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Old 03-06-2013, 05:37 PM   #1
woahblackbetty OP
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1979 xr500

Picked this little under-powered toy over the weekend. ;D ;D

1979 XR500





The seat needs to be rebuilt. Mice got into it and built themselves a nest in the airbox. Had a lot more power once that was cleaned out.


Still needs a tune up to be 100%, currently running a can of seafoam and tank of fresh gas through it. Will be catching all the standard maintenance points in the coming weeks

Original owner's manual was in a ziploc bag in the tool bag.


Tucked into the lineup... One oddball rectangular light!
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Old 03-06-2013, 05:45 PM   #2
Canuman
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That's one sweet line-up!
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Old 03-06-2013, 05:52 PM   #3
stiggs13
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Nice pick up

What year is the CT-90?
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Old 03-06-2013, 06:10 PM   #4
woahblackbetty OP
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Quote:
Originally Posted by Canuman View Post
That's one sweet line-up!
Thanks!!

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Originally Posted by stiggs13 View Post
Nice pick up

What year is the CT-90?
Honestly not sure, it's a friend's bike that I'm slowly piecing back together for him.
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Old 03-06-2013, 07:50 PM   #5
Gadget Man
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Wink

I once owned a 1979 XR 500. I bought it brand new in 1980.
It was never meant to be street legal. But "back in the day" I went to the license bureau and just told them it was a Honda 500 and they gave me a plate.
I bolted it right on the rear fender and rode that bike all over northern Minnesota for several years. I called it my two wheeled tractor. It was a great bike.

I also had a 1972 Honda CT 90. Another awesome bike. It had the high/low gear box with the automatic 4 speed.

I would love to find either one of those bikes for sale today.

Good luck.
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Old 03-11-2013, 02:04 PM   #6
woahblackbetty OP
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I've been naughty again...


GS500 wheels, axle diameters match to the XR500. Just need to get calipers & master cylinders sorted. The front wheel is already drilled & tapped from the factory for dual disc. Chain pitches match also! Like it was meant to be...
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Old 03-11-2013, 04:17 PM   #7
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Positive proof of concept...



A minor interference that will have to be rectified. This lug mates to the original front hub and secures the drum brake.

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Old 03-11-2013, 06:40 PM   #8
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Old 03-11-2013, 08:39 PM   #9
Carter Pewterschmidt
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Dig the vintage sumo concept. Plan on doing that to my XL600R. Are those Suzuki GS500 wheels?
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Old 03-11-2013, 09:23 PM   #10
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Originally Posted by Carter Pewterschmidt View Post
Dig the vintage sumo concept. Plan on doing that to my XL600R. Are those Suzuki GS500 wheels?
Yessir!!
The GS500 and XR500 share front and rear axle diameters (15mm front & 17mm rear) as well as chain pitch (520).
Simple drop in and install spacers front & rear, up the rear sprocket to a 49T (JT Sprockets makes one) which is the closest match to the original 14/48 ratio of the XR500.
Going from a 130/80-18 to 130/70-17 isn't too bad of a drop and the 1T higher on the back will give a slight torque increase (because an XR500 really needs more torque right??)
Obviously still have to get calipers & master cylinders squared away. I'm planning on using a KLR600 front wheel paired with the stock XR500 rear wheel for offroading. The KLR600 is also a 15mm front axle so I'll have to make sure that whatever my solution for front brakes is adaptable to that hub configuration.

woahblackbetty screwed with this post 03-11-2013 at 09:29 PM
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Old 03-14-2013, 01:19 PM   #11
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After some consideration I have decided to try rotating the fork tubes 180* to remove the interference of the drum brake lug.
This will hopefully also allow me to utilize that lug out in front as a mounting point for part of the front caliper bracket.







I have a line on a GS500 rear caliper and front disc locally. Those parts plus the other farkles I'm collecting along the way have me simply needing to fab brackets and wheel spacers!
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Old 03-15-2013, 07:19 AM   #12
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49T rear sprocket is virtually the same size as the rear disc.
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Old 03-15-2013, 09:30 PM   #13
wrk2surf
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NICE!!

bam balam!
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Old 03-16-2013, 04:12 AM   #14
Pigford
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I think you may have some serious handling issues reversing leading axel forks The wheel will have a tendancy to "drop-in"

Good to see you giving it the personal treatment..... but not to my liking, but hey-ho thats what makes bikes so interesting

Heres my old XL500R...... great little bikes



Took me to Le Mans a couple of years back..... ENJOY
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Old 03-19-2013, 08:36 AM   #15
woahblackbetty OP
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Originally Posted by Pigford View Post
I think you may have some serious handling issues reversing leading axel forks The wheel will have a tendancy to "drop-in"
Yeah, I've already rotated the tubes back around the right way and swapped them left to right. That puts the axle back in front and moves the drum mounting lug outboard & clear of any interference.
Have to fab my wheel spacers so I can finish up the bracket design for the front caliper. I have the option of a radial mount or standard mount. Unsure yet which way I'll go...


Obviously this isn't where I'll mount it if I go standard, I'll sling it behind the fork leg.


Quote:
Originally Posted by Pigford View Post
Good to see you giving it the personal treatment..... but not to my liking, but hey-ho thats what makes bikes so interesting
This is going to be one configuration for the XR. I'm working on securing a 21" front wheel with disc brake setup so I can run that with the stock 18" rear when I want to hit the trails hard. None of my modifications involve cutting the frame. I'm welding a couple of brackets at the back for the rear caliper stabilizer but I can swap back to the stock setup without a problem.


Quote:
Originally Posted by Pigford View Post
Heres my old XL500R...... great little bikes



Took me to Le Mans a couple of years back..... ENJOY
That's one sweet looking bike!
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