CV experts needed
CV experts needed
1.) When I got my '05 carbed Heritage Twincam 88, it had 4300 miles, SE pipes, and air filter done.
2.) I didn't like the popping back thru the carb, so drilled out the plug to readjust. (had a 45 pilot in it)
3.) Went from 45 to 48 to 50 pilots, the last one finally making it run right at 1-1/3 turns out. Prior jets required over 3 turns.
4.) Due to some lean characteristics at low speeds, put in a new manifold boot, and a Sportster needle.
5.) Due to poor mileage, switched back to stepped needle; adjusted down until lean and back one groove. Bike runs better, but mileage still poor - 35-36 city 38-43 Hwy, but much better in the mountains.
6.) Finally checked main jet to see if I could lean it some. Stock is 185-190? This thing has a 175 in it!
Is it possible that the lean main along with the needle nearly at it's leanest setting possibly somehow causing the poor mileage? Or what? It really does run perfectly from idle to hwy, save for being a little weak at WOT.
2.) I didn't like the popping back thru the carb, so drilled out the plug to readjust. (had a 45 pilot in it)
3.) Went from 45 to 48 to 50 pilots, the last one finally making it run right at 1-1/3 turns out. Prior jets required over 3 turns.
4.) Due to some lean characteristics at low speeds, put in a new manifold boot, and a Sportster needle.
5.) Due to poor mileage, switched back to stepped needle; adjusted down until lean and back one groove. Bike runs better, but mileage still poor - 35-36 city 38-43 Hwy, but much better in the mountains.
6.) Finally checked main jet to see if I could lean it some. Stock is 185-190? This thing has a 175 in it!
Is it possible that the lean main along with the needle nearly at it's leanest setting possibly somehow causing the poor mileage? Or what? It really does run perfectly from idle to hwy, save for being a little weak at WOT.
Outstanding HDF Member
Joined: Oct 2007
Posts: 3,437
Likes: 15
My guess is being there is a 175 main jet you have a dynojet kit in it. If that is the case you have a different emulsifier tube as well. It is tough to get real good mpg with dynojet kits. Stock needles do not have clip positions either which further makes me think it is a dynojet kit.
Bought a 185 to try in it; will put in and run tomorrow to tune things - I'm going to retry the 48 pilot, just to see if I can make it work.
The needle tube that holds the main has two very small holes through it, up by the needle jet, if that tells us anything. I thought the stepped needle was odd, since it's not in my book. I'd better get some allens for the bowl too. Had to replace one of the screws and found out it's an M4.
The needle tube that holds the main has two very small holes through it, up by the needle jet, if that tells us anything. I thought the stepped needle was odd, since it's not in my book. I'd better get some allens for the bowl too. Had to replace one of the screws and found out it's an M4.
Cruiser
Joined: Oct 2011
Posts: 164
Likes: 0
From: Keyser, WV
Sounds like a Dynojet kit, but I don't know why they did a kit and the plug over the mixture screw was still there. I usually end up with a 48 slow jet a 180 main and the needle cliped in the 3 slot with the shims above, drilled slide port and I stay with the stock spring on heavier bikes to avoid a lag from the slide reacting to quick. Sound like you need to kind of start over with known mods.
The Harley 185 won't fit; different threads, indicating that yes, it's a dynajet kit, from what I've read tonight. I did find something interesting though, that may help or at least not hurt - I put the 48 back in, then found this power tube for $16 -http://www.harley-performance.com/cv-performance-parts.html
-called the CVP Velocity Emulsion Tube.
At least it will hold the stock Harley jet threads so I can use the one I bought. Can't find a review on it yet.
Battery dead so couldn't test anything tonight. Stoopid Garmin turns itself on at night if I don't unplug it. Guess i got more than one gremlin after all...
oh yeah...what about contouring the slide? Any good in this situation? I'm pretty good with tools and I've got a lot of 'em.
-called the CVP Velocity Emulsion Tube.
At least it will hold the stock Harley jet threads so I can use the one I bought. Can't find a review on it yet.
Battery dead so couldn't test anything tonight. Stoopid Garmin turns itself on at night if I don't unplug it. Guess i got more than one gremlin after all...
oh yeah...what about contouring the slide? Any good in this situation? I'm pretty good with tools and I've got a lot of 'em.
