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Author Topic: 1983 XV500 Cafe Racer  (Read 45052 times)

Offline rundown

  • Posts: 260
Re: 1983 XV500 Cafe Racer
« Reply #20 on: Jan 02, 2013, 23:40:55 »
It looks lilke the frame is going to be a major problem.  I believe you might be able to cut the whole front of the frame off and lower and rake the steering head more vertical.  that said, this seems pretty complicated to do without a jig and some pretty sophisticated measuring tools.  Perhaps you can source another frame?

Offline biker_reject

  • Posts: 2147
Re: 1983 XV500 Cafe Racer
« Reply #21 on: Jan 03, 2013, 17:16:34 »
I think I'd have a go at trying out the gixxer fork and tree set up before chopping up the headstock, of course, I chopped on my frame.  Just on the opposite end.  Ha!  Check my thread.  See what you think. 

Offline Karlloss

  • Posts: 213
Re: 1983 XV500 Cafe Racer
« Reply #22 on: Jan 03, 2013, 17:18:36 »
Notlob, cheers for the link, that build is not too disimillar to one of my solutions, thanks for pointing me in the right direction.

Offline Karlloss

  • Posts: 213
Re: 1983 XV500 Cafe Racer
« Reply #23 on: Jan 05, 2013, 13:33:43 »
Ok, so I have remouted the engine and tried both the orginal forks and the GSXR forks for comparison before I do any cutting and chopping. As you can see from the pictures running the GSXR front end without frame modifications would reduce the ground clearance too much, although the rake angle has improved, i.e. reduced to sharpen the steering.

Offline full on tin

  • Posts: 73
    • www.benjaminfullerton.com
Re: 1983 XV500 Cafe Racer
« Reply #24 on: Jan 05, 2013, 16:24:38 »
Love xv builds. Exciting to watch if you do try and tackle the geometry change. but, when you mocked it up with the suspension loaded it looked pretty mean and lunging forward.

-What tank are you running? will it cover up most of the area you plan to tweak?
-Do the GSXR bearings match up to your headset? or do they require mods?
-Any plans for the rear wheel? This is the one area of these bikes i dislike. I've seen some conversions, but they seen like a big task with the differential. Friend of mine found a chain drive XV, lucky guy. 

Cheers, keep it up!

Offline cbSteve

  • Posts: 33
Re: 1983 XV500 Cafe Racer
« Reply #25 on: Jan 05, 2013, 18:14:27 »
Just looking at the pictures, I think it looks perfect with the GSXR forks. I know nothing of geometry, trail and suspension, so don't mind me. Yes , I see that you loose some ground clearance and that is maybe not good. Maybe a little in this case will be ok. Maybe you can make up a little in the back with a taller rear tire? I don't know but with the right seat and tank it could look very good!  This post is of little use but I really dig the pic of the modes so far. Good luck. Thanks for sharing and I will continue to watching!

PS sometimes if you keep the modes simple  you have a better chance of finishing and getting to ride the bike (ask me how I know ;))
« Last Edit: Jan 05, 2013, 18:26:19 by cbSteve »

Offline biker_reject

  • Posts: 2147
Re: 1983 XV500 Cafe Racer
« Reply #26 on: Jan 05, 2013, 23:39:50 »
The thing is, we aren't exactly going to be dragging knees with these things, are we?  Of course, you'll be using a 17" gixxer wheel.  I opted for 18"'ers on both ends.

Offline Karlloss

  • Posts: 213
Re: 1983 XV500 Cafe Racer
« Reply #27 on: Jan 06, 2013, 05:44:56 »
[quote author=

-What tank are you running? will it cover up most of the area you plan to tweak?
-Do the GSXR bearings match up to your headset? or do they require mods?
-Any plans for the rear wheel? This is the one area of these bikes i dislike. I've seen some conversions, but they seen like a big task with the differential. Friend of mine found a chain drive XV, lucky guy. 

Cheers, keep it up!
[/quote]

I haven't decided on a tank yet, the standard tank is awful and uses the return flow vacuum fuel tap/pet cock with a fuel pump, so I'm going to bin that and use a tank from something else. The issue is that the XV frame is wide as the airbox is part of the frame above the carbs, I was thinking of constructing a twin spar frame to allow conical air filters to be mounted on the downdraft carbs, as I like the look of the V-twin engine without a side draft carb obscuring the view, however as the standard carbs have a pressure restricted float cut off as standard the bike uses a fuel pump, I have decided the best option is to go with a single side draft carb, this should also allow me to use a single tube backbone frame.

The GSXR bearings don't match the XV headstock as the GSXR uses tappered roller bearings and the XV uses ball bearing races, however the steering shaft is the same diameter top and bottom and the same length and has the same threads, in fact the XV shaft looks more substantial, would you believe. As it looks like I'm going for a complete new frame I'll get a headstock machined up, it can't be that expensive.

I had plan with the rear wheel, of at least I thought I did, I was thinking of using another GSXR front wheel, this would give me the advantage of being able to use a disc rather than drum, my thoughts were that the width of the hub of a GSXR front hub would be narrow enough to mount the spline drive for the XV and still keep the wheel centred, however it's a no go, so I'm looking at using a spoked hub from an XV 535 and changing the rim to either a 17" or 18" as the 535 uses a 15" rim, more expense but I'll leave the wheels to last, as I'm trying to do this on a budget.

Offline Karlloss

  • Posts: 213
Re: 1983 XV500 Cafe Racer
« Reply #28 on: Jan 06, 2013, 05:53:07 »
I agree it does look good with the forward stance on the GSXR front end, although this is just with static sag and no other compontents on the bike, no fluids and no rider, and as much as I'd like to think I'm lean and slender, I'm far from it at 210 pounds, so I'll aim for a bit more ground clearance.

Offline notlob

  • DTT BOTM WINNER
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  • Posts: 656
  • Made in England
    • CB750 Brat Bobber Build Thread
Re: 1983 XV500 Cafe Racer
« Reply #29 on: Jan 06, 2013, 12:38:44 »
You do have a headache there Karloss.
Ground clearance doesn't look great and with the addition of evrything else and a rider its only getting worse. If your not dead set on USD forks try the early 2000 zx9r c and e model RWU forks they are longer than recent USD forks and fully adjustable. I Have a set ready to go on a cb900 so can let you have the measurements.
I'm presuming the rear wheel is 18" and the front 18" or 19" so keeping the original front wheel and making it fit the gsxr forks would give you some more clearance but maybe not enough. But would give you matching wheels and negate the further headache of reengineering a back wheel.
Maybe a frame redesign is the better option but no less complicated.
I think which ever way you go is not going to be easy and straight forward.

Good luck
“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