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Author Topic: 1983 XV500 Cafe Racer  (Read 44177 times)

Offline Barkingmadspeedshop

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Re: 1983 XV500 Cafe Racer
« Reply #10 on: Dec 31, 2012, 19:13:32 »
Do a single carb swap, check and re check your electrical, check the starter and have at it!
1981 SR250 cafe             1980 SR250
1971 CB100/200 Cafe      1983 XT550
1977 KZ200 Cafe             1978 CB125S       
1978 KZ200       
1978 KZ200 Hack             1990 CB125t
1977 XS650 bobber          1999 GSXR600
1978 XS650 bobber          2006 KTM450/525 SMR
1978 XS650
and a bunch of others....

Offline Karlloss

  • Posts: 213
Re: 1983 XV500 Cafe Racer
« Reply #11 on: Jan 01, 2013, 09:48:47 »
Yep I think the single carb is definitely the way forward, just need to figure out what carb and find out if there are any manifolds out there to covert to single carb, any ideas or advice will be gratefully received.

Offline notlob

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Re: 1983 XV500 Cafe Racer
« Reply #12 on: Jan 01, 2013, 10:55:21 »
I would imagine but maybe wrong, that the steering geometry on that bike is very relaxed and would benefit from lowering the front end. Lower the headstock onto the gsxr forks without it being on the main stand and checkout the trail.
“Every time I start thinking the world is all bad, then I start seeing people out there having a good time on motorcycles. It makes me take another look.” >> Steve McQueen

Look at it! God, your project is ... it's everywhere. Your garage looks like you've been committing war crimes against a robot.


Build Threads
1980 Cb750: http://www.dotheton.com/forum/index.php?topic=43860.0
1982 CB900: http://www.dotheton.com/forum/index.php?topic=46733.0

Offline Karlloss

  • Posts: 213
Re: 1983 XV500 Cafe Racer
« Reply #13 on: Jan 01, 2013, 11:38:16 »
Indeed the sterring is lazy and Yamaha used offset triple clamps to compensate for the large amount of trail, I thinking a new frame was the order of the day, however I'll have a look at it as you suggest, I might be able to modify the headstock as the GSXR has much larger bearings than the XV.

Offline notlob

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Re: 1983 XV500 Cafe Racer
« Reply #14 on: Jan 01, 2013, 14:44:52 »
speak with beachcomber he is doing something similar
“Every time I start thinking the world is all bad, then I start seeing people out there having a good time on motorcycles. It makes me take another look.” >> Steve McQueen

Look at it! God, your project is ... it's everywhere. Your garage looks like you've been committing war crimes against a robot.


Build Threads
1980 Cb750: http://www.dotheton.com/forum/index.php?topic=43860.0
1982 CB900: http://www.dotheton.com/forum/index.php?topic=46733.0

Offline notlob

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Re: 1983 XV500 Cafe Racer
« Reply #15 on: Jan 01, 2013, 15:04:51 »
Putting it on the main stand and saying it needs lowering to suit the forks only ensures that both wheels would be on the floor when on the main stand, not ideal anyhow, kinda defeats the object of having a stand. you need to do it with the bike on its wheels only.
“Every time I start thinking the world is all bad, then I start seeing people out there having a good time on motorcycles. It makes me take another look.” >> Steve McQueen

Look at it! God, your project is ... it's everywhere. Your garage looks like you've been committing war crimes against a robot.


Build Threads
1980 Cb750: http://www.dotheton.com/forum/index.php?topic=43860.0
1982 CB900: http://www.dotheton.com/forum/index.php?topic=46733.0

Offline Karlloss

  • Posts: 213
Re: 1983 XV500 Cafe Racer
« Reply #16 on: Jan 01, 2013, 17:07:55 »
I wasn't going to keep the centre stand only need a side stand

Offline notlob

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Re: 1983 XV500 Cafe Racer
« Reply #17 on: Jan 01, 2013, 17:47:25 »
Sorry I didn't really explain myself.
By showing your intentions of making a frame as shown here


It will not keep the original geometry of the frame it will make it worse (relative term) or more relaxed than it was, the center stand is taking the weight off the rear shock so its not sitting correctly and thus unnaturally elevating the headstock. To replicate  the original height of the headstock and geometry you need to let it rest on both its original wheels with the original forks in place. You can then measure the height of the headstock from the ground and the trail if need  be. To replicate this on a new frame.

I dont think I'm  taking a leap in the dark here but the original geometry of this frame could do with sharpening up to get quicker steering more suitable for a cafe racer than a cruiser.

By lowering the headstock, in your case allowing it to sit naturally on the gsxr forks steerer stem , this will achieve the desired improvement is sharpening up the steering.

I dont think you need any frame modifications in that area.

I'm sure someone will come along thats actually fitted different forks to an XV without major frame modification to offer their advise.
« Last Edit: Jan 01, 2013, 17:50:58 by notlob »
“Every time I start thinking the world is all bad, then I start seeing people out there having a good time on motorcycles. It makes me take another look.” >> Steve McQueen

Look at it! God, your project is ... it's everywhere. Your garage looks like you've been committing war crimes against a robot.


Build Threads
1980 Cb750: http://www.dotheton.com/forum/index.php?topic=43860.0
1982 CB900: http://www.dotheton.com/forum/index.php?topic=46733.0

Offline Karlloss

  • Posts: 213
Re: 1983 XV500 Cafe Racer
« Reply #18 on: Jan 02, 2013, 16:27:39 »
Yep I hear what you are saying and agree about having the engine in and off the centre stand, the basic drawings are only to get an idea of frame options. Before I stripped the bike I measured the XV forks and headstock height and compared these to the GSXR1000 and SpeedTriple I have and the XV forks are much longer and the headstock higher, I have no idea why Yamaha did this on the XV500 as the other XV models have a lower headstock, I have looked at the XV535 frame which has the same engine size etc. and the headstock is lower on the 535. 

My I will take your advice and remount the engine and measure the headstock height and yes the standard steering on the XV is very lazy, I intend to reduce the rake to sharpen the steering.

Offline notlob

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Re: 1983 XV500 Cafe Racer
« Reply #19 on: Jan 02, 2013, 21:13:36 »
Most of the forks on older bikes are a good bit longer than more modern ones. But quite a bit longer on the cruiser types of bikes. However looking at the photo I guess that the headstock would be a couple of inches lower when on its wheels and therefore would only have to drop a couple of inches onto those forks. Which may end up being ideal.

If the 535 is lower it maybe better to source one of those frames or go the whole new frame like this build
http://www.dotheton.com/forum/index.php?topic=32065.0
although its an xv1000 or TR1
“Every time I start thinking the world is all bad, then I start seeing people out there having a good time on motorcycles. It makes me take another look.” >> Steve McQueen

Look at it! God, your project is ... it's everywhere. Your garage looks like you've been committing war crimes against a robot.


Build Threads
1980 Cb750: http://www.dotheton.com/forum/index.php?topic=43860.0
1982 CB900: http://www.dotheton.com/forum/index.php?topic=46733.0