HarleyTechTalk

Technical Forums => Shovel Head => Topic started by: egstandard on June 04, 2019, 01:00:40 PM

Title: CV on shovel jetting
Post by: egstandard on June 04, 2019, 01:00:40 PM
Wouldn't a good starting point with a CV carb on a stock 80 inch shovel be the same as a stock 80 inch evo?
Title: Re: CV on shovel jetting
Post by: turboprop on June 04, 2019, 01:25:17 PM
Wouldn't a good starting point with a CV carb on a stock 80 inch shovel be the same as a stock 80 inch evo?

Not really. I did this a few years ago and as I recall both jets ended up being larger than they would have been on a comparable EVO. Have also see a few posts here from members that reported similar results.  I suspect that what you are really asking for is a jet recommendation. Unfortunately, I dont recall what I ended up using, but I bet if you searched on CV in the shovel section that the information is already there.
Title: Re: CV on shovel jetting
Post by: egstandard on June 04, 2019, 01:50:02 PM
Yeah, I did this about 8 years ago on a previous shovel I owned. Don't remember where I started. A 48 pilot and 185 main comes to mind, but I'll dig around in the search section then. Thanks.
Title: Re: CV on shovel jetting
Post by: Burnout on June 04, 2019, 01:58:01 PM
On an EVO I would start at 46 & 175 Don't know why a Shovel would want more fuel.
Title: Re: CV on shovel jetting
Post by: turboprop on June 04, 2019, 03:24:15 PM
Yeah, I did this about 8 years ago on a previous shovel I owned. Don't remember where I started. A 48 pilot and 185 main comes to mind, but I'll dig around in the search section then. Thanks.

There is a lengthy thread on this page titled Shovelhead CV Jetting. Three pages of responses. 
Title: Re: CV on shovel jetting
Post by: Julio on June 04, 2019, 03:25:31 PM
48/175 on both my evo and 80"shovel.
Title: Re: CV on shovel jetting
Post by: egstandard on June 04, 2019, 03:38:15 PM
I found that turboprop. Thanks
Title: Re: CV on shovel jetting
Post by: thumper 823 on June 11, 2019, 01:31:29 AM
I always tell everyone to get an AFR wideband and be done.
There is no use guessing.
Not have one is sort of like a bone doctor refusing to get an XRay machine.
Title: Re: CV on shovel jetting
Post by: 76shuvlinoff on June 11, 2019, 02:53:07 AM
Yeah, I did this about 8 years ago on a previous shovel I owned. Don't remember where I started. A 48 pilot and 185 main comes to mind, but I'll dig around in the search section then. Thanks.

There is a lengthy thread on this page titled Shovelhead CV Jetting. Three pages of responses.

 Not sure why but my search capabilities seem to be lacking today. If someone wants to bump it we can make it a sticky.
Title: Re: CV on shovel jetting
Post by: turboprop on June 11, 2019, 03:19:20 AM
Yeah, I did this about 8 years ago on a previous shovel I owned. Don't remember where I started. A 48 pilot and 185 main comes to mind, but I'll dig around in the search section then. Thanks.

There is a lengthy thread on this page titled Shovelhead CV Jetting. Three pages of responses.

 Not sure why but my search capabilities seem to be lacking today. If someone wants to bump it we can make it a sticky.

https://harleytechtalk.com/htt/index.php?topic=88881.msg1015979#msg1015979 (https://harleytechtalk.com/htt/index.php?topic=88881.msg1015979#msg1015979)
Title: Re: CV on shovel jetting
Post by: guppymech on June 11, 2019, 07:17:43 AM
I read that whole other thread and for what it's worth, in post #56 JW mentions that at WOT when he rolled off the throttle closed the speed picked up....that signals that the main jet is slightly too small.   Rolling off the throttle reduces the airflow to match the small main jet.  With a correct sized main jet the rpm will just drop with the throttle roll off.  If the main is too big the engine will stumble and then reduce rpm.  With the slide controlled by airflow on the CV the rpm that will put the carb on the main jet is above 4k rpm to get a clear indication of main jet response to rolling off the throttle.  It's easiest to note the response when running that rpm steady on the highway then you can note if the speed picks up easily.  On my 883R I got a very clear signal it wanted more fuel rolling the throttle off at 90mph which surprised me as prior tests done at lower rpm/speed had indicated the smaller main jet was doing good.
Title: Re: CV on shovel jetting
Post by: JW113 on June 11, 2019, 08:40:47 AM
I just did a follow up to that post. The problem was the cam.

Currently the CV has 45-180-N72S for jets/needle, and is working great.

-JW
Title: Re: CV on shovel jetting
Post by: HD Street Performance on June 11, 2019, 10:24:40 AM
50 & 175
Title: Re: CV on shovel jetting
Post by: dablaze on June 11, 2019, 06:39:07 PM
Canít remember what, but as I recall the sizes of jets I had to use in my shovel surprised me.

Craig
Title: Re: CV on shovel jetting
Post by: egstandard on June 13, 2019, 11:43:54 AM
 I was surprised to see that this 1990 CV carb did not have a directional arrow for removing the float pin. It comes out in either direction.  I've never seen one like that.
Title: Re: CV on shovel jetting
Post by: JW113 on June 13, 2019, 04:33:48 PM
Look at the float bowl. Does it have two little tabs that locate on each side of the float pivot bosses after the bowl is put on?

-JW
Title: Re: CV on shovel jetting
Post by: egstandard on June 13, 2019, 07:47:02 PM
Nope
Title: Re: CV on shovel jetting
Post by: egstandard on June 16, 2019, 01:48:55 PM
I have it up and running. Much better response and driveability than that S&S B. Currently running a 175 main and 48 pilot. Screw is 3 turns out. CV Performance velocity needle. Smells rock at a stop light. Doesn't run like it's rich. Very responsive from off idle. I might drop down to a 46 for shits and giggles.
Title: Re: CV on shovel jetting
Post by: guppymech on June 16, 2019, 02:48:46 PM
3 turns out on a 48 pilot jet would indicate it's OK but a 46 would most likely be too small.