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Old 28-01-06, 08:58 PM   #1
svrash
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Default which GSXR for forks

I want to buy either an insurance write off or stolen recovered and sell the good (and bad) bits, keeping the front end for my curvy and recouping some (if not all) the costs (including my current front end)

Would prefer a USD fork model







But ain't got a clue which model/year gixer I'm looking for so the front end would fit my curvy with the minimal of fuss


Please advise
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Old 29-01-06, 01:27 AM   #2
northwind
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(deep breath) IMO, the ideal setup for the curvy is SRAD 750 yokes. They fit perfect, have hte same steering lock stops, look identical to standard, and even the parking lock works (though some people, me included, have to take a mm or so off hte ignition bolt or out of the frame). You either need to get a custom bearing- I'd use Twin Works Factory in the states, $60 US gets you a nice roller bearing- or swap the stems (needs hardware, probably a shop job)

Then, you can basically put in whatever 50mm forks you want. I used 2002 750 forks, mudguard and calipers, but they're really much the same as SRAD ones- just newer, and without the massive mudguard and sticky brakes.

Then, you need a wheel that'll fit, an axle to carry it, and a set of discs the right size. If you've used either SRAD or Y-K2 forks, the SRAD wheel and axle fit perfectly, as do any recent 320mm GSXR discs (you need small spacers, ie M8 washers on the calipers, if you use Y-K2 forks) I think teh same is true for K1-K2 thou forks, though they're less good.

So the easiest way is to get a whole SRAD front end and just use it. A wee bit harder, but still dead easy, is to use a Y-K2 set of forks, muddy and caliper. Harder would be using more recent forks with radial calipers, you're on your own there as far as spacing the discs.

The forks I've mentioned are about 15mm shorter than standard so it's wise to fit a 120/70 tyre, that brings the height nearly all the way back up.

The clipons will be very low, you'll probably have some clearance issues, so either figure on raising them, getting Sun Risers or similiar, or finding a set of TL1000S (not R) clipons, as these are higher. Also, the SV master cylinder will work with either of the 4-pot brake calipers, but only just- this was the same with the GSXRs in fact. Well worth planning to upgrade it to make the most of your other parts- no point in lashing out on the front end and cutting corners on the brakes.

And that's it! if you're careful, you should be able to find a SRAD/TL/Busa (all the same) wheel that's the same colour as your SV rear.
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Old 29-01-06, 02:35 PM   #3
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Ive just fitted 600K5 front end, all I used was a 48/30/15 bearing which I got ground to 47mm od.
Lock stops are no where near, nor the steering lock.
But disc spacing is ok for TL/Srad front wheel, just need 300mm discs or spacers for 320's and the spinle needs a lick off both sides to get wheel central :P
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Old 29-01-06, 02:58 PM   #4
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Ah hah, a brain to pick How wide are the K5 yokes, centre to centre? IIRC they're 50mm at the top too? And with those yokes, how much did you have to space the discs out?

Interesting stuff...
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Old 29-01-06, 06:54 PM   #5
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Default Re: which GSXR for forks

Quote:
Originally Posted by svrash
I want to buy either an insurance write off or stolen recovered and sell the good (and bad) bits, keeping the front end for my curvy and recouping some (if not all) the costs (including my current front end)

Would prefer a USD fork model







But ain't got a clue which model/year gixer I'm looking for so the front end would fit my curvy with the minimal of fuss


Please advise
Northwind has covered more or less your options. As he said easiest way is just get a complete SRAD front end and then sell yours once done.

Apparently not much difference betwee the SRAD and the K series forks but I would go for newer myself. This would mean no ignition lock and having to modify lock stops on bottom yoke or using a 'L' shaped bracket mounted to headstock were front subframe is bolted on to. Em.. so easiest would be SRAD.

I've used all combinations going ending up with GSXR 1000 K1-K2 bottom yoke(lock stops moved ) and custom top yoke but ... just changed to back to the OE GSXR top yoke so I can use clip ons(Helibars). My custom yoke was a bit too thick for clipones. I intend to have another one made at some point. Robw#70 bearing mod also sounds good.

