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Well the calipers and wheels look real enough....
 

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Your profile tells us nothing about you. Anyhow, those bikes have a whole lot of great potential...what are your plans?
 
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Well the calipers and wheels look real enough....
Calipers, wheels, shocks, swingarm, frame, etc....basically the only thing suzuki on that black bike are the engine cases and the heads. Forks look like marzocchi road race units (I think the caliper mounts are disproportionate to be ceriani and the yokes are too wide, but it could be a trick of the picture).

What I meant by "real" was whether it was built in Dan Hanebrink's shop or not back when he was operating as "monotrack engineering". It has all the goodies, and those wheels aren't really off the shelf units. Still, if it is a monotrack it's missing the signature monotrack bodywork.
 

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I'm lazy and didn't google.

whats a monotrack?
 

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Dan Hanebrink woke up one day, and was more Eric Buell than Eric Buell would ever be, but didn't quite realise it.

He built this thing in about 1971. Lets say he was a trifle creative.

hanebrink.jpg

"
In 1971 "Cycle News" publisher Chuck Clayton asked Costa Mesa, California engineer Dan Hanebrink to sketch a futuristic machine of the eighties for a front page Christmas issue of the newspaper. From this sketch Hanebrink developed his ideas and the result, two years later, was the Monotrack Experimental. This design accounted for a large number of firsts in motorcycle engineering. The monocoque chassis was made from magnesium plate and a three-cylinder, rubber-mounted, two-stroke Kohler snowmobile engine provided power to the belt-driven torque converter. Drive to the rear wheel was also by belt. Hanebrink produced the 16-inch cast magnesium wheels on which Goodyear racing tires were mounted. The suspension had no springs, but relied on air and oil damping. The circular component on the fork bottom and rear strut contains a central neoprene diaphragm, which separates the oil and air. In use, the oil in the suspension struts compresses the air under load, allowing 41/2 inches of travel in the front forks and 4 inches in the rear. "

He gave up on reinventing the wheel, and about everything else. He sold his own brand of mag wheels and superlight plasma brake discs, and other trick parts to racers for a while.

Danger, is my business.
 

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I'm lazy and didn't google.

whats a monotrack?
You know the bodywork I have on Goldstein's old H1? That is monotrack. I even have molds for the seat but I don't know if they are Dan's original ones or if they are ones David made once he had the bodywork so he could make replacements.

Witworth covered what's out there on the web, basically Hanebrink ran a company called Monotrack Engineering in the 1970's. I don't know how successful he was but he sold racing parts, mostly for old two strokes like brake setups, wheels, etc... He also build a few road bikes based on RD350s and early H1s (1969-1972) and a few race bikes for customers. Hanebrink is a former NASA engineer and he had some talented people that worked for him like Kent "Rocky" Rockwell who was well known for being the go to fabricator for WWII aircraft restorations.

Here is Rocky on his shark mouthed monotrack yamaha:


Dan is still around and doing cool stuff, he sells these quirky electric bicycles and "go anywhere" bicycles now:
Home

Monotrack bodywork is common enough, in fact airtech still sells the tank and seats Dan used to make, but some of the other stuff like brake calipers, wheels, etc are really rare because they were race stuff so they were never sold in high volume. I've never seen a set of his wheels on a bike that wasn't worked on by his shop , not that I have seen many of these sets of wheels in general (I've only seen one set in person).

 

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Frame: modified stock frame
Forks: Ceriani 35mm roadrace but the triples look wider than normal.
caliper: ?
Disks: ?
Pipes: Ocelot
Wheels: Probably Montrack
Tank: Dicks Cycle West or something similar
Rear M/C: Hurst ?
Front M/C: Suzuki
 

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Frame: modified stock frame
Forks: Ceriani 35mm roadrace but the triples look wider than normal.
caliper: ?
Disks: ?
Pipes: Ocelot
Wheels: Probably Montrack
Tank: Dicks Cycle West or something similar
Rear M/C: Hurst ?
Front M/C: Suzuki
Are you sure about them being ceriani? the caliper mounts look too big/wrong shape. I've seen similar ones on the 32mm ceriani road race forks though.

