My first post.
I have a 86 evo with 4 speed kickstart. I got the bike in 87 andits been a great bike for 20 years.
Last year at the Davenport swapmeet I raninto a stock set of pipes with stock slipons.. I paid 10 dollars for the whole works.
This year at the Woodstock swapmeet I found a Supertrapp 2 into one with a Supertrap muffler disk setup.I got a fair deal on this butthe collector wont fit because its for a 5 speed. Well thats too bad.

The stock set bolted up nice.So I drilled a 3/4 hole thrubaffel for more flow. Thisis a bit less loud thanmy other pipes. Also I was hopeing for more back pressure. It runs better.It has a EV13 cam and Jetted CV.

Ok my question,,,, ready? What does the crossover pipe for on the stock pipes do?
Will the motor run better leaving it on? Or off?

Kilgore T.

Here is a link to photo of old pipes http://i150.photobucket.com/albums/s91/Woodrow_07/86Harley003.jpg

I understand it evens out the back pressuree and helps to scavange the exhaust. With out it it will change the torque curve. I can't verify it because I still use the crossover. Iwould have to try both on the same bike with the same set-up to know for sure. It was explained to me that it helps mostly in the low end. I know its not much help but I tried. BTW I live by Davenport maybe see you there.

Oh Yeah...... Welcome to the forum

ORIGINAL: Fat Henry

I understand it evens out the back pressuree and helps to scavange the exhaust. With out it it will change the torque curve. I can't verify it because I still use the crossover. Iwould have to try both on the same bike with the same set-up to know for sure. It was explained to me that it helps mostly in the low end. I know its not much help but I tried. BTW I live by Davenport maybe see you there.

Oh Yeah...... Welcome to the forum


Ditto, on the explanation that is what I understand also. To be honestI do not like the looks of the crossover pipes but I am to cheap to replace good pipes.

I don't like the look of the crossover either (makes is look like a sportster). But my bike runs so strong right now, I'm affraid to mess with it.

It could be my imagination but it does seem to Idle a bit better ,Its a lot quiter,and seemsstrong off idle.
Ive got a lot of miles on this bike in the last 20 years, Im on the 3rd speedo.

What I plan is to find a junked collector cut it up and make a 2into 1 using the stock pipes andthe 2 inch slipon Supertrapp. Then paint the whole works black. Photo of old setup is in first post(link). I dont think the paughtos? had enuf back pressure for me.

By the way Im a cheap bastard also, who else would never sell any of there bilkes?

Kilgore Trout

Keep a eye out for the Cargo barge this year at Davenport.