Author Topic: reVision racer  (Read 451 times)

cbx550

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reVision racer
« on: August 14, 2018, 04:59:10 PM »
My 1982 Vision race bike has successfully completed it's second race weekend with the VRRA.  Purchased in spring of 2017 as a non-runner project bike, it later appeared to be a bit of a junkyard dog.  Various parts had the tell-tale white paint marks identifying them as "1982 Vision".  Issues: Earwig in the fuel pump!, bodged wiring, and gear shifter upside down (GP shift!). I got as far as getting it running in 2017 to determine if it's a project or parts bike.

Race bike build began in earnest in May (it was a long winter, and April was still cold in the garage) and made it's track debut the next month at the VRRA June event, which is also the first time I ever rode the bike.  A lot of time was spent just trying to patch up the rusty gas tank. It's difficult to weld to thin rusty steel.  I swapped on an NT650 front end and clip-ons.  With the soggy stock shock and MAC pipe that came with the bike, ground clearance was an issue on the right hand side first time out. 
1982 Vision Race Bike UV-1

jefferson

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Re: reVision racer
« Reply #1 on: August 15, 2018, 11:15:28 PM »
From that picture it's hard to tell if you are on the brakes or throttle. It appears those forks may be shorter than the stockers which is going to give you less ground clearance, but then you may be on the brakes just not hard as can be determined by your zip ties. I would imagine the brakes are quite a bit better with that caliper versus the stocker. Keep us updated on your experiences racing and what you do to the bike. I can see a pretty good thread coming from this.

fret not

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Re: reVision racer
« Reply #2 on: August 15, 2018, 11:34:25 PM »
CBX, is that a catch pan or part of a fairing under the motor?  Is this something required by current rules?
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jefferson

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Re: reVision racer
« Reply #3 on: August 16, 2018, 01:38:58 PM »
You have a pm from me.

Rikugun

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Re: reVision racer
« Reply #4 on: August 17, 2018, 08:42:07 AM »
Further to Jefferson's comments re possibly shorter forks... I wonder what effect on steering geometry and handling that may have. Also about rake/trail, what about the fork being a center axle design? Did the fork swap also have modification to account for that?

Quote
CBX, is that a catch pan or part of a fairing under the motor?  Is this something required by current rules?
Since that was handled in PM and others may be curious....
There was a discussion on another forum w/a vintage racer and while it was not current to this season, the catch pan was required. For wet sumps like the XZ the capacity had to match oil quantity. The dimensions had to protect the case, gearbox, and oil filter. There were rules regarding acceptable materials and likely other rules I'm not aware of.  :D I think there was a recommendation regarding having oil absorbent material in the pan suitable for that quantity of oil but it was not a requirement as of that discussion.
« Last Edit: August 17, 2018, 10:14:04 PM by Rikugun »
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cbx550

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Re: reVision racer
« Reply #5 on: August 17, 2018, 09:29:01 PM »
Race 1 the VRRA required oil containment pan was scraping on the right side due to the layout of the MAC front pipe and soggy rear shock.  I salvaged a Wolfe exhaust can from a free parts bike (the balance of the Wolfe pipe was too far gone) and fabricated a new transition with a few pieces of mandrel bent tubing.  A CBR shock was installed before Race 2 and handling is much improved.
1982 Vision Race Bike UV-1

cbx550

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Re: reVision racer
« Reply #6 on: August 17, 2018, 09:34:11 PM »
One of the next things I want to try are Venture carbs.  See my posting under carburetors.
1982 Vision Race Bike UV-1

fiat-doctor

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Re: reVision racer
« Reply #7 on: August 18, 2018, 09:40:24 AM »
Nice work on the pipes!  Your welding skills FAR exceed mine  :)

Thanks for sharing your bike with us.  Race bikes are always interesting and not often do
we get to see a Vision racer.

cbx550

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Re: reVision racer
« Reply #8 on: August 19, 2018, 09:29:49 PM »
Some arts and crafts this afternoon.  My Vision race bike, Version 1.
1982 Vision Race Bike UV-1

jefferson

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Re: reVision racer
« Reply #9 on: September 03, 2018, 04:25:38 PM »
You have some pm's.

