Milk's 03 Bullet dual sport build

[AgentX]

Question, since I also like to change altitudes: 

Can CV carbs provide equivalent or near-equivalent performance to standard models?

[barenekd]

CV carbs have worked fine on the bikes I've owned with them, and they are better for altitude changes. My GB500 has one and it works a lot better than the flat slide I put in it. And very well at high altitudes.
Bare

[noisymilk]

Br AgentX

Yeah, I have considered a CV carb for this project as well. If anyone has a stock AVL takeoff they want to sell me, I might try that route as well. I figure, klr650's have been using them for 25 years. They must be good.

We'll see if I can source one, and i'll dial it in as well for mine and others edification.

[jartist]

If you're familiar with the KLR carby you could use a keihin cvk34 from a kawasaki ninja 500.  Probably could be had for $50 from fleabay.  You'd have to guess on the jetting to get started tho.

[Ice]

 I like CV carbs because the continuously variable venturi is always near optimum diameter which promotes intake velocity and fine fuel atomization.

[noisymilk]

Br's Ice and Jartist:

Well, looked around on the interwebs a bit a a CV carb that fits the bill. Found a 30mm CV carb that needs 12V (auto choke, right?) thats designed for scooters. Think thats worth a try? Certainly, CV probably fits the bill long run for what I am trying to do with the bike. There's several mountain passes and the like in my future.

That said, I'm setting out again shortly to try out the PWK30. From what I can tell...this is actually a JRC engineering carb. Because Keihins have a round twist off top, and this one is boxish and take a screwdriver to remove. Also, I manage to bootch up the gasket up there....I made it up with Gaffers tape for now, but already found replacements for a few buck online.

I reset the float height to something more resembling what people say it should be. It was quite low, which would explain the starving at bigger throttle openings I was feeling (admittedly though, it was a brief run with it previously). Started right up and settled into a nice steady idle initially in the garage. Of course...did that before too. Then idle started hunting and seeking all over again.

Still 38 pilot, 1.5 turns out. But trying 128 main with clip second notch from top (second from leanest). I figure starting with the richer jet isn't a bad idea. Don't really feel like blowing up a piston right now.

I'll post back with what I find.

Be safe all.

[Ice]

I think I know the carby you're looking at. Its also available in 32mm 
One just might show up on my go anywhere do anything Bullet some day.

BTW the electric automatic choke is a thermistor controlled enrichener valve.

 The scooterists I have spoken with are pretty pleased with the operation of those chokes.


Wait,,,,,,,do you have one on your green scooter ?

[noisymilk]

Ice -

Yeah, I'm 99% certain there is  CV24 or 26 on my scoot. I am seriously considering going that route (scooter type CV carb with electric choke) for this project. While the carb I got from Br Garbone was likely a good worker for him, I am struggling with it. Was out yesterday....idle would go from stalling to running 2k rpm's sitting there. Once off idle, it seemed good. Odlly...this is how my Mikcarb was behaving previously...then it just sort of got better. Starts great, idles solid. Weird voodoo these things.

And my Mikcarb is perfectly dialed and tuned.

I can source a scooter carb for about $100. I'll think about it.

My next money is on the oil filter from Chumma though. Just gotta get the money now.

So yeah. What does anyone think about truck bed liner for painting the tires?   

I might do it.

Be safe all.

[noisymilk]

Alrighty. So. Which one do you all think.

This:
http://www.ebay.com/itm/Keihin-Carburetor-CVK30-150cc-GY6-engine-/220561887238?hash=item335a835006&item=220561887238&pt=Motorcycles_Parts_Accessories&vxp=mtr

or this:
http://www.ebay.com/itm/Performance-scooter-CVK-32mm-carb-250-VOG-Honda-Helix-/280477095987?pt=Other_Vehicle_Parts&hash=item414dbcd833&vxp=mtr

Oh!!! I found my new turn signals. Check these out! LED turn signal/front flood lights all in one:

Check out http://stores.intuitwebsites.com/hstrial-QualiRegResou/StoreFront.bok These guys have some slick stuff. Pricy, but well reviewed by people I trust.

