Fork Swap

Technical stuff specific to the Raptor 1000

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Trevor68
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Fork Swap

Post by Trevor68 » Thu Nov 14, 2019 9:53 am

Slowly getting the Raptor into shape, the new Wilbers rear shock has exposed how stuffed the forks are, so it is their turn now. I was just going to go for seals, new springs and a revalve, but then saw a set of GSXR 1000 K7 Forks near me for $250.

I've done a fair bit of reading of old topics, but no one ever seems to really get into specific lengths etc. Does anyone know if these are close to the same length as the raptor?

Also any guidance on which axle, spacers, calipers, rotors, master cylinder etc would be grand.

I have done a fork swap before and a friend has a lathe, really just need some guidance so I don't buy a whole bunch of parts that don't go together. :)

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Re: Fork Swap

Post by Trevor68 » Sun Nov 17, 2019 9:00 pm

Well I have started collecting bits. So far I have

K7 1K Forks
K4 1K Complete brakes with S/S lines
K10 1K Axle.

Update: Ah bugger, just realised the K8 forks are 50/56 and the Cagiva triples are 50/54 I believe, so back to fork shopping.

Might just be easier to do cartridges maybe.

https://www.ebay.com.au/itm/Andreani-fo ... 14e1bf11d8

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Re: Fork Swap

Post by Craigfell » Tue Nov 19, 2019 5:14 am

Crap Tartan wrote:
Mon Jun 24, 2013 3:46 pm
Abbot,

I fitted the R1 forks to my 05 1000 Vrap. I reckon the 650 should be the same as frames are interchangeable. Dont know what you have got!

The front mudguard wont fit without a lot of new bracketry and faffing about, just get an R1 guard (cheap as fekk!)

Same with the calipers, can be made to fit but will need to manufacture brackets, get some Yam blue spots to go with the forks, they are another upgrade on the brembo`s (better feel and stronger braking)

Your Cagiva discs will be fine whatever calipers you choose.

get a R1 spindle as its easy to modify to fit and a couple of spacers and away you go!
viewtopic.php?t=4066 <-- Link to the thread, you've probably read.

Thats the most common i have seen, but a fair few fit from what i've seen aprilia ducati gsxr depends how much you want to spend i suppose.

Also, you could use a 2mm shim on the bottom triple to save faffing about getting another set of forks.. seen that done many times.

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Re: Fork Swap

Post by Trevor68 » Tue Nov 19, 2019 10:27 am

It is the wrong way around I think, as in the bottom of the K8 forks are 2mm bigger than the triples, your right though, people have used shims the other way around.

I have picked up a set of K4 GSXR600 forks now, as they are all the same, 50/54 and 720mm long, so only 4mm shorter than mine. I am going to try and imitate boofheads setup hopefully, which should just mean spacing my rotors out 3mm for the gsxr calipers to fit, and a custom spacer on the axle to keep my wheel.

Will see how it all turns out when the bits arrive. :happyhappy:

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Re: Fork Swap

Post by shebee » Tue Nov 19, 2019 7:53 pm

Trevor68 wrote:
Tue Nov 19, 2019 10:27 am


Will see how it all turns out when the bits arrive. :happyhappy:
Good luck!
Twisted Tequila Sister

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El Vikingo Tropical
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Re: Fork Swap

Post by El Vikingo Tropical » Fri Nov 22, 2019 10:11 pm

That’s a very good forks and easy to adapt
Saludos desde Canarias

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Re: Fork Swap

Post by Trevor68 » Mon Dec 09, 2019 2:59 am

With many thanks to Boofhead for the drawings I have organised a machine shop to knock up the rotor spacers.

Now thinking about the 2x3mm spacers I will need for the axle, I have a spare GSXR Bush/Axle nut that the axle goes inside of, maybe I could just get them cut from that?

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Re: Fork Swap

Post by Boofhead » Mon Dec 09, 2019 5:27 am

No problem, just check your email as I just sent the axle drawing as well :thumbsup:

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Re: Fork Swap

Post by Trevor68 » Mon Dec 09, 2019 9:53 pm

Thanks for that, I am going to ask the place that is making the rotors to make the new axle nut and spacer as well.

My friend has a hoist and some spare time on Sunday so here's hoping the shop can get these done for the weekend and it might all come together! :dance:

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Re: Fork Swap

Post by Trevor68 » Wed Dec 11, 2019 2:23 am

Picked up the rotor spacers today, they look the biz!
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Re: Fork Swap

Post by Trevor68 » Sun Dec 15, 2019 6:30 am

Almost finished, just have to paint the guard now. has totally transformed the bike!
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Re: Fork Swap

Post by nickst4 » Sun Dec 15, 2019 9:26 am

Good work! I can't see the spacers but I guess they are a lot smaller than they appear in your previous photo and are hidden beneath the rotor carriers. A transformation in looks certainly, but we need details! :nod:

Nick

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Re: Fork Swap

Post by Trevor68 » Sun Dec 15, 2019 10:00 am

They are GSXR600 K4 forks, I think the brakes are actually K3, as the EBC catalog quite clearly shows K3 having 4 pads per caliper like mine do, and the K4 only having 2, guess I will know once the new ones arrive.

The axle was supposed to be off a 1000 K4, but is also fishy, given we had to put both 3mm spacers on the same side to center the wheel, oh well, it all went together after almost giving up trying to get the master cylinder to pump.

Must have been a heavy bloke that owned the gixxer, as after backing the springs right out the ride home was still quite firm and we barely got enough preload.

Still it feels amazing, so I'll ride it for awhile before I decide if it needs respring/valving.

Guard should arrive tomorrow, and one day I will get a longer S/S brake line made, as the gixxer one "just" reaches.

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Re: Fork Swap

Post by Trevor68 » Thu Dec 26, 2019 2:35 am

Bit closer to finished today, guard painted and bolted up, new brake lever and EBC HH pads fitted.

Just need to get some new brake lines made, and then Springs/reValved. :revrev:
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Re: Fork Swap

Post by nickst4 » Thu Dec 26, 2019 8:51 am

Looking good! :nod:

Nick

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