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Keep & Kill
Last Post: Crusty
Posted On: 10 Minutes Ago
Replies: 19,620
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1st December 2020
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XL FORUM TEAM MEMBER
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Join Date: May 2020
Location: Lower AL
Posts: 156 Sportster/Buell Model: XL 883 Sportster/Buell Year: 2007 Other Motorcycle Model: Suzook Burgman 400/ 2008
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Potato-potato
2007 883
As you know, this bike has an elaborate and heavy cross-over built into the exhaust system. Which mutes the Potato-Potato sound somewhat. IMO.
Has anyone blanked off the crossover system from the mufflers. Might give a sharper POP-POP----POP-POP sequence?
I think the bike would run OK, it has separate exhaust sniffers for front and back cylinders.
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2nd December 2020
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Senior Master Custom Bike Builder
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Join Date: Apr 2012
Posts: 3,645 Sportster/Buell Model: XLH 883/1250 Sportster/Buell Year: 1991
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It's shown that you likely lose some mid range performance by deleting the crossover. I have the old "H" pipe crossover under the carb, so I've grown to love it, ugly as it is, especially because it helps exhaust flow.
You also should keep idle up on a Sportster, to keep the oiling system flowing well. Lowering idle to get the "potato" sound is not good on a Sportster. Get a Shovelhead BT for that low idle sound. With EFI, you might have to re-map to lower the idle speed if even possible.
John
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2nd December 2020
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Dazed & Confused
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Join Date: Feb 2019
Location: Never Never Land
Posts: 1,885 Sportster/Buell Model: XL1200C Sportster/Buell Year: 2017 Other Motorcycle Model: BMW R9T Other Motorcycle Year: 2015
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When you eliminate the crossover you have drag pipes and all the issues that come with them. I'd keep the crossover. You can play with timing and mixture and screw up the idle if you really want the sound...
__________________
2017 XL1200C in SE Wisconsin, USA
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2nd December 2020
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Master Bike Builder
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Join Date: Mar 2015
Location: Europe Slovenia
Posts: 2,083 Sportster/Buell Model: sportster 1200 Sportster/Buell Year: 1986
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Quote:
Originally Posted by Tomcatt
When you eliminate the crossover you have drag pipes and all the issues that come with them. I'd keep the crossover. You can play with timing and mixture and screw up the idle if you really want the sound...
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Well that's not the case, if you have muflers in. Drag pipes are just empty pipes... |
2nd December 2020
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XL FORUM TEAM MEMBER
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Join Date: May 2020
Location: Lower AL
Posts: 156 Sportster/Buell Model: XL 883 Sportster/Buell Year: 2007 Other Motorcycle Model: Suzook Burgman 400/ 2008
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Yeah, I'll leave it alone...."let sleeping dogs lie"
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2nd December 2020
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Senior Chief Master Mechanic 2nd Class
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Join Date: Apr 2019
Location: 17130 Spain
Posts: 1,551 Sportster/Buell Model: XL 883 ₪ 1275 Sportster/Buell Year: 2006 Other Motorcycle Model: Big Dog K9 Other Motorcycle Year: 2006
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EFI, right? don´t even try... or you will open a can of worms.
Make it sound "Good & Deep" with a good exhaust and be happy.
Ride On!
Don´t forget you can always upgrade her to 1275 with a Hammer Kit, 
__________________
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