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 Post subject: Re: Modern Frame Ideas for RZ500?
PostPosted: Sun May 20, 2018 12:14 am 
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Joined: Thu Jul 21, 2011 9:02 pm
Posts: 62
Location: Outside Carrollton, Georgia
I pulled out some parts today to think about grafting my R6 swing arm to my RZV frame. As I said before, because my frame needs some modification to attach the sub frame again, I am considering what it would take to use the standard R6 swing arm pivot bolt. Has anyone thought about this or actually done the work?

If I modified the frame in this area maybe I could use the R6 arm as is (in the pivot area) and use the larger R6 pivot bolt. The R6 arm fits in the frame until you get to the casting for the pivot mount. I didn't make any measurements but it wouldn't take much width adjustment to fit in the R6 arm. The bosses at the pivot area would need to be enlarged (and threaded on one side) but a quick look makes it seem feasible.

Any thoughts or information? :smt023

Frank S.

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1973 Yamaha AT3 e-start, 1977 Yamaha TY250D, 1985 RZ500, 1987 Suzuki RG500CH, 1991/2014 TZR450F Yamaha, 1991TZ250B Yamaha, 1991 Yamaha TZR250R, 2005 Scorpa SY250R, 2017 Ducati SuperSport939S (for the runners)


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 Post subject: Re: Modern Frame Ideas for RZ500?
PostPosted: Thu Jun 14, 2018 9:16 pm 
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Joined: Fri Oct 12, 2012 1:31 pm
Posts: 10
Location: Nor Cal
I'm probably late to the party, but here's my idea for a modern frame that is RZ500 specific...

ImageDSCN9837 by andbike, on Flickr

ImageDSCN9840 by andbike, on Flickr

The frame is designed to accept most modern (R6, R1, GSXR, etc) front ends. R6 tank and seat. Swingarm will probably be an Aprilia (as in the photos). Wheel base is ~55in. Head angle ~21 degrees.

For reference, the design was based on these bikes which hold an AFM 500cc Twins Championship...

ImageDSCN0096 by andbike, on Flickr

The project is not finished, but I feel very confident that this will be an extremely fun bike when finished. Duplicates frames are available including a duplicate set of the BTR pipes.

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Julian


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 Post subject: Re: Modern Frame Ideas for RZ500?
PostPosted: Thu Jun 14, 2018 10:43 pm 
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Joined: Thu Jul 21, 2011 9:02 pm
Posts: 62
Location: Outside Carrollton, Georgia
Well that frame looks to be pretty modern I'd say. Thanks for sharing. Pretty serious size to the mid section of your pipes, have you ridden a bike with those installed?

You should start a thread and give us a.bunch of details and more photos. I would love to hear more about your project .

Really cool...

Frank S

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1973 Yamaha AT3 e-start, 1977 Yamaha TY250D, 1985 RZ500, 1987 Suzuki RG500CH, 1991/2014 TZR450F Yamaha, 1991TZ250B Yamaha, 1991 Yamaha TZR250R, 2005 Scorpa SY250R, 2017 Ducati SuperSport939S (for the runners)


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 Post subject: Re: Modern Frame Ideas for RZ500?
PostPosted: Fri Jun 15, 2018 1:57 pm 
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Joined: Fri Oct 12, 2012 1:31 pm
Posts: 10
Location: Nor Cal
Thanks for the kind words!

I have not yet ridden anything with these pipes, but given the pipe builders experience I have 100% confidence that the performance will be outstanding. Brian's pipes are known for the fat mid sections as that's the best way to optimize for good mid-range torque. Many other pipe builders keep their pipes much narrower such that original body panels will fit. That is not a concern here.

I'd be happy to answer specific questions, but unlikely to start a dedicated build thread. The project began in 2001 for a paying customer. Our agreement was that I would not charge him for any of the design effort (only the construction effort) and in exchange he would allow me to produce a limited number of duplicate frames to sell as kits. The project went well for about a year or two until I required a second payment installment (still within agreed budget of course). Long story short, the project was eventually abandoned due to unforeseen circumstances with the customer (business + health issues).