I don't think monotrack made their own frames, they usually modded existing stock ones.

either way it's certainly someone's 70's period race bike.

caliper and dics are monotrack as they say monotrack on the caliper. Everybody used those hurst master cylinders, have a box of them from my dad's karting days in the early 60's.

Don't forget the bars being magura also
 

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I thought I was still writing that. I must have posted it half way through.

Frame: modified stock frame or is it? The steering head is different and so are the shock mounts and swingarm pivot, so no. It's a custom or monotrack frame
Forks: Ceriani 35mm roadrace but the triples look wider than normal. And the fender mounts look almost tear drop shaped
calipers: Monotrack
Disks: ?
Motor: stock with stock carbs - might be ported
Pipes: Ocelot
Wheels: Probably Montrack
Tank: Dicks Cycle West or something similar perhaps. Maybe made by/for Monotrack, but not their usual style/shape.
Seat looks almost like a modifed Laverda SFC or race Jota
Rear M/C: Hurst ?
Swingarm is interesting. How is the chain adjusted?
Front M/C: Suzuki street bike?

Very interesting bike
 

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i remember one of the "lesser known" mags doing a write up on a H1( i think) back in the early-mid 70"s. the bike in the opening clip...
.. it looks like a triple , what, i have no idea. the last pic is a kaw triple
Dirk - that's the tank that I have. Same color too minus the white stripe across the top.
 

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talk to me brother, the 400 needs some spicing up
Not sure if it's any good. You'll have to take a look at it and decide.

On the frame - that headstock does not look like a stock T500 head tube. From what I can see on the zoomed in pictures, it's missing the bearing flanges on the top & bottom. Also the frame numbers don't look like the usual stamped VIN, down tubes look thinner than stock, and the welds don't seem sloppy enough for factory.
 

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I thought it was a modded stock frame because of the vin, but you are right that is a real one off. Can anyone make out the vin?

Also, where is our OP? Hey Piston Pete how about you come back and tell us a story as to how you managed to acquire pukka 70's race bike awesomeness?
 

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does it leak ? i can take a ride out w/ cash.
I honestly don't know if it leaks. Bought it many years ago off ebay (before the widespread use of 10% ethanol gas) and it's been sitting on a T350 frame in my office since. Keep in mind if you are bringing a bunch of Geeto's stuff to my house, I may have to charge you extra!
 

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Discussion Starter #17
Hi Guys
Im Pete from Oceanside, Ca.
Im excited to have found this blog and getting all of your feed back!
I acquired these bike through craigslist a few months ago. I got them from the step son of a guy who died who had them in a storage unit for 12 years or so. Supposedly the 1976 GT500 was to be the donor for the black bike that I haven't been able to Identify other than the gt500 motor in the frame. I got another gt500 engine that has compression that Im planning to install because I found this black bike with the semi disassembled semi fabricated with the gt500 engine in it.

I have had an RD400 in the past and a bunch of 2 stroke dirt bike so when I saw these I thought Id better jump on them.

I would really Appreciate any and all advice and information on these
thanks in advance!
 

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Discussion Starter #18
Im Planning to just get gt500 road worthy and go from there, as for the black bike im still trying to research and see what to do?
any suggestion?
 

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Discussion Starter #19
Hi
How do I determine if it is?
I got it from someone who had no information on it other than his step dad had them and died ago.
 

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Hi
How do I determine if it is?
I got it from someone who had no information on it other than his step dad had them and died ago.
Hey Pete,

Could you post more pictures of the head stock on the black bike? Curious if this is a modified stock T500 or something else entirely. If it's a stock T500 head tube, the VIN will be T500-XXXXX for bikes built between 1968-1975. The GT500 had six digits after the T500- bit. If it is a custom Monotrack frame and was raced, you might be able to track it's history from the builder himself Dan Hanebrink. Geeto posted a link to his website. Usually the low volume builders remember their progeny.

Home

If the black bike has a race history you should think about restoring it to it's original competition state and give vintage racing a try.

FYI - the GT500 was an upgrade to the T500. Sold here in 1976 & 77. Upgrades included a PEI electronic ignition, 35mm forks, and a disc brake.

I have a scan of the factory service manual here:

http://file.walagata.com/w/sundialmotos ... kiT500.pdf

and it includes service data for the GT500 PEI.

Jim
 
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