DynoJet details needed
Harley Twin CamDiscuss DynoJet details needed in the Motorcycles forums; My OE CV carb on my 2002 FLHTC has been modified with a Dynojet kit. And I don't know exactly which vendor's kit was used. But I still want to ...
My OE CV carb on my 2002 FLHTC has been modified with a Dynojet kit. And I don't know exactly which vendor's kit was used. But I still want to tune on it some more. I would like to try some needle tricks to get better mid throttle performance. But since I don't know the specs of the needle that has been installed before I bought the bike, I don't know what needles to buy or where to get them.
Can anybody out there help me fill in the blanks here?
__________________
Coot & Nelly Bell
"If you don't stand for something,
you don't stand for nothing." unknown
If it's a DJ needle (with height adjustments) it should be all you'll need.
I have the same year Glide, also carbed with a DJ kit, fuel delivery is as close to perfect as it gets. It takes a bit of playing around to get it right.
Any engine work? Cams? Pipes?
__________________ "Is there finally and really anything to life other than food, $hit and sex?" Bubba HoTep
No cams, or engine work. But I am running some CVO 110 slip ons. They don't flow as free as my SE slip ons. But they are OK. And they are saving my sanity & hearing.
The needle does NOT have height adj grooves. I wish it did. So, I need to know what vendors have needles only. I may go get a Sportster OE needle to try. I think it is shorter.
I am looking for some extra Roll-on power when I'm 2-up in mid throttle .
__________________
Coot & Nelly Bell
"If you don't stand for something,
you don't stand for nothing." unknown
I don't remember the needles alone showing up in either catalogs. They were only sold as kits w/ jets. You might try calling their toll free numbers and asking directly. Both companies have excellent phone support and service. Prices are very competitive, also.
I need to get info from some carb builders out there first. Otherwise I might be buying parts that I already have or that I don't need. That would be time & money wasted. At $17 per needle, it can add up to a lot of lost cash.
__________________
Coot & Nelly Bell
"If you don't stand for something,
you don't stand for nothing." unknown
The slow jet is a #45, the main Jet is a #190 or a 195, MOCO changed jets mid stream. Most DJ kits changed needles, piston springs and drilled a hole in the vacuum piston. If you are trying to go back to stock those are good starting pointsyou could install the sportster needle (27094-88) or just put two #4 brass washers under the stock needle, then turn the fuel mix screw out from lightly seated about 2 1/2 turns, that should put you back inthe ball park and get rid of the carb farts.
Playing with your rig's carb can be a rewarding experience if... You have a benchmark to start out with.
(and...a good understanding how much influence each circuit has on the overall carb performance...and the relationship of any one circuit with the other two)
Now, how a CV delivers isn't rocket science, it's pretty straight forward.
But you must have a benchmark, a starting point...point of reference.
That's where a simple dyno run (not a dyno tune) comes in handy.
1 run. That's all it takes.
Peak HP and TQ are only numbers, but the graph will reveal a ton of info for you.
And even more important.....the AFR (air/fuel ratio) graph... THAT'S your reference point.
(assuming the dyno operator knows his equipment.)
If you have a lean spot on your midrange, (and the AFR will show if you do) there's not a heck of a lot more ooomph you can coax outta your rig, unless you open up the back end some more. And come to think of it, whatcha got as an air cleaner?
There's lots of scenarios...you may be running just a tad rich..(190 main on a stock CV delivers PLENTY of juice), it's how that needle and jet manage the fuel....is the stock 45 slow in there?? Slow jet has a huge influence on throttle...etc, etc.
Get your ride dynoed!
I hope my babbling makes sense coot.
__________________ "Is there finally and really anything to life other than food, $hit and sex?" Bubba HoTep
Yeah. It all makes sense. The slow is 48. And the intake is SE/K&N. The SE slip-ons were just getting too damned noisey for me & the wife. So, I've found some CVO 110 slip-ons that breathe pretty good. They still push back at me around 2500 to 3200. So I want to try to tune this out with some needle magic if possible. It may not be possible. And I might have to just get used to a little squish in that range. The local dealer has a dyno. But I'm a tightwad and I think I can make myself happy somehow. If not, I'll put the SE mufflers back on and wear earplugs. The 190 is just fine for this old 88. So, I'm gonna try a couple of washers and maybe a Sporty needle before I cry myself to sleep.
It's too late to go back to stock. I have tasted the good stuff.
__________________
Coot & Nelly Bell
"If you don't stand for something,
you don't stand for nothing." unknown
Posting 2 graphs from dyno done a long time ago.
State of the Glide at the time was pretty much the same as yours (xcept for an actual DJ carb kit, and Kerker PAT exhaust, a bit more free flowing than the SEs).
Also some CV (Sporty) needle comparisons (their taper, length)
__________________ "Is there finally and really anything to life other than food, $hit and sex?" Bubba HoTep
This is great info. Thanks!
I am making a copy for my file and I'm getting a couple of Sporty needles tomorrow. And it just so happens that I have three brass washers measuring .040 to play with.
Thanks again PeterV.
How is the weather?
I had Nelly Bell out for a few hours today. She likes the Fall weather in Georgia.
__________________
Coot & Nelly Bell
"If you don't stand for something,
you don't stand for nothing." unknown
DynoJet details needed 
Re: DynoJet details needed 
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