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Tigcraft / RZ350... the next chapter!

Frame Maker

New member
Joined
May 8, 2011
Location
Livermore
Moto(s)
sportbikes, dirtbikes, and some odd bikes that I've built myself.
Name
Julian
As mentioned in the General sub-forum, I recently acquired an unfinished Tigraft RZ350 project. I'm starting this new thread as a place to show updates and to dive deeper into technical discussion about this amazing bike.

If you didn't catch the intro thread over on General, here's the brief back-story...

"About two years ago I would come to learn that a Tigcraft RZ350 was within two hours drive from me. Around this same time I started becoming good friends with Dave Pearce, the man behind Tigcraft. Although Dave was very opinionated and didn't always get along well with other frame builders, he and I had a good relationship with very high regards for each other's work. Because of this, I thought it would be of great amusement to arrange a photo of Dave's RZ350 based bike side by side with mine.

The Tigcraft bike had originally been commissioned by a well known 2-stroke builder in the UK. As fate would have it, the person who had commissioned the bike didn't care for the bodywork that Dave intended to use. They had a falling out and the project was abandoned. Eventually the frame was sold off to moto enthusiast in the middle east. That person also never finished the bike and put it up on eBay where it didn't sell. About a year later a young man in Salinas discovered the outdated eBay listing while searching for a track-bike project. He contacted the seller and arranged to have the frame shipped to the US.

Jonathan, the new owner, and I connected about two years ago with some conversation about hiring me to complete the build. The bike still needed a proper sub-frame constructed and mounting brackets for various bodywork and accessories to be added. This was great and got me thinking how fun it would be to get a photos of both bikes, if not a photo of the Tigcraft in MY shop! Dave would have filliped his shit!

Unfortunately Dave passed away earlier this year and the opportunity to get the photo never happened. Then yesterday I just happened to click on the FaceBook RZ350 forum just as Jonathan had posted that he was putting the Tigcraft up for sale.

"I want it!" was my first reply. Turns out about five other people also wanted it. Because I was the first to respond, and also because Jonathan though I'd be the most appropriate buyer, I was given priority. Its not easy getting large sums of cash late on a Saturday afternoon, but I made it happen. I met Jonathan at his home in Salinas last night. And as they say, the rest is history.

Today I was finally able to get the photos I had hoped to get two years ago. Side by side the two bikes are remarkably similar in overall geometry. When measuring, the numbers aren't exactly the same, but overall I'm really intrigued by the similarities. I can only hope that Dave is looking down with a large grin on his face. RIP Dave Pearce. You have made something amazing that I am very proud to be given the responsibility to finish."


Seen here without bodywork, and BTR pipes (built for a different bike) temporarily mounted:

20221120_152148 by andbike, on Flickr
 
After seeing side by side photos of the Tigcraft RZ350 and my own A-N-D AY-2 RZ350, ducbsa had this question..."Those swingarms seem so long, what is the wheelbase? My ‘07 Buell is 52”."

Here's my A-N-D AY-2 for reference:

20221120_152201 by andbike, on Flickr

Here is a comparison between the two bike by the numbers...

Tigcraft

S/A length: 2008 Yamaha R6 ~22-1/2"
Wheel base: ~55"

A-N-D AY-2

S/A length: Yamaha TZR250 3XV ~23-1/2"
Wheel base: ~56"

I believe these S/A lengths are relatively common for modern sport bikes. In general a longer swingarm has advantages as it allows for less angular rotation through a similar amount of vertical travel when compared to a shorter swingarm. This keeps the rear of the bike more stable as less angular change has less adverse changes to squat/anti-squat characteristics (especially under acceleration).

More importantly, on smaller motos a longer swingarm helps with optimizing weight distribution. On small/lighter bikes its advantageous to have a forward weight bias (this is less important on heavier bikes). So with a longer swingarm combined with forward engine placement weight can be biased forward.

On the prototype AY-2 weight bias was close to 55%/45% - front/back. This is similar to a small GP bike (TZ250). I'll also note that the prototype bike in street trim with 1/2 tank of fuel is just under 300lbs.

_____________________________________________________________

Next steps for the Tigcraft are in finding proper bodywork. The previous owner included a fuel tank from a Ducati 996, race tail from some Honda sport bike (Fireblade maybe?), and front fairing from a late model Yamaha R1. Needless to say, it all mismatched and doesn't look good as a set. So I'm exploring different tank options and different seat/tail options. Possibly an R6 tank and Honda RS125 tail, but nothing has been finalized.

While the search for bodywork continues, I will need to re-build the Banshee engine that came with it. The engine currently has a seized crank, very worn out clutch basket, and who knows what I'll find once the crank cases are split.