I currently have three frames in similar stage as you see in the photos, and rough parts to produce 4 or 5 more. The bike in the photo is my own personal bike which I still hope to complete someday. If someone comes along and wants to purchase one of the frame kits I could be motivated to accelerate the project. Otherwise, it has been a low priority and likely to sit untouched for a few more years.... although talking about it now makes me want to start working on it again :grin:

If you look at the AK-1 (EX500 powered) race bikes that the RZ500 frame's design is based on you'll see they have a very simple swingarm. This is the swingarm I had intended to use, but the shock location is directly in the path of the rear pipes. I love the design of the Aprilia swingarm and is has the added benefit of a lower shock position, so I began to mock-up how it would fit (as seen in the photos). So a fair amount of re-design and re-working of the frame is required to make the Aprilia swingarm work, but that is the current direction. What looks like an ugly rear sub-frame in the photo is actually just a fixture for locating the rear pipes while they were being built. It will eventually be replaced with a proper sub-frame.

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Julian


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 Post subject: Re: Modern Frame Ideas for RZ500?
PostPosted: Thu Jun 21, 2018 7:23 am 
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Joined: Sat Nov 12, 2011 10:50 pm
Posts: 215
Location: Adelaide, South Australia
Hi Julian I'm keen to find out more on those BTR pipes.
The RZ500 in the back ground are the same pipes.
Cheers Ron.


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 Post subject: Re: Modern Frame Ideas for RZ500?
PostPosted: Thu Jun 21, 2018 2:34 pm 
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Joined: Thu May 24, 2018 5:22 pm
Posts: 56
the frame looks formidable.
from here it looks like the pipes on the rz aren't as fat - maybe for stock bodywork?
either way they "sure would like to have" pipes.


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 Post subject: Re: Modern Frame Ideas for RZ500?
PostPosted: Thu Jun 21, 2018 3:37 pm 
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Joined: Fri Oct 12, 2012 1:31 pm
Posts: 10
Location: Nor Cal
Ron57 wrote:
Hi Julian I'm keen to find out more on those BTR pipes.
The RZ500 in the back ground are the same pipes.
Cheers Ron.


Hi Ron, Here are a few more details about the pipes... Brian (BTR) makes each set of pipes to order. He has fixtures for many different bikes and pipe configurations, however he often builds the pipes directly to the customer's bike thus taking into account any modifications made to the bike. For example, I have a TZR swingarm that will eventually be put on an RZ350. Because this allows for the shock and linkage to be relocated a few centimeters higher, Brian was able to take advantage of the added clearance when building GP style pipes for this specific application.

Because he is a one-man shop (also doing engine building, chassis modifications, and many other things) thus his pipes are not produced in larger quantities. Unfortunately this makes it more challenging for people in other geographical areas to get pipes from him. He is also so busy that he doesn't advertise, although he sometimes lurks on this forum and several folks here have his contact info.

Here's a photo of a few more sets he's made for my projects. Also should be mentioned that he does not make silencers, so you need to provide your own (I use TZ Mike's)...

left to right: AY-1/RZ500, RZ350 GP style, RZ250R GP style

ImageDSCN9949 by andbike, on Flickr

ImageDSCN9953 by andbike, on Flickr

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Julian


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 Post subject: Re: Modern Frame Ideas for RZ500?
PostPosted: Thu Jun 21, 2018 3:41 pm 
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Joined: Fri Oct 12, 2012 1:31 pm
Posts: 10
Location: Nor Cal
lost1750GTV wrote:
the frame looks formidable.
from here it looks like the pipes on the rz aren't as fat - maybe for stock bodywork?
either way they "sure would like to have" pipes.


You are correct in that the pipes on the RZ500 are not as fat. That bike belongs to a friend of mine, so we had Brian make several sets of pipes at same time. Now if I could just get these projects finished :sad:

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Julian


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 Post subject: Re: Modern Frame Ideas for RZ500?
PostPosted: Thu Jun 21, 2018 9:38 pm 
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Joined: Mon Sep 14, 2015 12:30 pm
Posts: 634
Location: Bay Area. CA.
I have a set of Brians pipes and they are a fantastic fit and look even better, I used a set of TZ mike carbon cans,


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