OK. CV carbs. Lets talk about it a lot. Not interested in ridiculous performance....interested in reliability through a variety of altitudes. Anyone have any better ideas?

It's getting warmer folks....get riding!

[Arizoni]

I don't know much about the model numbers for carbs but it seems strange that something that looks like it might be a 30mm carburetor would be (and I'm quoting), "...suitable for models: Vento, Matrix, Veloce, Baccio, Strada and Wussi 125cc and 150cc+ scooters and ATV".

Does this guy know of a 125cc machine that really uses a 30mm carb?

Also, a $35 shipping fee sounds a bit much for something that weighs maybe 1 1/2 pounds?

At least the second carb is supposed to be good for a 300 cc bike.
Again, quoting: "Performance race CVK quality 32mm carburetor for the 250cc, 260cc, 275cc, 300cc  four stroke chinese scooter/atv buggy engines."

Of course, that is a "chinese" [sic] engine.  Maybe the 500cc Indian engines like them?   

[Ice]

 Our four stroke motors pull air/fuel half as often as two strokes do, hence the carb/engine size references.

[barenekd]

I use to have a 30 mm Amal concentric on a 100cc Hodaka Super Rat in a Rickman frame.  That was one rippin' MX bike even with my 170 pounds on it. I weighed more that it did! I won every race I finished and led every one that I didn't finish. It had a nasty habit of spitting piston rings.
Bare

[noisymilk]

Hello all!

It been a bit, since I had to actually work for a little while. Damn the man.

So the JRC 30mm flatslide will be moving on to greener pastures, along with my ammo can style panniers. I located a Mikuni CVK34 (I think that's the model) that was a stock takeoff from a kawasaki KLX250s. Kid sold it to me for 20 bucks. Very very clean, needs jets. Anyone have opinions on where to start? I am figuring basing it on the BS29 for startesrs with a 15 pilot and a 115 main? Do those numbers sound ridiculous?

If I could just get this scooter sold, I could fund the rest of this project. Sigh. Ifigured it would have been sold by now.

Anyways. There it is for now.

Be safe all. Go ride. Its getting nice again.

[Ice]

Oh CRAP,,,,there is a well respected carb dealer and parts supplier that will gladly tell you the recommended start point for jets and settings for your application.  If I could only remember who they are 

My sincere apologies brothers.

[baird4444]

I don't know if this will help or not...
carb jet comparison chart....;


!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

Width------Keihin # -- DynoJets # -- Mikuni #

0,0540---- 140--------- 130--------- 121,9
0,0550---- 142,5------- 132--------- 123,8
0,0560---- 145--------- 134--------- 125,6
0,0570---- 147,5------- 136--------- 127,5
0,0580---- 150--------- 138--------- 129,4
0,0590---- 152,5------- 140--------- 131,3
0,0600---- 155--------- 142--------- 133,1
0,0610---- 157,5------- 144--------- 135,0
0,0620---- 160--------- 146--------- 136,9
0,0630---- 162,5------- 148--------- 138,8
0,0640---- 165--------- 150--------- 140,6
0,0650---- 167,5------- 152--------- 142,5
0,0660---- 170--------- 154--------- 144,4
0,0670---- 172,5------- 156--------- 146,3
0,0680---- 175--------- 158--------- 148,1
0,0690---- 177,5------- 160--------- 150,0
0,0700---- 180--------- 162--------- 151,9
0,0710---- 182,5------- 164--------- 153,8
0,0720---- 185--------- 166--------- 155,6
0,0730---- 187,5------- 168--------- 157,5
0,0740---- 190--------- 170--------- 159,4
0,0750---- 192,5------- 172--------- 161,3
0,0760---- 195--------- 174--------- 163,1
0,0770---- 197,5------- 176--------- 165,0
0,0780---- 200--------- 178--------- 166,9
0,0790---- 202,5------- 180--------- 168,8
0,0800---- 205--------- 182--------- 170,6
0,0810---- 207,5------- 184--------- 172,5
0,0820---- 210--------- 186--------- 174,4
0,0830---- 212,5------- 188--------- 176,3
0,0840---- 215--------- 190--------- 178,1
0,0850---- 217,5------- 192--------- 180,0
0,0860---- 220--------- 194--------- 181,9