hey just got some zxr400 inverted firks for my bike. just wondering if anyone on the forum has done the conversion. what would be the easyest way to do it coz i want to use stock nisin brakes. _________________ 94 mc28 SE
nigel has done this conversion, quite alot of work by all accounts but looks very nice. _________________ MC21SP - Roth-tax
CBR400 - track
MC21R - sold
MC21SP - sold
fstnsr wrote:
just wondering if i can keen the stock clamps coz the ofset may be differant
No chance. That's the point of the USD forks... the larger diameter of the legs is supposed to make them stiffer. The ZXR400 USDs will probably be around 46mm OD whereas the MC21 RWU forks are 41mm.
If it were that simple, everyone would be doing it!
The company that did Nigel's conversion should (if they are worth their salt) still have the plans of his clamps. They would be your cheapest and easiest option in my opinion. _________________ Andy.
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sorry andy i think u miss understood. i want to keep the zxr stock clamps and was wondering if the angle on the forks was much differant between zxr and nsr. was going to get the stem pressed out of nsr clamp into zxr one. _________________ 94 mc28 SE
that is one nice bike. i really like the paint job would have cost a pretty penny. what forks does the tyge bike have if they are non honda? _________________ 94 mc28 SE
fstnsr wrote:i want to keep the zxr stock clamps and was wondering if the angle on the forks was much differant between zxr and nsr. was going to get the stem pressed out of nsr clamp into zxr one.
Yep, you had me wondering a little there! Sorry I did misunderstand the post.
I think you will need a new stem machined and have that pressed into the ZXR forks. The fork angle will remain the same as the NSR, as the angle is built into the headstock. To keep the geometry similar you will need to make sure the axle is the same distance from the triple clamps, but you can't account for Kawasaki's offset of the forks unless you use custom made triples.
Bringing the forks up or down through the clamps will alter the rake and trail, and will be able to get it close to the NSR but it's unlikely you will get it the same, you'll have to do some careful measuring. I don't think Nigel has any issues with his front suspension though. _________________ Andy.
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i think he even had the NSR stem pressed into the ZXRs, so he didnt even need to get one machined. _________________ MC21SP - Roth-tax
CBR400 - track
MC21R - sold
MC21SP - sold
A lot of people press the stem out of the NSR yokes and into the yokes they're intending to use with whatever front end they have... That is absolutely fine, IF the new yokes have an offset of 35mm...
The NSR yokes have a pretty large offset at 35mm... For instance, Harris' adjustable offset yokes only have a range of 24-34mm... The offset is the primary way that the trail is determined and even a very small change can have a large impact on increasing or decreasing the trail. The conversion I've just done with the ZX6rr forks wouldn't have been possible with their yokes. The offset was 20mm... This would have increased trail from 87mm standard to 98mm. Doesn't sound much, but it would sure slow down your sweet handling NSR.
As Andy points out, it's not quite as simple as just swapping it all over, IF you want to do it properly.
You CAN partially overcome the increased trail, by reducing your rake, (increasing rear ride height, rasing the forks trhough the top yoke), but it's a comprimise. _________________ NSR300R - Why did i ever have a 250...
Looking at the images of the Jha front end, I would say it is most likely a straight forward stem swap, although the cost would indicate a new/revised triple clamp!
I've ridden an NSR with the RVF front end and didn't like it at all.
I've found that most NSRs you get on feel similar, something "same same" about them all, but the MC21 with the RVF front... ooh, didn't like that! Maybe it was the combination of RVF front end, a 120 tyre, and the fact the tyre was a Pilot Race that I couldn't get to grips with? I don't know, but it didn't feel NSR anymore. _________________ Andy.
NSR-WORLD.COM
Please keep all responses to Forum posts on the Forum so that others may benefit.
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If you measure your offset (ooer), it is still 35mm. I don't know what the RVF offset is (perhaps fontyy can help) but the Jha yokes keep everything the same as the NSR. The RVF forks are also the same length from the top face to the centre of the wheel spindle as the NSR - 710mm. _________________ NSR300R - Why did i ever have a 250...
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