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 Post Posted: Tue Aug 21, 2012 2:09 am 
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Hornet Warrior
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Joined: Wed Jun 10, 2009 10:41 pm
Posts: 233
Location: Oldham, Manchester
So... I've been doing some research into alternative front brake discs from other bikes that will fit the 250 Hornet and I hope I've finally got to the bottom of it.

It looks like there is only one disc that is a direct replacement fit and that is from the VTR250. The EBC code for these is MD1144RS (the RS just means 'Right Side')
There is a disc that is almost identical with code MD1003x that comes from the following models:
Image
The Galfer code for the MD1144RS is DF065 and for the MD1003X is DF027.
As you can see below, the only difference is 1mm of offset, 18mm on the Hornet/VTR and 17mm on the others
Image
Image

Many aftermarket brake disc manufacturers including Braking show these discs as being interchangeable and on the Braking website, their STX04 disc is shown as the correct fitment along with all the bikes above and many more
http://www.braking.com/catalogue/dettag ... colo=STX04

Can anyone give me a reason why using a disc with a 17mm offset on the 250 Hornet would cause a problem? Obviously it would run 1mm closer to the inside of the bike through the caliper but is there a problem with a disc not running perfectly centrally through the caliper?

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1997 250 HORNET - Twin Carbon Yamamotos/Hagon Shock/Coerce Bellypan :)
1998 600 Project underway!


Last edited by Firemonkey on Wed Aug 22, 2012 1:21 pm, edited 1 time in total.

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 Post Posted: Wed Aug 22, 2012 1:09 pm 
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Hornet Warrior
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Joined: Wed Jun 10, 2009 10:41 pm
Posts: 233
Location: Oldham, Manchester
OK, so I've discovered why the front disc on my hornet is warped.
The pistons on the right hand side of the caliper are not moving so the only braking on the disc was being done by the ones on the left.
Too much heat one one side of the disc compared to the other has made it warp.

So...after looking around online, I found a really cheap replacement caliper that comes with a stainless braided brake line.
Now, here's the catch...it isn't off a Hornet, it's off a VTR1000F Firestorm.
Now I know they use the same pads and look identical so I decided to take the risk.

Image of Firestorm caliper
Image

I'm also going to purchase a Firestorm disc and if need be, use 1mm spacers between fork leg and caliper to compensate for the 1mm difference in offset and ensure the disc runs centrally in the caliper.

What do you guys think?

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1997 250 HORNET - Twin Carbon Yamamotos/Hagon Shock/Coerce Bellypan :)
1998 600 Project underway!


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 Post Posted: Wed Aug 22, 2012 6:58 pm 
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Hornet Lord
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Joined: Wed Mar 21, 2012 7:46 pm
Posts: 681
Location: Manila, Philippines
thanks for sharing...


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 Post Posted: Thu Aug 23, 2012 10:07 am 
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That was some break!!!
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Joined: Sun Feb 13, 2011 8:39 pm
Posts: 97
Location: West of Scotland
Thanks for the useful info.

My front caliper was partially seized on my project 250 but I managed To pump the pistons out enough to clean them up.
It was a tricky job as the last brake I stripped was an a single pot 1976 Honda 500 twin...... not so easy with a 4 piston caliper :lol

Seems to be fine now but I bought a complete spare caliper off ebay for only £20 just in case.


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