CV carb jets again
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Joined: Jun 2007
Posts: 3,193
Likes: 7
From: North Atlanta Area, GA
Someone is gonna have to show me one or document that they even make a 46 low jet. I never saw one except a 48 that looks like a "6" on the stamp... well I just did some searching and sure enough, there's people out there selling what they call a 46 low jet. Just goes to prove "they" will make anything some one will buy... but Keihin doesn't not make one http://www.keihin-us.com/list.htm
Jim I'd stay with the 180 for now but definitley go up on the low jet. 180 will give you enough for almost any bolt-in cam, assuming you don't want to kill your fuel mileage. Going to a 45 will let you put more to it without being so far out on the screw that it's inconsistant with the fuel. That's what happens when you get too far out, you're either OK or too lean with no room to tweak in between.You could even go with a 48, and that'd put you good for any cam or pipe combo you might run later but could prove to be a little much. If you do a 45, start about 2.25 out on the screw. Tuning one so you don't need to use the enricher for a short period when it's cold, only wastes fuel when it's up to temp...
You never did say what cam you're running? (if you know) and where is the idle screw at now with the 42?
Jim I'd stay with the 180 for now but definitley go up on the low jet. 180 will give you enough for almost any bolt-in cam, assuming you don't want to kill your fuel mileage. Going to a 45 will let you put more to it without being so far out on the screw that it's inconsistant with the fuel. That's what happens when you get too far out, you're either OK or too lean with no room to tweak in between.You could even go with a 48, and that'd put you good for any cam or pipe combo you might run later but could prove to be a little much. If you do a 45, start about 2.25 out on the screw. Tuning one so you don't need to use the enricher for a short period when it's cold, only wastes fuel when it's up to temp...
You never did say what cam you're running? (if you know) and where is the idle screw at now with the 42?
Last edited by NorthGeorgiaHawg; May 19, 2010 at 04:38 PM.
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Stellar HDF Member
Joined: May 2009
Posts: 2,856
Likes: 127
From: Middle of Kansas
One thing about it. It is real easy to change jets, just like on my Sportster. Since I have drag pipes, and no crossover, makes it real easy to just drop the bowl off without having to remove the carb. Lots of room to work, once you get the air cleaner off. Its raining cats and dogs here now, so will have to wait a couple of days to try her out, and finalize the mixture. My wife says, "Your not going to let a little rain stop you are you?" I said, "Yep".
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Joined: Dec 2005
Posts: 5,422
Likes: 2,621
From: NC USA
You're a lucky guy - you should take here riding
I have a 90 flhtc and I got a 44mm CV carb cause I do a lot of touring, about 6,000 to 10,000 a season and wanted a little more air to it. I have Thunder Header 2-1 exhaust and a hypercharger. The engine is stock at this point, gonna get a cam and upgrades when I need them, it runs too good to change engine parts now. The carb came with a 48 for the slow jet and a 220 for the main. I am leaving early Sat for Naples Fl. to see one of my partners haven't seen for years. I live in far western South Dakota so about 2100 or so one way. My sweetie rides on back an I wanted a touch more leg for long rides. My question is... too much having a 220 main? Should I cut back to 180 or 185, I want to get decent mileage, if possible. I got about 35 mpg loaded with the stock carb. Any thoughts? I should say that I hope it's ok to jump on a thread, hope I didn't break a rule.
Last edited by sunka; May 20, 2010 at 09:00 PM.
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Stellar HDF Member
Joined: May 2009
Posts: 2,856
Likes: 127
From: Middle of Kansas
35 mpg doesn't sound to bad fully loaded. I would take a look at the plugs and see if they are carboned up, or running a nice light tan like they should. If they look OK, I would say you are probably OK. More air takes more gas. In your case I would think 185 would be to small. Maybe someone who knows that carb better than I do will chime in here.
Evo Carbs
35 mpg doesn't sound to bad fully loaded. I would take a look at the plugs and see if they are carboned up, or running a nice light tan like they should. If they look OK, I would say you are probably OK. More air takes more gas. In your case I would think 185 would be to small. Maybe someone who knows that carb better than I do will chime in here.
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Stellar HDF Member
Joined: May 2009
Posts: 2,856
Likes: 127
From: Middle of Kansas
Got her out for a ride today after all the rain finally quit. She does run better. Better low end accelleration, and just seems to run a bit easier. I did have just a bit of decel pop before I changed the pilot jet, not much for drag pipes, but after the change, there is none at all. Mixture screw ended up at about 2 turns open, and seems pretty broad. I am going to leave it there for a while, and check the plugs later. Glad you guys talked me in to checking the jets. And thanks for all the help.
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