Robw#70 are the wheels from the K1-K3 GSXR600 interchangeable with the K4-K5 because if they are , you should be able to use the spindle/nut as is. Center the wheel and with the nut in there should be about 3mm IIRC poking out of the side of forks. Do up pinch bolts and then insert your spindle as normal. No need to take off any metal fron the nut or spindle. I've also got some spacers and longer stainless steel bolts for the discs if you are interested. The bolts are nothing special so might not be bling enough for you .
I'm sure you can get some longer blinger ones ones from pro bolt or similar . You can have the bolts/spacers for £11 icluding postage. I was going to use them on my front end swap for my other bike but found a set of GSXR1000K3 wheels/discs at a great price.

Cheers
Ben



ps: Svrash if you decide to go for the SRAD stuff let us know what you are unable to source. Got some stuff kicking about.
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Old 29-01-06, 07:01 PM   #6
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Quote:
Originally Posted by northwind
Ah hah, a brain to pick How wide are the K5 yokes, centre to centre? IIRC they're 50mm at the top too? And with those yokes, how much did you have to space the discs out?

Interesting stuff...
Off the top of my head I would say 207mm cetre to centre. The spacers are actually for the calipers (between caliper mount and caliper).

I think I know what you are thinking .

Cheers
Ben
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Old 29-01-06, 07:38 PM   #7
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Yep, I might be thinking that But then, maybe not.

The spacers I was referring to were to get the discs out to the calipers, since you can't space radials in like you can with the traditional Tokicos... If I did do it this way, I'd use 300mm discs- less weight, and closer in, and 320mm on the radials would be taking the mick a bit for an SV

I'm changing discs anyway, I'm a bit sick of the rusty prolites. They work fantastic, but they just look grubby with the winter riding. (Yes, I know you told me this back when I got them, yes, you were right, but on the other hand the wheel, discs and axle were £125 posted Should be able to sell the discs for a tidy sum once they're cleaned up.

While I'm on the subject of rusty Prolites, I got a Prolite Contour for the rear. The whole thing's bare metal, it doesn't have the painted inner like the SV, so 2 weeks of winter commuting and the whole thing's turned brown. Deeply unimpressed. It's one thing with front discs, since most of the iron is friction surface and gets cleaned, but EBC claim there's a corrosion resistant coat on the centres of these ones. Good disc other than that...
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Old 29-01-06, 07:57 PM   #8
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Quote:
Originally Posted by northwind
Yep, I might be thinking that But then, maybe not.

The spacers I was referring to were to get the discs out to the calipers, since you can't space radials in like you can with the traditional Tokicos... If I did do it this way, I'd use 300mm discs- less weight, and closer in, and 320mm on the radials would be taking the mick a bit for an SV
Only 2mm(1mm) either side so don't even reckon you'll even need discs spacers . The only other think I can think off would be discs thickness but even that would be.. at most 0.5mm ?.

EDIT: Wrote the above and then just rremembered you are using SRAD yokes. Don't think it would work. SRAD yokes have centre to centre distance of 214mm. That would mean the discs would need pulling in(machining of disc mounting surface on wheel)


Cheers
Ben
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Old 29-01-06, 09:44 PM   #9
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Cheers guys

Ok then i'm gong to go for the SRAD stuff cause i want to do most of it myself

What do i need (presisely please )

Rough costing for buying SRAD stuff and selling the SV's bits

Pleas please please answer this one as i'm trying to convince the wife the SV's front end is worth changing
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Old 29-01-06, 10:43 PM   #10
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I needed 3.5mm off the spindle and nut, but it is with a dymag wheel so prob wasn't too clever a fit to start with.

Disc wise K3 sv discs are the same as 300mm GSXR600/750/1000 >K4 apart from the thickness(5mm on Gsxr) which is not really a problem as it wont generate the same sort of heat as a 150+ mph bike

I was actually looking at doing a batch of bearings, but it is quite expensive, so would need to do at least 5 which would make them £30-35 each, They're actually 13mm high instaed of 15, but when I fitted the front everything cleared so I didnt bother spacing the 2mm, but you may need to with other yokes
You've also got to be careful putting it in as its a bit thin on the top edge, also worth filing the frame underneath so you've got some chance of getting it out to replace it in the future

All spindles are the same btw, Srad,Busa,TL and K series gsxr
And 600/750 yokes are a better offset than 1000
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