Stay tuned as this chapter is just beginning! :party
 
Last edited:
Are those Daytona wheels on the TigCraft?

Agreed, 55" or 1400mm seems to be a standard for modern sportbike geometries. Somehow my goofy 690 Duke gets away with 58in.

Subscribed!

-Tom
 
Thanks everyone for following. I hope to have some updates on bodywork selection in a few weeks.:thumbup

Are those Daytona wheels on the TigCraft?

Agreed, 55" or 1400mm seems to be a standard for modern sportbike geometries. Somehow my goofy 690 Duke gets away with 58in.

Subscribed!

-Tom

The wheels are 2008 Yamaha R6. Nothing fancy.

As for wheelbase, my personal experience is that a few degrees difference in rake has a much more impact on turning performance than does a few inches of change to wheel base... 54", 55", 56'', 57"... all good.:party
 
Hi Julian,
Do you know what gauge the tubing is on the Tigcraft? Looks like 1" diameter?
Cheers!
 
Hi Julian,
Do you know what gauge the tubing is on the Tigcraft? Looks like 1" diameter?
Cheers!

The tubing diameter on the Tigcraft is mostly 1-1/8". Hard to tell the gauge (wall thickness) but I would assume 0.065".
 
Great looking projects.I have admired Tigcraft chassis for many years. I was just gearing up to revive my old RZ500/NC30 Honda chassis special l first got running back in 2000 out of storage soon.Glad l never sold it off now!!
Be fun to follow your progress as these old 2-strokes seem to be as fun as ever to play with.��
 
Great looking projects.I have admired Tigcraft chassis for many years. I was just gearing up to revive my old RZ500/NC30 Honda chassis special l first got running back in 2000 out of storage soon.Glad l never sold it off now!!
Be fun to follow your progress as these old 2-strokes seem to be as fun as ever to play with.��


Well, there you go. You had to go and mention RZ500s!!! :twofinger Now someone is going to have to start an RZ500 project thread:party

And glad you like the projects!:thumbup

Here's my 500 teaser pic....

DSCN9837 by andbike, on Flickr
 
Oh behave! Outrageously cool - the design of the cnc rear section of the frame is absolutely terrific. Do tell more!

Modern expansion chamber design on the slower revving motors creates some packaging problems, eh? Difficult to tuck those fat bellies in when the pipes are longer...I know the feeling these days, well the fat belly bit anyway... :)
 
Oh behave! ... Do tell more!

I normally don't like to hijack threads and go off-topic, but this is my thread, so here's the condensed history on the RZ500 project...

Back in 2001 I was a small business owner (consumer product development consultancy) and also attempting a second small business building these and offering the frames as kits...

mol by andbike, on Flickr

At the time I owned my dream bike, an RZ500. Unfortunately 2001 was not a good economic year, especially here in the SF bay area. I reluctantly had to put the RZ500 up for sale. A buyer drove up from Southern California and purchased the RZ.

About a week later I get a call from him asking if I could build a hybrid using the RZ500 and an R6 or R1 chassis? He'd seen the race bikes while at my office and figured I had the skill for the undertaking. After a few discussions and trips to the Yamaha dealer to look at R6 chassis, we decided on a new frame based on my race bikes (which by now were proving to be highly successful on the track). I wrote up a proposal and a few days later received a very large deposit check. Around the same time a friend offered to sell me his RZ500 which I purchased (now having some cash available).

A few months into the project I asked for another payment to keep the project moving. By now a combination of the bad economy and health issues caught up with the customer and he wasn't able to make the payment. So the project stopped. In our agreement I waved any fees for design effort in exchange I would be free to build duplicates of the frame, so of course built a few duplicates so I could have one.

The customer kept in contact with me for approximately 15 more years. Always the same story, he still wanted to finish the project, but still on hard times. Eventually I shipped some suspension and exhaust parts to him and we called it even. He declined to take the nearly completed frame which I would have sent to him if he could have made a very small final payment to bring the tally sheet even. He declined and I kept the frame.

Since then, I've had Brian Turfrey build two sets of expansion chambers specific to the chassis. I've also experimented with using Aprilia swingarms. The engine in the photo is out of my second RZ500 and that's how the project has sat for the past 20 years. I have a few other projects to finish, then I hope to return to this one. Time will tell.

By the way, the duplicate frames are available should anyone want one:party

Here's how it looks like from the other side...

DSCN9840 by andbike, on Flickr
 
I approve of you threadjacking your own thread.
Good history, perspective and insight, Julian. :thumbup
 
Great story. Sad ending, except for you being able to build one for yourself.
I know a couple RZ500 guys, so I will pass the word along about the chassis.
 
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