Author Topic: 1990 KX 500 to 2006 KX450F Conversion Project  (Read 47785 times)

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Offline don46

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Re: 1990 KX 500 to 2006 KX450F Conversion Project
« Reply #30 on: February 17, 2015, 01:05:37 PM »
and as for a pipe from Service honda,  you will still end up denting it around the water fixture if you don't use the up pipe on the water nipple. The CPI fits like a glove but its expensive and big so it is probably susceptable to denting.
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Offline don46

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Re: 1990 KX 500 to 2006 KX450F Conversion Project
« Reply #31 on: February 17, 2015, 01:06:33 PM »
Here's a look at here from yesterday, from the back left side.


is this a MPS conversion?
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Offline don46

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Re: 1990 KX 500 to 2006 KX450F Conversion Project
« Reply #32 on: February 17, 2015, 01:07:28 PM »
never mind I went back to the beginning
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Offline Kwackerman

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Re: 1990 KX 500 to 2006 KX450F Conversion Project
« Reply #33 on: February 17, 2015, 01:07:43 PM »
That's great news about the hose.  I wondered if anyone other than SH had those.

I'll call my buddy to see if he's already cut the pipe.  If he hasn't I'll tell him to hold off till I can get a hose.  That'll save me some $.

Offline sandblaster

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Re: 1990 KX 500 to 2006 KX450F Conversion Project
« Reply #34 on: February 17, 2015, 01:08:49 PM »

I will also say that the first AF framed bike I did was similar to your frame rails, I will caution you to watch them very closely because they will break, after the second time I gutted it, bent all new frame rails using radiused tubing and gusseted both the top and bottom.

Hey Don.
Just curious, did you heat treat the frame when done?
The four stroke engine: That's one stroke for producing power and three for wearing the engine out.

Offline Kwackerman

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Re: 1990 KX 500 to 2006 KX450F Conversion Project
« Reply #35 on: February 17, 2015, 01:10:13 PM »
This is a MPS main frame modification, with a MPS designed Dynoport pipe.  

Everything else is either stock or aftermarket, all bought off EBay.

The motor is my original 1990 KX 500 I've owned since new...

Offline Kwackerman

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Re: 1990 KX 500 to 2006 KX450F Conversion Project
« Reply #36 on: February 17, 2015, 01:38:40 PM »
Here's a close up shot from the side of the front engine mounts.

Offline Kwackerman

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Re: 1990 KX 500 to 2006 KX450F Conversion Project
« Reply #37 on: February 17, 2015, 01:40:23 PM »
Here's a shot of the back side of the main frame down tube.  It's not the prettiest welding job I've ever seen, but it's heavy duty.

Offline Kwackerman

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Re: 1990 KX 500 to 2006 KX450F Conversion Project
« Reply #38 on: February 17, 2015, 01:41:41 PM »
Here's the main frame down tube from the front.  It looks cleaner than the back side.

Offline Kwackerman

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Re: 1990 KX 500 to 2006 KX450F Conversion Project
« Reply #39 on: February 17, 2015, 01:42:52 PM »
This is the underside of the bottom engine mount.

Offline Kwackerman

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Re: 1990 KX 500 to 2006 KX450F Conversion Project
« Reply #40 on: February 17, 2015, 01:44:19 PM »
This is the front side of the front engine mount, and you can see the cool looking head stay.

Offline Kwackerman

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Re: 1990 KX 500 to 2006 KX450F Conversion Project
« Reply #41 on: February 17, 2015, 01:46:36 PM »
One other pic of the ill-fitting "custom" pipe.  It sits so tight on top of the oil fill cap you can't even turn it, much less remove it.
I'll post some pics of the finished product this weekend.


Offline don46

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Re: 1990 KX 500 to 2006 KX450F Conversion Project
« Reply #42 on: February 17, 2015, 02:26:11 PM »

I will also say that the first AF framed bike I did was similar to your frame rails, I will caution you to watch them very closely because they will break, after the second time I gutted it, bent all new frame rails using radiused tubing and gusseted both the top and bottom.

Hey Don.
Just curious, did you heat treat the frame when done?

I did several that were not heat treated, after all the discussion on this site, I had a guy heat treat it. honestly couldn't tell the difference, but then it hasn't been that long. I do think the biggest thing is the radiused tubing.
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Offline Charlie500

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Re: 1990 KX 500 to 2006 KX450F Conversion Project
« Reply #43 on: February 17, 2015, 02:59:54 PM »
Dang man, I hate to say this but it sure seems like mps should be doing better work than this... They've been in the game for a long time and this don't look very good... No offence to anyone, just my personal opinion.

If i were to pay someone to do work i would expect it to looks something like this...

http://www.bannedcr500riders.com/board/viewtopic.php?t=8666&postdays=0&postorder=asc&start=75

« Last Edit: February 17, 2015, 04:27:23 PM by Charlie500 »
2014 KX 450 Bark-Buster

Offline jBernard

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Re: 1990 KX 500 to 2006 KX450F Conversion Project
« Reply #44 on: February 17, 2015, 07:26:31 PM »
man, i never like to negatively comment on someones thread. but i almost have to say something here :/
that is a HORRID. i mean absolutely ATROCIOUS fabrication job. I'm sorry you paid 1k for that. But for me that would be in no way shape or form acceptable.
Those welds look like someone who has tig'd aluminum for a week can do. That bottom frame rail is NOT supposed to be bent, and i have no idea how the motor mount is straight vertical inline if it is even slightly off.

like charlie500 posted. check out stoeffers work. thats what it should be looking like. that guy is pretty dang good.
service honda is another good one.

and i saw you knock on SH. here's my .02$ on them... AJ (owner) is a good guy. they seem to try hard to sell a COMPLETE service honda product. how much so? so much so they start with NOS parts on every single piece and build a motor so its 100% fresh. so i can slightly understand that they dont want to sell hoses, pipes, ect for people to use on their personal build. is that right? mehhhhhh i dont know what i would do in the same position, but its not my decision. take it with a grain of salt and maybe not take it so personal. no big deal.

nothing against your or your stuff at all. i'm not a fan of MPS at ALL and try and steer people away from him.
and is that dynoport pipe built from scratch? it almost looks like a cr500 pipe with a piece chopped into it to get it clearance off the right side case.

sorry not trying to come off as rude buddy.
'09 KX500AF - never ending project
'14 KTM 300SX