Vance and Hines short shots
Thread Starter
|
Road Warrior
Joined: Nov 2015
Posts: 1,278
Likes: 465
From: anywhere
Vance and Hines short shots
gerald martin
gerald martin is online now
Road Master
Thread Starter
Join Date: Nov 2015
Location: anywhere
Posts: 1,174
Likes: 5
Received 444 Likes on 290 Posts
Default Vance and hines short shots on a carberated 2002 harley fatboyI have a set of Vance and Hines short shots on my carbureted 2002 harley fat boy. I have a small back fire and popping on deceleration. Is this normal? My intake is not leaking and my exhaust is not leaking. I have the stock carburetor on it.. Any help would be appreciated.
Thanks in advance
I also have the super quiet baffles with a 5/8 inch hole drilled in the end of them. and my carburetor idle screw is 3 turns out from softly seated.
gerald martin is online now
Road Master
Thread Starter
Join Date: Nov 2015
Location: anywhere
Posts: 1,174
Likes: 5
Received 444 Likes on 290 Posts
Default Vance and hines short shots on a carberated 2002 harley fatboyI have a set of Vance and Hines short shots on my carbureted 2002 harley fat boy. I have a small back fire and popping on deceleration. Is this normal? My intake is not leaking and my exhaust is not leaking. I have the stock carburetor on it.. Any help would be appreciated.
Thanks in advance
I also have the super quiet baffles with a 5/8 inch hole drilled in the end of them. and my carburetor idle screw is 3 turns out from softly seated.
HDF Community Team
Joined: Jun 2006
Posts: 12,773
Likes: 2,603
From: san antonio
Assume stock CV 40 carb? Any work done recently? How did you verify intake and exhaust not leaking? If absolutely certain intake and exhaust are not leaking, I would be working with the A/F screw; 1/1 turn can make a difference.
Seasoned HDF Member
Joined: Sep 2008
Posts: 14,113
Likes: 11,160
From: San Diego, CA
OP.... I had V&H longshots on my 2001 and was able to tune it so there was no decel pop or backfires. I have heard the shortshots can be a little more finicky to tune... but I have no experience with them.
On your OEM CV40 carb, there is an EPA mandated plug blocking the A/F mixture screw. If it is still in place on your carb, the bike has never been tuned before. When tuning a carbed HD with the CV40 carb, that plug is the firt thing removed.
There is a process for tuning the CV40 carb that always starts & ends with the mixture screw. The micxture screw setting determines if a bigger pilot jet is needed, and after any jet/needle change, you always go back to dialing in the mixture screw... There are instructions/guides on the CV Performance web site that can help if you are unfamiliar with the CV40 carb. My only warning, there are many that used to recommend drilling a small hole in the CV40 slide... Don't do it, better to properly tune it...
https://cv-performance.com/instructions-guides
FWIW... Every bike is different, but just for comparison: my 2001 88" Twin Cam with CV40 carb, SE high flow air filter, and V&H straight shot exhaust ran extremely well (I have recently changed exhaust, retuned, and it still runs very well). I used the OEM jets (45/190), CV Performance velocity needle, and the mixture screw at about 2 turns.
Good luck with your carb tuning...
Last edited by hattitude; Jan 29, 2024 at 09:16 AM.
Road Master
Joined: May 2006
Posts: 954
Likes: 56
From: Ypsilanti, MI
Different bike and year but same exhaust, below in quotes is the last email I received from V&H when working on eliminating an occasional acceleration pop. I was able to eliminate the decel pop myself using the V&H FP3 and corresponding app. Not apples to apples but thought I would share my experience with the V&H Short Shots.
"Keep in mind that the ShortShots Staggered are a short drag style pipe. They will pop and backfire. That is what they are designed to do. We may never get to zero popping since we are fighting what the exhaust was designed to do."
"Keep in mind that the ShortShots Staggered are a short drag style pipe. They will pop and backfire. That is what they are designed to do. We may never get to zero popping since we are fighting what the exhaust was designed to do."
Thread
Thread Starter
Forum
Replies
Last Post
gerald martin
Exhaust System Topics
0
Jan 28, 2024 07:45 PM
lstcause616
Want To Buy Motorcycles/Parts/Accessories
0
Apr 2, 2010 10:50 AM
