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Re:Not sure this is the right placefor this question
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TOPIC: Re:Not sure this is the right placefor this question
#1025216
Shores (User)
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Re:Not sure this is the right placefor this question 1 Week, 2 Days ago  
Marc76 wrote:
Im sorry what? All the pipes Ive seen are different lengths. I'm not as loud as other bikes in my neighborhood. It is jetted.

Length may be different, but a good pipe will have the proper amount of staging inside each header and muffler to make them equal. There’s a lot inside a good set that you don’t see. Can’t do better performance wise than Basanni or Freedom Performance. Well engineered.
 
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Last Edit: 2017/11/13 20:42 By Shores.
 

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Re:Not sure this is the right placefor this question 1 Week, 2 Days ago  
+1 to what shores and jd have said. Why not throw a full set of pipes on that bike and prove to yourself it's not because of the extremely short length of pipe you have going on? Back pressure can be such a big factor it would be silly not to eliminate that possibility first.
 
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Re:Not sure this is the right placefor this question 1 Week, 2 Days ago  
You can get a $50 to $60 induction tack, to figure out where your idle is set. You can google Roadstar idle and JD, or search the forum here in the blue banner above and see if you can find the vid, and or a post with the vid, for a comparison. It's difficult comparing the short pipes, to the longer ones just by sound. There is a noticeable difference between any type of dual, and a 2 into 1, as far as sound goes also. The 2 into 1, will always sound smoother. An induction tach, like the EZtach is the best way to be sure.

Do you know what jetting is in the carb now? Main? Pilot? Clip position on the needle? What's under the clip? Always nice to know those things, especially because people can get so far off the beaten path when rejetting a carb.

JD knows more about this then me when it comes to issues with short pipes, but if you have a slight leak at the manifold to head flanges, I would think it could cause some problems at idle, especially if the idle is set to low. The lope in the motor, would exacerbate the the weird idle, by messing with the fuel air ratio at idle when the vacuum behind the throttle plate is high and makes any leaks that may be there, a problem. Just a thought.

Make sure the exhaust gaskets are sealing properly. The Yamaha OEM's, are the best. The torque needs to be revisited several times over a week or so, on a cold motor, after the hot and cold cycle settles the gaskets/pipes.

Short pipes come with inherent problems, but if the idle and jetting are correct, there are no vacuum leaks or exhaust gasket leaks, and the coil wires aren't shorting against something, I wouldn't think the idle would step in and out like that.

I can get a change in idle on mine similar, when the temps are down and on a cold start. It is just at the start, after pushing the enricher in about halfway. The bike will have a slightly sloppy sound, then it sounds like both cylinders start firing properly and it smooths right out. Beyond that, I never get anything close to the weird thing you have going.
 
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Last Edit: 2017/11/14 06:54 By SKWEARpeg.
 
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Re:Not sure this is the right placefor this question 1 Week, 2 Days ago  
Those look like the stock exhaust headers. I'm surprised the bike will run well at all with just those on there. Second of all the Road Star is supposed to have a smooth idle thanks to the 45 pound crankshaft. The idle you say you like isn't normal at all. You'd be better off with the stock mufflers on it.
 
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Last Edit: 2017/11/14 08:56 By texasscott1.
 


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