OzVMX Forum
Marque Remarks => CZ => Topic started by: Husabergpete on September 16, 2012, 07:33:46 pm
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Guy's,
We're starting to rebuild the 73 250 and are looking for a stronger swingarm then the original 73 ones..
Just wondering if anyone has a spare swingarm they would part with or if there is any other options available. Not too keen on the box section arms on CR high performance and dont think a thor type one would suit it but any other mods or options would be great to know of. :)
thanks Carl.
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Pete
Check out GMC listing does a strong c/moly arm for the black frame models and made in Australia
Cheers
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Ta VMX60
Yes I've seen them listed but cant find any photos of the swingarm. Anyway I will try and find out about them.
carl.
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Pete,I have had a GMC swingarm since the beginning of this year and would thoroughly recommend this product.A friend of mine who is a much better rider than me took it out at Conn Classic and said the rear end was bloody fantastic (wasn't too happy about the front end which has tired old springs).Given that 74 swingarms are hard to find and can be quite expensive(i looked for over a year and found only one which I missed out on)I went this way and am glad I did.Keep your dollars in Oz and Mr Morris in beers and pies ;)
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Shortshifter,
Thanks for the heads up on the swingarms. I bought this bike so my 18yo son could do his own full resto - his way. Only thing is I have to fund it. So far so good. I will give them a call today. Web shows the GMC swingarm is over $600 AUD. That might be stetching the CZ budget a bit at the front end....
Pete and Carl
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This 74 swingarm just ended a couple days ago without selling,may still be available
http://www.ebay.com/itm/1974-1976-CZ-Red-Frame-Swingarm-/261094494255?fits=Make:CZ&pt=Motorcycles_Parts_Accessories&vxp=mtr&hash=item3cca71d02f&nma=true&si=0LeI1RKOBOzkkZfK%2BBKW1BFR%2F%2FI%3D&orig_cvip=true&rt=nc&_trksid=p2047675.l2557
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Pete and Carl,you probably already know but whichever way you go you will need a longer axle to suit as the later swingarms are wider.Great to hear about another CZ being built.
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shorty,
No we didn't know about the axle width so thanks so much for the heads up. The CZ is coming apart as I type. Carl is bagging and tagging it now. Plenty to do albeit basically 100% complete and original. But age does just take its toll.
Will keep you posted
Pete and Carl
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The longer rear axle has a reputation of being easier to bend due to being not as supported, the amount of axle taken up inside the swingarm is quite a bit more
The spacer tube has to be shortened to fit inside the swingarm & the torque arm for the brake is different as well
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I haven't heard of that problem so far but its something ill be aware of, I might be able to manufacture something to make it all work but that's good to know anyway. I guess there would be problems with either swingarm's and set ups..
Carl.
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Shortshifter if you could possibly post a photo or two of the gmc swingarm that would be greatly appreciated just so we can get an idea of what they look like.
Carl
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The reputation for bent axles is from america, looks like they run on permanent tracks most of the time
The 73 & earlier swingarm is meant to be a bit more flexible, a combination of the curved cross brace & squashed tube for the axle mounts but not being fast enough to feel it or having used the later setup on my bike I can't really comment either way.
May have to take up the offer of a loaner 74 arm at some stage just to see if I do notice any difference
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Okay I can see the 73 swingarm would be a bit more flexable compared to the later model one but I'm not totally sure the axles would be bending unless the Americans are racing supercross.. It's all good to know hear boys.
On the other end of the bike, would anyone happen to know if it's possible to buy the magnesium to triple clamp like the works bikes had in the day? like in the link below:
http://www.vintageworksbikes.com/1974CZSpecialCont.html
carl
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Billet triple clamps are easily gotten from CR & CZstuff but the only place that may be able to supply the magnesium top clamps would be Jiri Starec, won't be cheap if you can find one though
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Yeah I've seen them on CR look trick, I might try and contact Jiri and see what he says. Knowing what they are they're not going to be cheap. thanks Tony
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Ha, I could do with staying away from pies & beer.
I’ve been thinking about hanging around with Tatey so I can lose a few Kilo’s with the tried and trusted ‘sickness diet’
You won’t normally notice my arms on a Zed as once they are painted they blend in like a normal arm.
The main difference between the 73 to 74 arms is the width of the axle slot. The 73 and earlier arms are 8mm wide each side whereas the 74 7 later are around 37mm wide.
So yes you will need a longer axle
I can’t see any reason why the axles would bend in the 74’s any more than the 73’s. They are all supported the same, the axle is only longer to go through the wider axle slot each side.
If guys are hammering there bikes to bend an axle in a 74 then the 73 axle would have bent too.
My arms are based on the aftermarket CMS arm.
No doubt a secondhand arm is going to be cheaper than one of mine but mine are built from heat treated 4130 aircraft grade Cro-Mo tubing and come with needle rollers, sleeves, seals and snail cams.
The axle is extra.
(http://i15.photobucket.com/albums/a393/gmcloa/Frames%20-%20swingarms/74-CZ-swingarm.jpg)
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What are the axles worth Geoff, the 74 arm I've been offered to use doesn't come with 1 because the bike it's out of now sports a Falta frame & everything but the frame & swingarm were swapped across
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Geoff that set up looks pretty good. I suppose these swingarms fit straight into the 73 frame without any hastle? The swingarm axle is the same as the original as well I suppose? Also what is the rear axle made from aswell?
Ta Carl
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Carl,that is exactly the setup I have on my bike and it is a 73 frame,originally a 984 125 frame but all the same.I also purchased the axle bolt as well from Geoff.I just clear coated mine because I like that raw look.If you still want pics of how it looks on the bike send me your email and I'll get some to you.Paul
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My axles I sell for $110.00
They are just machined from CS 1020 which I beleive is strong enough.
Haven't heard about any CZ axle bending problems before, I wonder which ones are bending as there are some hollow Cro-Mo axles around but I had been avoiding going down the hollow tube path.
Also they are the same length as the 74 & later axles.
To the best of my knowlegde the swingarm fitment is all the same between the Zeds
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Okay shortshifter I should be fine with the photo Geoff put up, I just wondered if they looked like a standard one or not which they do. Thanks a lot though mate!
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Good to know they fit in right away geoff ill have a talk to dad about the swingarm and everything and let you know.
I still wouldn't mind a second hand original one if anyone would sell it, I guess we can't all have what we want though can we.. Ill keep on the look out anyway.
Carl
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Pete I have a set of Billet triple clamps from CR, that has only had 2 race meets !!! had to take them of as I could race the Australian champs this year with them on as the bike would have not compliant with them on. going cheep.
Henry
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Henry, Will PM you on those ones too.
Many thanks
Pete and Carl