Outstanding HDF Member
Joined: Oct 2007
Posts: 3,437
Likes: 15
I have yet to find an emulsifier tube other then stock that works worth a crap. Find a stock one put in a 185 or 190 main and 45 or 48 slow with a stock needle shimmed .050 or so 2.5 turns out from lightly seated on the air/fuel screw and start from there. Chances are if you have the dyno jet kit they probably drilled the vacuum port on the slide and it has the lighter spring so who knows where you are at.
Ok, heading out to the bike shop now to feel a stock spring and find a tube for the jet. If drilled, that would be a 1/8" hole right? I never had any slide bounce, so not sure if they drilled it or not - seems like not if they didn't even drill the idle jet plug.
Kinda hate it that my plugs look good and she revs quick from idle with the 50 in there.
Kinda hate it that my plugs look good and she revs quick from idle with the 50 in there.
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Cruiser
Joined: Oct 2011
Posts: 164
Likes: 0
From: Keyser, WV
oh yeah...what about contouring the slide? Any good in this situation? I'm pretty good with tools and I've got a lot of 'em.
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If your not sure what your doing you can really wack things out . I do alot of slide work but I doubt it would help with your issues. Make sure the emulsion tube is clear as well as all ports in the jets. As far as putting the H-D stuff back in.WHY? Dosen't work worth a crap to start with so why go back to it??? I have probably installed and dynotuned 250 or so Dynojet kits without any issues and have always made more power than a jetted stocker. Theres a combination issue going on and your gonna have to work eash thing out. Remember, change 1 thing at a time so you know what worked and what didn't.
[/quote]
If your not sure what your doing you can really wack things out . I do alot of slide work but I doubt it would help with your issues. Make sure the emulsion tube is clear as well as all ports in the jets. As far as putting the H-D stuff back in.WHY? Dosen't work worth a crap to start with so why go back to it??? I have probably installed and dynotuned 250 or so Dynojet kits without any issues and have always made more power than a jetted stocker. Theres a combination issue going on and your gonna have to work eash thing out. Remember, change 1 thing at a time so you know what worked and what didn't.
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New discoveries. Found a mech yesterday very familiar with rejetting CV's. It turns out that the emulsion tube was NOT dynojet, but Harley - not all the jets are the same thread? Anyway, it was clear. He set me up with a different Harley tube that has a lot of the little airway holes in it (much like the one in the link I posted before) and a 190 jet for it - with the small threads. $4 at Ace Hardware got stainless allens for the bowl - heaven!
I put the 48 pilot back in, and the new tube with 190 and went for a 40 degree ride last night - never really warmed the engine up despite crash bar chaps, but I did do a roll on in 3rd from 40 to 70 in about two seconds - she loves that jet, but some serious decel popping told me that she was too cold to be hammering like that, so upshifted and went home - forgot my face mask.
I'll try this combo out this weekend and check mileage too.
I'm still not completely sure about the tubes - why would Harley change the thread size, and why would a supposedly older tube have all the holes in it and the newer one only two? Something doesn't feel right about that, but at least I was right about my main jet; I was suffering performance at WOT, but don't hammer on the bike a lot, so it wasn't a huge issue.
BTW, thanx for getting back! I really appreciate the guidance.
I put the 48 pilot back in, and the new tube with 190 and went for a 40 degree ride last night - never really warmed the engine up despite crash bar chaps, but I did do a roll on in 3rd from 40 to 70 in about two seconds - she loves that jet, but some serious decel popping told me that she was too cold to be hammering like that, so upshifted and went home - forgot my face mask.
I'll try this combo out this weekend and check mileage too.
I'm still not completely sure about the tubes - why would Harley change the thread size, and why would a supposedly older tube have all the holes in it and the newer one only two? Something doesn't feel right about that, but at least I was right about my main jet; I was suffering performance at WOT, but don't hammer on the bike a lot, so it wasn't a huge issue.
BTW, thanx for getting back! I really appreciate the guidance.
Last edited by Quadancer; Dec 1, 2011 at 07:10 AM.