GY6 CV Carb Update

[Wheelman-111]

Greetings:

Advantages:

There are tons of these 24mm carbs on eBay for around $60. Some are Chinese clones, but some are genuine Keihin.

The spigots fit the CT manifolds.

The bystarter connection snaps right in.

A 105 main jet works with the 65cc bore, easily obtained from the Keihin catalog.

It pulls like a freight train.

Fuel mileage is improved over a regular roundslide carb.


Disadvantages:

You need to fab a throttle cable with 4.5" of free pull and a 7mm barrel end.

The 40mm bell mouth needs a filter to fit, won't clear the Aero panel without slicing the priceless plastic.

Jetting at the ragged edge of power production for 65cc is touchy. A 102 main won't allow WOT for long, but a 105 is a bit rich in the midrange.

There's no help but my experience breaking this new ground, and setups vary.

[Kenny_McCormic]

Have you considered some sort of angled filter setup? Or is the carb too big?

[Wheelman-111]

Greetings:

The. CT manifold puts any carb outside the plastic perimeter. My Arreche "Octopus" fiter squeezed on - barely - with plenty of KY jelly and a firm clamp.




Yes, sadly had to slice into precious Aero plastic, but the upside is that panel removal is no longer necessary for carb adjustment or removal.

Now with ported Malossi 65 bore and ample carburetion, it just rips to 55 and beyond but temps get uncomfortably high with #102 supplied. Jetting awaited to see how far. Honda CL 125 jet is 105, and 107.5 is listed in Keihin catalog. One of those should be ideal.

[Wheelman-111]

Greetings:

I found this somehow, somewhere - stashed in old Favorites file.

http://www.drpiston.com/Cvcarbs.html

Despite making a wildly inaccurate statement in the third paragraph - water is a non-compressible fluid and does not "loosen up" like a gas when flowing - the explanations are pretty easy to follow and likely correct.

Still not a schematic of my VE24, but gives a general idea of CV carbs' function.

[bradthreee]

I meant to ask before is that a Dio kicker front half on your Aero motor?

[Wheelman-111]

Greetings:

Curious Cubed axt:

I meant to ask before is that a Dio kicker front half on your Aero motor?

No sir-ree BradThreee! Thet-thar's a 1987 SE50M front half case cover from the Japanese Domestic Market DJ-1. Evidently Honda had an infinite variety of combinations and permutations not sold Stateside. Witness the weird half-05/half-16 reed block from the '88-'89 Elites. Neither fish nor fowl, but fits US-model Aero and Elite AF 05E cases just the same. (I like to think of these weird parts as BarraChickens...) This is just one reason why WHAC welcomes all scooters, foreign and domestic, into the orphanage.

Yea, verily my engine's a righteous AF-05/SE50, which you could see clearly on my tranny case were it not for legendary (bad) Wheelman photography skills. That don't stop it from blowing on by 60 on 65cc.

My goals: 1 MPH per cubic centimeter. 5 Degrees F. per MPH

I'll keep you posted.

[bradthreee]

I'm thinking of cutting mine in half I really am jocking your style

[Wheelman-111]

Greetings:

Half-cover is the way to go. Cooler clutches and that Dioid mystique that excites the girls so. Well, the nerdy ones, anyway...

Sawzall is among Primitive Wheelman Tool Kit.

[adark248]

WIth those results, I'm not even sad you cut the s*** out of that plastic. Want to rebuild my NB50M for me?

[Wheelman-111]

Greetings:

Ms sound like they could be tough to modify. I gather they have a different... Uhh.... Everything!

Piston's 40mm, right? So the crank's gotta be uh, carry the 2... Around 40mm also?

Do you know what the drive end diameter of the crank is? Maybe a Keli variator fits? Then you'd just need RPM.

The bore kits're probably all gone, if they ever existed. Two-bolt manifolds limit carb and intake choices to maybe porting out the case inlets and mani pipe, maybe composite reeds. No exhausts either, unless you can weld your headpipe onto a Biturbo for Tomos 50-70 expansion chamber. With some cylinder porting work maybe o-ringing the head and a bigger back tire, I'm just guesssing, but 50 MPH from 50cc is probably feasible.

[Wheelman-111]

Greetings:

Honda dealer has to get the Keihin VE jets by the 4-pack, so I've got extries. 105 still runs a bit warm at WOT, ordered 107.5 and 110s if anyone needs 'em. If'n the 110 don't work, I'll have to go Nitrous... I hear that cools yer head pretty good. Especially if you huff it.

[Wheelman-111]

Greetings:

Installed the 110 main this evening, skipping over the 107.5. I thought I'd need to lower the needle but it ran better in 4th position from richest.

Good Gawd it's faster! Temps finally under control despite mid-90s here in Deepinnaharta. In fact the only time I saw 375 was briefly after shutting off throttle following WOT runs to 55, which arrived alarmingly quickly on my bumpy test road.

I don't want to risk too speed testing at night; can't see the TinyTach except under street lights. It was purring along at 8500 when I could cop a look at 55.

[adark248]

oooh fancy... what's your end goal? The Kessel run in less than twelve parsecs? thanks for the advice on modding my 84... didn't understand a d*** word of it

[Wheelman-111]

Greetings:

Two-Four, let me know if I can help with your '84. Aerophiliacs need to help one another.

The 110 still flirts with 400 degrees after a minute of WOT, and I'm too chicken to see if its a gauge misread. It holds 50 with ridiculously little throttle. Whack it open at 50 and it just lays down more power and torque, but I won't try it until there's a 115 in the VE24 main channel.

[losthope]

sounds like your making good power.