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Author Topic: Exhaust port not centered!!!  (Read 4758 times)

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Offline MOTOSCOTT

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Exhaust port not centered!!!
« on: February 13, 2012, 03:19:17 PM »
2008 kx250f/92-500
Got in contact with Jfab and rails on the way!
 Cut my frame rails and prepped.
 Drilled my pivot with 43/64 and the fit is perfect.
 Fine tuned the outer swingarm spacers :? to get a nug fit for the rear engine/swing arm/frame. Installed my motor to get a feel for the final cut for the correct height for the exhaust pipe and !!!!!!!!!!

My exhaust port is about an 1/8 of an inch off center to the left of the front frame down tube. Is this normal? I dont think I have enough to trim in the swing arm spacers to compensate. Chain alignment looks O.K.

Any suggestions.
NO PICS YET COMMING SOON (CAMERA DOWN)

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Motorrad

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Re: Exhaust port not centered!!!
« Reply #1 on: February 13, 2012, 03:54:21 PM »
Hmm thinking what it could be..     

Waiting on pics
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Offline sandblaster

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Re: Exhaust port not centered!!!
« Reply #2 on: February 13, 2012, 04:18:58 PM »
I took a look at my unfinished project and my outlet is split evenly.
So I looked at the possibilities.
Bent frame
Bent pivot pin
Misaligned holes in the engine cases.
Oblong holes in the frame.
What else could it be?
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The four stroke engine: That's one stroke for producing power and three for wearing the engine out.

Offline kwakman

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Re: Exhaust port not centered!!!
« Reply #3 on: February 14, 2012, 02:34:25 AM »
does it line up if you slacken all the bolts up? if not, twisted frame would be a possibility.K.
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Offline jonny500

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Re: Exhaust port not centered!!!
« Reply #4 on: February 14, 2012, 07:07:32 AM »
did you take the same amount off both swing arm bushes
« Last Edit: February 14, 2012, 06:46:06 PM by jonny500 »
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Motorrad

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Re: Exhaust port not centered!!!
« Reply #5 on: February 14, 2012, 08:01:57 AM »
The reason they make frame jigs?

Frame go "boing" when you made last cut?
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Offline 81cr450

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Re: Exhaust port not centered!!!
« Reply #6 on: February 14, 2012, 12:51:35 PM »
I've done a couple on hondas, so keep that in mind but... Your worrying to much, it doesnt have to center in the crotch of the Y. Undo the 2 lower bolts with just the swinger bolt in place loose, Then take the case & just raise it up & down & make sure it fits smoothly in between the other to mounting points. As long as it will pivot into the other 2 mounts smoothly your ok. I'll bet the factory steel frame bike doesnt center the pipe perfect. Sprocket alignment is the key
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Offline sandblaster

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Re: Exhaust port not centered!!!
« Reply #7 on: February 14, 2012, 04:48:42 PM »
Quote from: Motorrad on February 14, 2012, 08:01:57 AM
The reason they make frame jigs?

Frame go "boing" when you made last cut?

Your killing me  :lol:
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The four stroke engine: That's one stroke for producing power and three for wearing the engine out.

Offline MOTOSCOTT

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Re: Exhaust port not centered!!!
« Reply #8 on: February 21, 2012, 01:53:10 AM »
Verified frame is straight. Found the culprit, bad drill on the swing arm thru cases! All squared up and O.K. Amazing how small difference in the angle made a huge difference in the front!

Waiting on rails from JFAB. Its been almost a month , hope all is well.

Thanks for all the support. Full pics on build soon!
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