KX Riders

Maintenance & Technical => KX500 Aluminum Frame Conversion (AFC) => Topic started by: MOTOSCOTT on February 13, 2012, 03:19:17 PM

Title: Exhaust port not centered!!!
Post by: MOTOSCOTT 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)

Title: Re: Exhaust port not centered!!!
Post by: Motorrad on February 13, 2012, 03:54:21 PM

Hmm thinking what it could be..     

Waiting on pics

Title: Re: Exhaust port not centered!!!
Post by: sandblaster 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?

Title: Re: Exhaust port not centered!!!
Post by: kwakman 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.

Title: Re: Exhaust port not centered!!!
Post by: jonny500 on February 14, 2012, 07:07:32 AM

did you take the same amount off both swing arm bushes

Title: Re: Exhaust port not centered!!!
Post by: Motorrad on February 14, 2012, 08:01:57 AM

The reason they make frame jigs?

Frame go "boing" when you made last cut?

Title: Re: Exhaust port not centered!!!
Post by: 81cr450 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

Title: Re: Exhaust port not centered!!!
Post by: sandblaster 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:

Title: Re: Exhaust port not centered!!!
Post by: MOTOSCOTT 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!