cbx550

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Re: reVision racer
« Reply #10 on: September 08, 2018, 11:23:58 AM »
The old Wolfe pipe gave up the ghost. Luckily through the generosity of the VRRA membership I was able to borrow a Hindle muffler for an SV650 and cobbled together a fix to keep racing for the weekend.  I call it a Bassooni pipe.
1982 Vision Race Bike UV-1

jefferson

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Re: reVision racer
« Reply #11 on: September 08, 2018, 06:51:43 PM »
Did you notice any difference in the way the bike ran and does it sound better?

cbx550

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Re: reVision racer
« Reply #12 on: September 08, 2018, 10:20:25 PM »
I was hoping for a deep bass sound. 

I was running with the new Venture carbs setup without the airbox lid so it was hard to hear the exhaust over the intake noise.
1982 Vision Race Bike UV-1

Rikugun

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Re: reVision racer
« Reply #13 on: September 09, 2018, 08:36:55 AM »
Non exhaust related - I noticed something that seemed odd about the brake stay fastener on the backing plate. Is it backwards? It looks like the head of the bolt is facing out. I'm assuming it has to have some type of safety hardware. Is it on the back?
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Walt_M.

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Re: reVision racer
« Reply #14 on: September 09, 2018, 02:17:58 PM »
That bolt is very important for the obvious reason. It is installed backwards on that bike. The backing plate has a cast hex for the stock shouldered bolt head and the bolt is drilled for a cotter pin.
As for the intake noise, I left the top off mine as a test during my FZR600 carb swap and it sounded horrible.
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cbx550

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Re: reVision racer
« Reply #15 on: September 09, 2018, 07:18:42 PM »
Sharp eyes. The brake bolt is not installed backwards. I repurposed a piece from old Honda automotive wire hose clamp as a backup nut plate with four holes. I use one of the holes to safety wire to prevent loosing the brake bolt. So the bolt is secured with a backup nut and is safety wired.
1982 Vision Race Bike UV-1

fiat-doctor

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Re: reVision racer
« Reply #16 on: September 10, 2018, 07:11:56 AM »
We are talking about the bolt for the brake stay arm at the backing plate, not the nut for the brake adjuster.   It does look from the picture that it is in backwards.

cbx550

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Re: reVision racer
« Reply #17 on: September 10, 2018, 08:40:37 PM »
Indeed I have the brake stay bolt in backwards, but it is cotter pinned. I compared it with the parts bike.
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fret not

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Re: reVision racer
« Reply #18 on: September 11, 2018, 12:35:48 AM »
. . . . compared it to the parts bike . . . . . .   Yeah, someone has been there before and left it in a non stock condition.  Just like looking at my 'parts bike' I can not trust the routing of the wires and hoses because they have been  previously 'disturbed'. 

The head of your brake stay bolt should fit into the cast recess on the back side of the backing plate (the hex head should snugly fit into the hex recess to keep it from turning).  The locking nut and cotter pin should be on the outside.  It may help a bit to look at parts fiches to see the order and direction of the parts.  10 years behind a parts counter has taught me that there is a lot of information in the parts manuals (micro fiches now).  We used to have paper books to leaf through, but now everything is microfiches, AND with the internet we can access all that material from a vast number of dealers on line.  How handy is that? ;)
Retired, on the downhill slide. . . . . . . . still feels like going uphill!

Rikugun

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Re: reVision racer
« Reply #19 on: September 11, 2018, 08:05:26 AM »
Perhaps something more like this. The clip could be replaced with a cotter pin if tech inspection preferred but either way it's easier to get to facing out. This is a 10 mm shouldered bolt meant for  brake stay attachment rather than the stepped down 8mm threads on the stock bolt that has been shown to fail on occasion. Oh, BTW, that's a lock nut and a clip - belt and suspenders!
« Last Edit: September 11, 2018, 08:07:31 AM by Rikugun »
It is far better to grasp the universe as it really is then to persist in delusion, however satisfying or reassuring.  Carl Sagan