Re-jetting
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Elite HDF Member
Joined: Nov 2007
Posts: 4,646
Likes: 40
From: Midtown Tulsa
Re-jetting
Okay, I'm going to be installing Vance and Hines Short Shots on my '87 FXR as the original pipes are pretty beat up and scratched. It has the original carb and air cleaner set up. I am assuming it is a Keihin butterfly carb by looking at the pictures in the service and parts manual (the only way I know to identify as to now). Any other way of identifying would be great.
I don't have any plans to change out the air cleaner with the pipes, so my question is, am I going to need to re-jet with just the exhaust change?
Right now it seems to have a lean off-idle roll-out stumble/backfire when it is cold outside and the bike isn't quite warmed up. I have yet to pull the plugs and inspect them; will do that this coming weekend and photograph them.
The bike has around 17,000 miles on it so far.
Thanks in advance for any answers...
I don't have any plans to change out the air cleaner with the pipes, so my question is, am I going to need to re-jet with just the exhaust change?
Right now it seems to have a lean off-idle roll-out stumble/backfire when it is cold outside and the bike isn't quite warmed up. I have yet to pull the plugs and inspect them; will do that this coming weekend and photograph them.
The bike has around 17,000 miles on it so far.
Thanks in advance for any answers...
Road Warrior
Joined: Dec 2007
Posts: 1,854
Likes: 20
From: Eagle River WI
Probably you will have to up the pilot jet size I would go to a high flow air filter like a K&N Make sure you support these pipes properly I've seen alot of cracked Vance and Hinds pipes on FXR's over the years
Road Warrior
Joined: Oct 2009
Posts: 1,251
Likes: 1
Okay, I'm going to be installing Vance and Hines Short Shots on my '87 FXR as the original pipes are pretty beat up and scratched. It has the original carb and air cleaner set up. I am assuming it is a Keihin butterfly carb by looking at the pictures in the service and parts manual (the only way I know to identify as to now). Any other way of identifying would be great.
I don't have any plans to change out the air cleaner with the pipes, so my question is, am I going to need to re-jet with just the exhaust change?
Right now it seems to have a lean off-idle roll-out stumble/backfire when it is cold outside and the bike isn't quite warmed up. I have yet to pull the plugs and inspect them; will do that this coming weekend and photograph them.
The bike has around 17,000 miles on it so far.
Thanks in advance for any answers...
I don't have any plans to change out the air cleaner with the pipes, so my question is, am I going to need to re-jet with just the exhaust change?
Right now it seems to have a lean off-idle roll-out stumble/backfire when it is cold outside and the bike isn't quite warmed up. I have yet to pull the plugs and inspect them; will do that this coming weekend and photograph them.
The bike has around 17,000 miles on it so far.
Thanks in advance for any answers...
Tourer
Joined: Mar 2009
Posts: 375
Likes: 4
From: St. Peters, Missouri
Okay, I'm going to be installing Vance and Hines Short Shots on my '87 FXR as the original pipes are pretty beat up and scratched. It has the original carb and air cleaner set up. I am assuming it is a Keihin butterfly carb by looking at the pictures in the service and parts manual (the only way I know to identify as to now). Any other way of identifying would be great.
I don't have any plans to change out the air cleaner with the pipes, so my question is, am I going to need to re-jet with just the exhaust change?
Right now it seems to have a lean off-idle roll-out stumble/backfire when it is cold outside and the bike isn't quite warmed up. I have yet to pull the plugs and inspect them; will do that this coming weekend and photograph them.
The bike has around 17,000 miles on it so far.
Thanks in advance for any answers...
I don't have any plans to change out the air cleaner with the pipes, so my question is, am I going to need to re-jet with just the exhaust change?
Right now it seems to have a lean off-idle roll-out stumble/backfire when it is cold outside and the bike isn't quite warmed up. I have yet to pull the plugs and inspect them; will do that this coming weekend and photograph them.
The bike has around 17,000 miles on it so far.
Thanks in advance for any answers...
Do yourself a favor, i know this isnt probably what you want to hear, but since it is winter time, shop for a later cv 91-98, and a intake, both could be had for 100 bux, then jet the bike, use a 46 pilot, 175-185 main, air screw 1.5 turns out, and that will give you a very good baseline, youll thank me later, guaranteed. chad.
Take a look at this..I've found it to be very helpful, and there is a ton of other great info on this site...if you haven't already seen it.
http://www.nightrider.com/biketech/hd_cv_mods.htm
I'd really suggest an Arlen Ness Big Sucker intake. One can be had fairly cheaply, and they will open up your intake system very well.
Hope this helps...
Last edited by 98 FLHX; Feb 17, 2010 at 08:19 AM.
Thread Starter
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Elite HDF Member
Joined: Nov 2007
Posts: 4,646
Likes: 40
From: Midtown Tulsa
Okay, so I have bought a CV off a '92 FXR...came with intake, choke cable and complete air cleaner. Seemed like a good deal off Ebay.
Have part numbers for jets and getting them on the way...can't wait to get the carb put on and tuned up.
I am getting the #45 jet and also buying a #175 and #180 (going to try both, to see which one works better). Good reading at nightrider.com! Thanks for the help so far.
Have part numbers for jets and getting them on the way...can't wait to get the carb put on and tuned up.
I am getting the #45 jet and also buying a #175 and #180 (going to try both, to see which one works better). Good reading at nightrider.com! Thanks for the help so far.
Thread Starter
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Elite HDF Member
Joined: Nov 2007
Posts: 4,646
Likes: 40
From: Midtown Tulsa
BTW, I'm kind of digging the oval Sportster looking air cleaner from V-Twin.
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Club Member
Joined: Jun 2007
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From: North Atlanta Area, GA
I run a Hypercharger Pro (large K&N element) and V&H Dresser Duals with straight fishtails. I run a 45 idle jet and 175 main jet, and the idle screw about 2 1/2 turns out. Engine runs perfectly, and the plugs are nice and white. I would definitely recommend an "EZ Just" idle screw - it's a thumbscrew that replaces the stock idle mixture screw, and sticks out of the bottom of the carb... it make it very easy to adjust the idle mixture with the engine running without having to get a little screwdriver up in there.
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Thread Starter
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Elite HDF Member
Joined: Nov 2007
Posts: 4,646
Likes: 40
From: Midtown Tulsa
I run a Hypercharger Pro (large K&N element) and V&H Dresser Duals with straight fishtails. I run a 45 idle jet and 175 main jet, and the idle screw about 2 1/2 turns out. Engine runs perfectly, and the plugs are nice and white. I would definitely recommend an "EZ Just" idle screw - it's a thumbscrew that replaces the stock idle mixture screw, and sticks out of the bottom of the carb... it make it very easy to adjust the idle mixture with the engine running without having to get a little screwdriver up in there.
Thread Starter
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Elite HDF Member
Joined: Nov 2007
Posts: 4,646
Likes: 40
From: Midtown Tulsa
Okay, carb is on....man what a difference! Used the #45 and #175. Two turns out on the main idle.
I runs like a completely different bike. Starts and idles perfect.
Thanks for the advice from all!
I runs like a completely different bike. Starts and idles perfect.
Thanks for the advice from all!