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Old 06-26-2011, 09:32 AM   #1 (permalink)
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Jetting after Air Cleaner and Exhaust upgrade

Hi, I just installed a K&N High flow air cleaner and Exhaust to my 1996 Dyna Wide Glide (Evo Motor) It runs great but I'm not sure if I might be running a bit more lean. How does one know if jetting needs to be changed?

Thanks for any help you can give.
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Old 06-26-2011, 09:38 AM   #2 (permalink)
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http://www.nightrider.com/biketech/hd_cv_mods.htm
This is just a suggestion but while your at it you may want to read through this some real easy mods to carb that will make it run much better they also have a section just for the fine tuning on this site they explain it pretty well hope this helps
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Old 06-26-2011, 09:39 AM   #3 (permalink)
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http://www.nightrider.com/biketech/hdbuildstage1_tc.htm
I can't remember all the EVO stuff but this site will point you where you want to go, good stuff in here.
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Old 06-26-2011, 12:54 PM   #4 (permalink)
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If the bike runs well leave it alone. If it runs bad you need a retune, it's as simple as that.
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Old 06-26-2011, 01:15 PM   #5 (permalink)
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Your letting more air in and more air out, most likely running lean, if nothing else not optimally.
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Old 06-26-2011, 11:33 PM   #6 (permalink)
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Quote:
Originally Posted by berserker View Post
Your letting more air in and more air out, most likely running lean, if nothing else not optimally.
That's what I was thinking. Even if it's running good and there is a noticeable improvement, I had a performance cam put in last year and only now upgraded Intake and outgo. I'm pretty sure I'll need to get some more gas in the mix. Thanks for the links, I'll be reading up on them.

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Old 06-27-2011, 07:00 AM   #7 (permalink)
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I do like the Nightrider site. Plus there has got to be someone here with a similar set up. I am guessing, up one size on the slow and main jet, and see. Shim or bigger needle after that.

Also have you drilled out the mixture screw on the carb?
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The only thing that counts in the end is power! Naked merciless force! -Ursus
The Devil made me do it the first time, the second time I did it on my own-Waylon
Helmets are like rubbers you know you should wear one, but its so much better when you don't.-Me
Sometimes I think its a sin, when I feel like I am winning when I am losing again.-GL
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Old 06-27-2011, 08:29 AM   #8 (permalink)
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High from Denver.....Do a simple plug reading ride/test.....you will need a pair of gloves...and a spark plug socket....and a open highway....I would put in a pair of fresh plugs to start too !

go run the bike at 40 mph for a steady 4 miles or so.....grab the clutch and hit the kill switch and get off the road in a safe area.... dont idle to a stop....pull both plugs.....if there snow white....your lean....if there black....your FAT or to rich ....do the test again @ 70 mph

again...white lean....black rich.....if the plugs look a little tan to light brown your jets are pretty close to being correct in size ! If you hace the stock CV carb...there set lean from the factory.....you have a slow jet...that works at idle to about 45 the the main jet kicks in at higer rpm's....and speeds.....remember your motor needs fuel to to make power.....and lean is not good for your motors life!

If your running a cv carb dont waste your money on a new carb,,,,the cv can be worked over and can make 75-80 +hp ...go to CV Performance .com for all the parts you will need to hot rod your carb the right way good luck

Last edited by 59panhead; 06-27-2011 at 08:33 AM.
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Old 06-27-2011, 10:31 AM   #9 (permalink)
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Thanks for the great info 59 Panhead, I'll try the plug read test. I am running a CV carb and will look into some of those mods. I'm sure I can get a bit more out of the setup I have.
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Old 06-27-2011, 12:39 PM   #10 (permalink)
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great step by step. also check www.johnscvperformance
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Old 06-27-2011, 06:44 PM   #11 (permalink)
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If you want a proven kit to properly tune you EVO motor check out the Dynojet web site. They make stage 1 kit for your bike. I did one on my Buell S3T with great results and a dyno run to check the results. The kit comes with plenty of jets to get the carb right and detailed instructions and the correct size drill bit as well. The installation will take an afternoon and as long as you read the instructions and take your time it is what you are looking for.
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Old 07-01-2011, 10:24 PM   #12 (permalink)
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I ordered my rejet kit from CV Performance after looking at all the kits out there. Some were cheaper some were twice as expensive. CVPerformance seemed to have the best kit for the money & good reading on their site....like the nightrider site as well. Just picked up a stone stock 05' FXDC and my 'stage 1' parts all came in this week. CV kit, Arlen Ness Big sucker and Rush slip-ons...can't wait to dig into it! Did it years ago on my FXR, easy to do.
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Old 07-02-2011, 10:39 AM   #13 (permalink)
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I am not sure if I believe in kits. Jets, needles, and shims.
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Lets not turn on each other, unless we have to.
The only thing that counts in the end is power! Naked merciless force! -Ursus
The Devil made me do it the first time, the second time I did it on my own-Waylon
Helmets are like rubbers you know you should wear one, but its so much better when you don't.-Me
Sometimes I think its a sin, when I feel like I am winning when I am losing again.-GL
2001 FLHR, 98"
2007 FLHTCU
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Old 07-03-2011, 07:16 AM   #14 (permalink)
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How you making out? Did you check the plug colors yet? Any spitting thru the carb (sign of lean condition)?
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Old 07-03-2011, 12:53 PM   #15 (permalink)
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the benefit of kits are they come with everything you need. I really hate it when I have to stop and go find parts in the middle of a project. Granted there are always extra things you don't use and have paid for but the convenience and a good set of instructions make it all worth while.
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