I’m getting gas mileage of 48-52 mpg. In the past I usually got 40-44 mpg on the dyno-jet setup.

 

Damn, Id like to get mileage like that. '98 Dyna, EV13 cam, 46 pilot, 185 main, unknown aftermarket needle, Big Sucker and Python slip ons. I get a consistent 35 mpg and bike runs great, Got about 45mpg before mods. Would an out of adjustment float cause bad mileage?

 

I’ve got a 45 pilot, 185 main, EV13, CVP emulsion tube and needle, a screaming eagle air cleaner and Kerker slip on mufflers. Sure sounds like the same setup as yours, somethings got to be up... unless you’re always running 85 mph up hill!

 

Forgot to mention, Im a pretty conservative rider on the Dyna, Ive got a worked, rigid sportster when I want to rip it.

 

There are at least 4 versions of the HD CV carbs, First was 27xxx-88, no pump. Then the first 1340 and XL version with pump 27xxx-89. Later was the 27xxx-93, then 27xxx-(96 or 98) used on 98 up and TCs. First used 65 series needles, then 70 series, 80 then single digit series (N0, N9, N8 etc) respectively. Someone please correct me if I'm mistaken.

Never can get the multi-quote thing to work, so I'll plead ignorance... again.

---------------------------------

0maha
Do you know, remember or still have the needle that you took out, And, do you know what version/revision carb you have (or year)?

Kabear
There were many versions of SE carbs over the years by different manufacturers. I could be wrong but don't think Kehein made a CV for HD until '88. If there's a tag on it (left side near intake spigot) that would tell the tale. I had had similar issues with the air screw until I figured out it has little to do with anything other than idle with a totally closed throttle . The low jet is what does the off idle - low speed and normal speed mileage thing. I get 3-4 more mpg with a 48 over a 45 and much more consistent take off response. And yeah, I tried every spring they make and always went back to stock. Works best every time.

GoGoBeck
I tried all the trick stuff too and could get lots of power in 'some" rpm ranges but never consistent speed at identical throttle openings or decent mileage with any combination. Yours being '97 I don't know what version of carb you have but sure would like to know. Congrats on the good outcome!

Rt13MFer
46 is either a totally aftermarket production or copy of a size for California bikes which was never spec'd in anything I can find. Aftermarket unknown needle is probably your mileage killer, that and maybe the spring. You carb should have the late version of needle like N0KK, N9EA something like that - N(single number)(2 letters) if you ever try to get it better.

----------------------------------------------

I'm sure the pilot air jet (bottom left hole) is different between the carb versions and obviously all the major hard parts are interchangeable and identical but from responses, playing and reading what little there is out there any more, and after a lot of wasted time, I'm starting to believe the other drillings may be somewhat different among the versions. My 27xxx-93 carb likes the 80 series needles but a 60, 70, or single number just will not tune out to any satisfaction no matter what I change.
That was my reason for this thread. An effort to see what version of carb the CVP Performance Needle was best suited in. They claimed "extensive testing" but never told what version of carb they tested...

 

I didn’t know there are different versions, other than size, mines a 40 cm. I looked at my carb (on the bike) and didn’t see any part numbers... it has a raised bar & shield and Harley Davidson on two sides.

 

Yeah, they don't all have one. Your bike is '97 so I'm assuming it's a late version carb. And, I'm guessing that's the version they used to develop their needle. If we knew what needle was taken out originally, maybe we could know for sure. Again, glad to hear the new parts got your bike like you want it

 

Setting aside the possibility of some previous owner changing things around, mine is off a 1990 model year Electra Glide. I've probably got the needle stuck away somewhere.

 

Thanks 0maha,
If you trip across it sometime, let us know. If it's an N72(x), which should be for the early '90s version, that would help verify some of the sketchy research I've been able to do.

 

Here is at least the spec for the N65C.