Topic: monoshock 750

[bwaller]

This is a period mono shock that raced in Canada in the 70's.  This one has a 550, there was at least one built with a 750 that was raced.  It uses a TZ style arrangement with the shock laying horizontal over the engine.  Helps keep the wheel base very compact.


A 'continuation' frame / swingarm by the original builder (around my 78 550), is planned to start this fall.

Is this Dennis Curtis work?

[sander]

Nice bike! I love that tank.

dont look like oem pistons

I don't know the history of these brakes, so maybe they have been rebuild before. I doubt it though...

[Tintop]

This is a period mono shock that raced in Canada in the 70's.  This one has a 550, there was at least one built with a 750 that was raced.  It uses a TZ style arrangement with the shock laying horizontal over the engine.  Helps keep the wheel base very compact.


A 'continuation' frame / swingarm by the original builder (around my 78 550), is planned to start this fall.

Is this Dennis Curtis work?

Yes, one of Denis' from his west coast period.  It was Robby Micklejohn who raced the 750 version.  According to him, it had lots of 'back door' factory bits, like a CR alloy oil tank.  The 550 raced into the 80's down east (NS).  According to what I was told, it's steering neck broke in a crash, and the frame was discarded.

[Tintop]

Nice bike! I love that tank.

dont look like oem pistons

I don't know the history of these brakes, so maybe they have been rebuild before. I doubt it though...

Really like the work you have done with your 750.  As for the tank, have not been able to find out what was used, but it would have been 'off the shelf'.  I think it might be a Bultaco TSS race tank.

[sander]

Yesterday i have mounted the cafe seat and mounted the taillight to it. The tail light came with a little fender. Because it's small it doesn't disturb the contour off the cafeseat but still gives me the possibility to mount the licenceplate in a legal way. This bike is going to be a daily driver so i want it to be legal.

I also mounted the exhaust headers and luckily they cleared the rearsets. Just barely! I forgot to check when i welded on the rearsets...

The offset sprocket is on it's way! I just got an email they shipped it yesterday. A few posts back i said i ordered a 9mm offset but it's 14mm instead.









Sander

[traveler]

I wonder how this would look on my 550 bike.

~Joe

[MCRider]

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[void909]

bad ass man

[jaguar]

im really thinking about doing something like this as my next build.
i have a 78F frame just sitting

[Retro Rocket]

The offset sprocket is on it's way! I just got an email they shipped it yesterday. A few posts back i said i ordered a 9mm offset but it's 14mm instead.

All the ones i have seen are 10mm offset, where did you get the sprocket ?

Mick

[sander]

I had one custom made by Kruger & Junginger in Germany. They can make any sprocket for the 750. The only other option i found was the cyclex one. But that's for 530 chain and i need a 520 to clear both frame and tire with ease.

[Retro Rocket]

I had one custom made by Kruger & Junginger in Germany. They can make any sprocket for the 750. The only other option i found was the cyclex one. But that's for 530 chain and i need a 520 to clear the clear both frame and tire with ease.

Thanks for the reply. I have a sprocket maker near me so i will go have a chat with him as i would like to run a 520 as well. Does anyone know what chain size the late 1980 early 1990's Gsxr's used.....

Mick

[traveler]

Front sprocket....what would happen if you took two front sprockets, milled the teeth off one and welded them together?  Then the front sprocket would be "pushed out"

Granted, the sprocket cover would go bye-bye, but I have seen this done on rigid CB's.

Earlier, I told you the swingarm looked too big for the frame....well, with the engine in there, it looks fine to me now.

Glad to see the stock tank is staying.....it just looks right to my eye.

Anyway, just my .02

~Joe

[Retro Rocket]

Front sprocket....what would happen if you took two front sprockets, milled the teeth off one and welded them together?  Then the front sprocket would be "pushed out"

Granted, the sprocket cover would go bye-bye, but I have seen this done on rigid CB's.

Earlier, I told you the swingarm looked too big for the frame....well, with the engine in there, it looks fine to me now.

Glad to see the stock tank is staying.....it just looks right to my eye.

Anyway, just my .02

~Joe

Hi Joe, yeah, i thought of the 2 sprocket thing or even, Cycle X has dual chain and sprockets, you could machine down one side of the dual sprocket and achieve the same thing. I think a custom made one, or 2, would be better because i can fit as wide a tire as i need then get the sprocket made up to suit.

Mick

[sander]

Welding two sprockets together was my backup plan. But welding those two thick pieces of metal would need a lot of heat and warping could be a problem. Maybe you can weld two 530 sprockets together and turn them down afterwards to 520 to make them true again.
Just a thought...

Front sprocket....what would happen if you took two front sprockets, milled the teeth off one and welded them together?  Then the front sprocket would be "pushed out"

Granted, the sprocket cover would go bye-bye, but I have seen this done on rigid CB's.

Earlier, I told you the swingarm looked too big for the frame....well, with the engine in there, it looks fine to me now.

Glad to see the stock tank is staying.....it just looks right to my eye.

Anyway, just my .02

~Joe

Looks allright, doesn't it? Can you believe someone painted that tank flat black? They didn'd do a very good job so i could just chip it off.

Sander

[traveler]

The reason I think the welded sprocket idea would be good, is that you are getting a real solid mount on the shaft, and the inside sprocket can be milled down as necessary to get the exact spacing so that the chain is running straight and true.

I guess i just can't see any warpage....have the teeth milled off, and then get a spare shaft to keep the sprockets aligned and then Arc/stick weld the pieces together.....then check measurements and mill off the inside face to get it where it needs to be.  Just have to ensure the Arc weld is STRONG.

Seems to me that it would work fine....but....I have been wrong before.

[sander]

The sprocket has arrived!!





Renthal chain and aluminum rear sprocket are ordered. Today i wired up the dyna s ignition and a new solid state reg/rect. All i have left to do is mount the brakes and oil tank.



Can't wait to ride it!!

Sander

[jaguar]

what did the sprocket run you?

[sander]

85 euros. That goes for all front sprockets without additional bearing.

[wannabridin]

where's your seat cowl from?  AWESOME looking build, i'm digging the lines!

[greasy j]

cool.

nice work!

[sander]

Thanks!

where's your seat cowl from?  AWESOME looking build, i'm digging the lines!

I got the seat from a Dutch equivalent of craigslist. It's nice and small but i don't know anything about it. By the look of it i would guess it's homemade.

[sander]

Yesterday it was time to keep the fingers crossed and see if the stock oiltank would still fit.... It does easily!



After seeing this picture again. I think it will look better with the headlight lowered a bit. I will try it today.



Sander

[HedNut]

That thing looks SWEET!  can't wait to hear about you riding it!
Cheers

[sander]

I'm almost there!!

Yesterday i replaced the fork seals, they were leaking all over the place. One fork leg was actually almost empty.
I lowered the headlight and removed the tach. I think it looks a lot better this way. I'm looking for a small tach to fit into the headlight. It will probably be one of those car tuning gauges. As they are cheap and small (only 52mm), not watertight but some sealant will take care of that.

I modified the brakes to fit and mounted the brake lines. That's about it... Oh and i still need to make a longer sidestand.
Still waiting for the rear sprocket and chain to arrive.

Some pic's







Sander