As the title says, can anyone assist in identifying this bottom yoke?
Image attached of the fork lowers if it helps.

The lock stops are located just forward of the centre line of the bottom yoke, I assume they would need to be on the rear edge usually.
As such they stop about 10mm short of locating with the frame when on full lock.

I saw an elegant solution in an earlier post from Paul G, of tapping the stops to apply a capscrew adjuster. I plan to borrow that idea if OK with you Paul?


Last edited by Max on Mon May 04, 2020 12:03 pm; edited 1 time in total

Hi Max I have replied to your PM but will post it on here as well for reference.

I did drill and tap the lock stop originally when I had an RVF400 front end fitted which worked okay but because the lock stops are quite narrow you can only use a small diameter bolt. This worked okay but when I dropped it on a track day the bolt bent and the forks dented the tank.

After this I used a Tyga lock stop reducer which just bolts to the lower yolk and worked better in my opinion.

They look like MC28 forks, so I expect they are possibly MC28 bottom yokes. I don't have an MC28 frame to compare with a '21 to see if the cast in stops are narrower than the MC21s though. Maybe Johnny Mac can compare a couple his bikes sometime and let you know?
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I think the lock stops are the same on from 21 to 28 but the 28 has a hole in the stem for the steering lock. maybe MC18?

the forks do look like MC28 though.

Yeah, pulling the yokes out would soon confirm that. I have MC18 and MC21 HRC frames in the cupboard... right at the back, under mountains of other stuff... but will see if I can have a measure up sometime.

MC18 may be a good shout, Paul.
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Hi there Mc 18 stem is a tidy bit longer the 21,28 and the stops are right at the back of the yoke where the 21, 28 are midship 👍
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John

i have MC28 forks here if you want a picture of them to compare

Pretty easy to tell the MC28 for 21 forks really. The caliper mounts (and consequently the calipers) are the give-away. Not only are they visually different to the MC18 and MC21, but the fork mounts are blind, and the calipers threaded.

Maybe the clip-ons are NC29 or NC30? I'm not sure if they have a different rake, which makes them come closer to the NSR frame on full lock? Just theorising!

Are the locating bosses present on the clip-ons? Maybe someone's cut them off to enable them to be pulled back more than standard, and you've just not noticed?
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Well I think that this may have outfoxed us all!

The lockstops are cast forward of centre, so it can't be Mc18 - "Mc 18 stem is a tidy bit longer the 21,28 and the stops are right at the back of the yoke where the 21, 28 are midship"
It can't be MC21 because otherwise they would work (unless the frame is wrong, but it's not)

So by process of elimination it should be MC28, except I don't think it is, can anyone confirm if 21 & 28 use the same lock stop casting position? Frame/vs/Yoke


...MC16 anybody?


Last edited by Max on Mon May 04, 2020 12:06 pm; edited 1 time in total

Ooops

Further images...

Andy wrote:Pretty easy to tell the MC28 for 21 forks really. The caliper mounts (and consequently the calipers) are the give-away. Not only are they visually different to the MC18 and MC21, but the fork mounts are blind, and the calipers threaded.

Maybe the clip-ons are NC29 or NC30? I'm not sure if they have a different rake, which makes them come closer to the NSR frame on full lock? Just theorising!

Are the locating bosses present on the clip-ons? Maybe someone's cut them off to enable them to be pulled back more than standard, and you've just not noticed?

That is good to know, I have threaded calipers and blind lower brake mounts, so 28's for the lowers. 👍

My guess is they are CBR400 NC29 yokes. I have a set of both the nc29 and mc28 somewhere so will check.

racer38 wrote:
My guess is they are CBR400 NC29 yokes. I have a set of both the nc29 and mc28 somewhere so will check.

Tom's cheating... cos there are hardly any options left!

So, saying that... could be MC22!
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