True Duals Question

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Mar 8, 2012 | 06:15 AM

#11

TurkeyRun

Thread Starter

Road Warrior

Joined: Jul 2007

Posts: 1,367

Likes: 54

From: Somewhere in NorCal

Good point.

I was thinking about the length difference, but yea - the rear header is like "Z" shaped. True.

Mar 8, 2012 | 07:16 AM

#12

Nicky Pass

Road Warrior

Joined: Aug 2010

Posts: 1,807

Likes: 7

I'd say it the exhaust path. On my V&H Dresser Duals, the rear pipe goes straight out the back, while the front pipe has 3 more bends in it and it goes underneath the bike. I'm sure its fine.

Mar 8, 2012 | 07:27 AM

#13

myy2khog

Advanced

Joined: May 2007

Posts: 70

Likes: 2

From: Slidell, La.

On the chirp, take your foot and push down on the rear of each pipe while it's running but still cool. The rubber mounts for the mufflers will make some strange noises when running.

Mar 8, 2012 | 07:53 AM

#14

04 rkcrr

Tourer

Joined: Sep 2007

Posts: 383

Likes: 1

I had duals on my 04 RK, Just switched to Drago's 2-1. My bike did the same thing with duals on, Left head pipe is shorter and has more bends. Back head has to work alittle harder to get the gasses out. My bike also chirps while riding on concrete, See if they chirp on asphalt, If so, check your rubber blocks where your slipons are mounted. They dry out and need replaced, very cheap item. Like 4 bucks.

Mar 8, 2012 | 08:07 AM

#15

EastSideBikerTrash

Road Captain

Joined: Oct 2007

Posts: 597

Likes: 1

From: Texas

Quote:

Originally Posted by TurkeyRun

First the details:
- 2003 FLHRCI w/40K mi
- Stock top-end
- installed within the last 5000mi:
-- Cobra True Duals w/ some kind of slipons I got cheap from ACM
-- SE Adj Pushrods
-- SE211 Cams
-- Hydraulic cam chain tensioner/SE Oil pump kit
-- inner cam bearings
-- FuelMoto branded PC III

Now the question.....

Bike runs great, pulls like a tractor and sounds solid. When idling, I put one hand behind each pipe.

The right pipe (front jug) goes:
POP-POP-POP-POP

The left pipe (rear jug) goes
Puff........ Puff....... Puff.......Puff.....

I haven't figured out how to check it while I toodle down the road at 50 MPH yet

Is this a true dual thing due to the longer header off the front? Should I be looking into adjustment on the pushrods on the rear? Could I have a compression issue on the rear jug? Or, am I freaking out about nothing?

I do have an exhaust-leak kinda sound (chirpy), but that was there before I did any of this work and I was really, really careful and thorough when I did the mods.

Thanks folks!

One of the mufflers probably has the wrong baffle. Most mufflers are setup for a header with a crossover.

Mar 8, 2012 | 08:13 AM

#16

grbrown

Club Member

Joined: Jun 2007

Posts: 45,429

Likes: 2,896

From: Bedford UK

Quote:

Originally Posted by EastSideBikerTrash

One of the mufflers probably has the wrong baffle. Most mufflers are setup for a header with a crossover.

Good point! With the stock pipes the right flowed more exhaust than the left and the mufflers look the same, but are different inside.

If the mufflers you have on are stock ones, a pair of proper after-market mufflers will fix that.