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1977 KZ1000 Restomod
- Mikaw
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Skidmark wrote: It's the slow periods that start to get under my skin with mine. For the first time since I started on mine it is under a cover. Looking like April at the soonest before I can get back to it. Keep up the progress, I really like where you are going with this bike!
I completely understand. Days go by waiting on a delivery. That will finally arrive and only to realize that what you wanted to do is somehow related to another item that’s out for Plating or I just forgot to order, or hasn’t been detailed yet. The choices are mock it up only to take it back apart later, or wait. The best is to be patient and just wait. The more you “mock” up the better chances are you can scratch or damage something.
1976 KZ 900 A4 kzrider.com/forum/11-projects/613548-1976-kz-900-a4
1976 KZ 900 B1 LTD
1978 KZ 1000 B2 LTD
1980 KZ 750 E1
Kowledge Speaks, But Wisdom Listens.
Jimi Hendrix.
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- calum
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The modified GSX-R swingarm and Öhlins shocks arrived yesterday. I'll be chopping a few things off the frame tomorrow so I can get the swingarm mounted (brake pedal bracket needs to go). Once that's done I can get the ZRX forks back in and check the height of the front and back axles. If I'm lucky the bike will be level at the middle of the height adjustment range on the shocks.
Current Project:
www.kzrider.com/forum/11-projects/616901...-spare-parts-project
1977 KZ1000 Restomod ( www.kzrider.com/forum/11-projects/614517-1977-kz1000-restomod )
1980 KZ750H ( kzrider.com/forum/11-projects/612054-kz750h-restoration )
2000 BMW F650GS
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- DOHC
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- Those Doe-Hawks really go!
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'78 Z1-R in blue , '78 Z1-R in black, '78 Z1-R in pieces
My dad's '74 Z1
'00 ZRX1100
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- calum
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I will take a couple of photos tomorrow when I'm back in the garage. All I can add at the moment is that they each had two springs - a smaller, tightly wound one at the bottom.
Current Project:
www.kzrider.com/forum/11-projects/616901...-spare-parts-project
1977 KZ1000 Restomod ( www.kzrider.com/forum/11-projects/614517-1977-kz1000-restomod )
1980 KZ750H ( kzrider.com/forum/11-projects/612054-kz750h-restoration )
2000 BMW F650GS
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- calum
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One of the seat hinges had already been removed - someone was pretty heavy handed with the grinder.
Got the GSX-R swingarm and the forks on.
Checked the axle height against the stock setup. Ground clearance was 130mm/145mm (front/rear) on the stock setup, putting the frame pretty much level when the wheels are on. New clearance is 145mm/80mm. This reduces rake a bit (the two photos below show the difference between stock rake and the new rake (I propped up the swingarm until both axles were at the same height). I can drop the forks down about another 10-20mm, but the major difference is the swingarm and shock length (both are a bit longer than stock). I can shorten the shocks by about 8mm but there isn't much else I can do at the back short of moving the shock mounts.
I realise that the rake will change due to tire profile and sag, the idea here was to get a comparison to the stock setup, not to actually figure out the exact numbers.
I would appreciate some opinions on how this will ride. Do I need to mess around with things, or do I just see how it goes and get a stepped top yoke if it doesn't feel right?
EDIT: Just did some maths and the rake will be reduced by about 3°, so should be about 23°.
Current Project:
www.kzrider.com/forum/11-projects/616901...-spare-parts-project
1977 KZ1000 Restomod ( www.kzrider.com/forum/11-projects/614517-1977-kz1000-restomod )
1980 KZ750H ( kzrider.com/forum/11-projects/612054-kz750h-restoration )
2000 BMW F650GS
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- DoctoRot
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- Oh, the usual... I bowl, I drive around...
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FWIW I have ZRX1200 forks on my KZ1000B and to get the numbers I wanted I ended up with about a 1.25" drop triple 38mm offset- with 18" wheels. This left me with 25 degrees and 107mm trail. I wanted to get as close to the ZRX numbers as possible as the valving was designed for that geometry.
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- Scirocco
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- Never change a running system
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My 1975 Z 1 B 900 Project
www.kzrider.com/forum/11-projects/605133...ears-deep-sleep-mode
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- DOHC
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- Those Doe-Hawks really go!
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kzrider.com/forum/25-racing/614983-81-gpz1100-road-racer
kzrider.com/forum/11-projects/586776-bet...ike?start=336#780625
Of course as DoctoRot said, what really matters is the resting position with the suspension loaded. Do you know the spring rate and preload for the Ohlins shocks? The FSM has a graph of position vs load and preload for the stock shocks. That would allow you to approximate length-under-load for the new and old shocks.
Another thing that factors into the trail calculation is the offset in the triple clamps. Do you know if the new triple clamps have a similar offset to the original set?
'78 Z1-R in blue , '78 Z1-R in black, '78 Z1-R in pieces
My dad's '74 Z1
'00 ZRX1100
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- DoctoRot
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- Oh, the usual... I bowl, I drive around...
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- DOHC
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- Those Doe-Hawks really go!
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I think I asked this before, but I forgot the answer. Is that 11-13 deg. target for the resting position under load?what IS important is the swingarm angle. sweet spot is 11-13 degrees. this angle will have a lot of effect on anti-squat.
'78 Z1-R in blue , '78 Z1-R in black, '78 Z1-R in pieces
My dad's '74 Z1
'00 ZRX1100
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- DoctoRot
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- Oh, the usual... I bowl, I drive around...
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- calum
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If I still need to bring the front up a bit I can get the bottom of the top yoke milled out. Can probably get about 20mm doing that. After that it's time to get a new top yoke made... hoping to avoid that (but it would be my own fault for skipping a step in the planning).
Here's some more info:
- Shock length: 365mm +8/-2 (thought it was +2/-8... oh well)
- Offset is a lot smaller than stock. Around 40mm +/- (going off pictures, can't find my notes...).
Current Project:
www.kzrider.com/forum/11-projects/616901...-spare-parts-project
1977 KZ1000 Restomod ( www.kzrider.com/forum/11-projects/614517-1977-kz1000-restomod )
1980 KZ750H ( kzrider.com/forum/11-projects/612054-kz750h-restoration )
2000 BMW F650GS
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