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R1 2003 Discs, Forks and a YZF750


johnalpi
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Hi all.

I have, as you may know, a YZF750. I bought some R1 2003 forks to replace my original ones. I have had some shims made up to fit the gap in the bottom yoke. I have the wheel aligned central, the callipers (also R1, blue star type) line up, but I have one big problem:

The 320mm discs on my YZF wheel are getting in the way of mounting the callipers on the fork mounts. The callipers are about 10mm away from the mounts.

Does anyone know what year R1 has 310mm discs other than 2003, should I be looking for a pre injection model?

I have also considered selling the 2003 R1 forks and buying a set of older R1 forks that would take a 320mm disc.

Has anyone done this? Has anyone got any suggestions?

Thanks for your help ppl,

John.

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why not just go and buy the correct calipers for the forks? it would save a lot of hassle and losing 10mm on the disc size wont make a lot of difference if any,with the correct calipers you may get better brakes

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Are you saying 2003 R1 uses 320mm discs, but the callipers from a 2003 R1 have a longer reach than the blue star R1 callipers?

If I could find a disc that would fit both YZF750 wheel and R1 callipers I would be happy to loose 10mm, that's not the problem:

Is there a difference in disc diameter between 2003 R1 and earlier R1's? If so what are they and what years do the changes appear on?

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i believe the 2003 models had the gold star calipers,if you notice new models with radial calipers have smaller discs to save on unsprung weight,which is what yamaha probably did on 2003 on models,i dont know what the disc sizes are for each year but if you bought the matching calipers for your forks you shouldnt have any problem selling your blue star calipers

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on ebay there is some gold star calipers for sale,item7963533977,at the they are going for £71 and he has the matching master cylinder,item7963534402.both have 2days11hours to go

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Early R1's ran 298mm discs.... In fact all R1's until the very latest one did. If you want to run R1 forks with the YZF wheel why not replace your disc with TRX850 298mm discs - These will bolt straight on. Alternatively you could use a Thunderace front wheel as this retains the speedo drive facility..... ;)

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This is great news :D

So I have two options:

1) Use a thunderace wheel, which will allow me to use R1 298mm (what a daft size!) discs and keep the speedo.

2) Use TRX850 discs on my standard YZF wheel and keep the speedo.

I now have two things to do a search on eBay for! Hallelujah!

Thanks guy's, I'm sure this will help others at some point. Will let you know what happens.

John.

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  • Admin

Thinking of disks, my bike jsut failed the mot on my front disks as they are slightly warped!!! Another bargain to buy forgot how much they cost :blink:

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This may help you:

Hi John,

A new pair of EBC Prolite discs (carriers and outers) for your '94

YZF750R would be £215, delivered in 2-3 working days.

Cheers

Vince

<[email protected]>

He was advertising on ebay. drop him a line. you were using ebc prolites weren't you? And there is the brembo(916/748) option...

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Hey cheers for that. BUT have spoken to EBC complaining saying that they are only just over a year old and they said to send them back.

And they will look at straightening or replacing so fingers crossed otherwise will give him a line

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  • 1 month later...

OK! So in the end I've went for the 750 wheel and TRX disc option.

I had to shave about 2mm of the inside of where the callipers mate to the fork legs to allow the discs to run through the callipers, I've head this is important ;)

I used the original spacer for the left hand side(looking at the front of the bike) had to shave off some of the speedo drive/spacer on the right. Also I made the bottom of the right hand fork the same width as the left.

All has been running well for the last 300 miles or so. Other than something is making a groove in the left hand disc. I can hear it digging in when I apply the brake, but the pad (all new EBC discs and pads BTW) is clean from any chunks of metal...... not sure what's going on there, but I'm in the garage again this afternoon with and electrical problem so I might get chance to look at it then.

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Pics you say?

Spacer in yoke

yamaha-yzf750-93-bikepics-365400.jpg

other one

yamaha-yzf750-93-bikepics-365403.jpg

I should have taken more off here and less off the spedo drive. I will now I have a spare drive

yamaha-yzf750-93-bikepics-365404.jpg

2mm off each face

yamaha-yzf750-93-bikepics-365406.jpg

yamaha-yzf750-93-bikepics-365408.jpg

Speedo drive

yamaha-yzf750-93-bikepics-365409.jpg

yamaha-yzf750-93-bikepics-365410.jpg

Original Spacer used

yamaha-yzf750-93-bikepics-365412.jpg

Speedo drive

yamaha-yzf750-93-bikepics-365413.jpg

Looks like it fits to me :D

yamaha-yzf750-93-bikepics-365414.jpg

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  • 7 years later...

John " there have been a couple of wars since these were asked for" :babyha: and another starting soon with korea,,, :popcorn:

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