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YB7 fron master cylinder size?
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who



Joined: 10 Nov 2010
Posts: 338
Location: Melbourne Australia

PostPosted: Thu Jun 28, 2018 8:20 am    Post subject: Reply with quote

Hey bud, only 10,500 rpm? is that rev limiter? seems low.
Also the 40mm disc spacers, are they for the smaller 310mm R1 discs, or spacing issues?
Nicely presented bike!
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Bud977



Joined: 03 Mar 2013
Posts: 360
Location: Sydney

PostPosted: Thu Jun 28, 2018 9:11 pm    Post subject: Reply with quote

That's where it makes max power. I can rev it further if I want. 145 rwhp on pump fuel.

We could have tuned it for more power on the dyno but it would have made the engine more peaky, more susceptible to wheelspin and wheelstands. That would be a lot of fun but not my style on the track. The dyno guy knows how I ride so we set it up for that.

The front caliper spacers are to allow for the disc spacing. The standard R1 disc fixing bolts hit the fork legs as the discs are so close to the forklegs. I had to recess them into the disc and machine a bit off the heads to make them clear. The disc determined the caliper location.

It took a fair bit of thought, measurement and fabrication to get the R1 wheels to fit but in the end it was perfect. I retained the beautiful rear caliper bracket, now have a 6" rear rim and a choice of 520 R1/R6 aftermarket sprockets.

I just bought another set of R1 wheels to make into wets. These have the 310mm discs so I may need to make another caliper bracket for the front. I lucked out with the 320s on my first set of wheels as these only came out on 2 years of R1s so not all that common.
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brian



Joined: 22 Aug 2011
Posts: 2491
Location: QLD, Australia

PostPosted: Fri Jun 29, 2018 12:24 am    Post subject: Reply with quote

Bud977 wrote:
That's where it makes max power. I can rev it further if I want. 145 rwhp on pump fuel.

We could have tuned it for more power on the dyno but it would have made the engine more peaky, more susceptible to wheelspin and wheelstands. That would be a lot of fun but not my style on the track. The dyno guy knows how I ride so we set it up for that.

The front caliper spacers are to allow for the disc spacing. The standard R1 disc fixing bolts hit the fork legs as the discs are so close to the forklegs. I had to recess them into the disc and machine a bit off the heads to make them clear. The disc determined the caliper location.

It took a fair bit of thought, measurement and fabrication to get the R1 wheels to fit but in the end it was perfect. I retained the beautiful rear caliper bracket, now have a 6" rear rim and a choice of 520 R1/R6 aftermarket sprockets.

I just bought another set of R1 wheels to make into wets. These have the 310mm discs so I may need to make another caliper bracket for the front. I lucked out with the 320s on my first set of wheels as these only came out on 2 years of R1s so not all that common.


I remember your build thread well Bud, really enjoyed keeping up with your progress. It was a lot of work but you did a great job.
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Current rides - '99 Bimota DB4, '96 Bimota SB6, '08 VTX1800, '93 ZXR750R M1, '95 ZXR750, '95 ZXR750 Race Bike, CBR400rr NC29 Race Bike, '94 CB250, '49 BSA C10 250,
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Bud977



Joined: 03 Mar 2013
Posts: 360
Location: Sydney

PostPosted: Fri Jun 29, 2018 10:04 pm    Post subject: Reply with quote

Thanks Brian. I'll have to get back to making the two piece closed in fairing, and the RGV250 resto, and the RD350LC resto, and the TZ250 fairings and........
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brian



Joined: 22 Aug 2011
Posts: 2491
Location: QLD, Australia

PostPosted: Sat Jun 30, 2018 12:35 am    Post subject: Reply with quote

Bud977 wrote:
Thanks Brian. I'll have to get back to making the two piece closed in fairing, and the RGV250 resto, and the RD350LC resto, and the TZ250 fairings and........


Ahh projects Laughing

Iíve had plenty of spare time to work on my many projects! Been off work for 7 weeks now and sat at home.... only problem is I canít do a damn thing Crying or Very sad Crying or Very sad
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Current rides - '99 Bimota DB4, '96 Bimota SB6, '08 VTX1800, '93 ZXR750R M1, '95 ZXR750, '95 ZXR750 Race Bike, CBR400rr NC29 Race Bike, '94 CB250, '49 BSA C10 250,
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Jgmansfield



Joined: 11 Aug 2017
Posts: 13
Location: NYC

PostPosted: Sat Jul 07, 2018 2:51 am    Post subject: Reply with quote

Ah, the YB8!
There was one for sale last year with almost no miles, wish Iíd had the cash.... what a bike! Pinnacle of Bimota bikes in my opinion.
One day!
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Bimota YB7
748R
NSR250
NSR500 Rothmans (rep)
YZR500 Norik Abe (rep)
YZR500 Max Biaggi (rep)
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Jgmansfield



Joined: 11 Aug 2017
Posts: 13
Location: NYC

PostPosted: Fri Jul 13, 2018 11:22 am    Post subject: Brembo front master replacement Reply with quote

So itís done, the correct Brembo front master is 16 x 18, or 16mm by whatever lever ratio you want, the important number is 16mm. Installed it yesterday and have great feel and one finger braking. The ďwoodenĒ feel is from too large a master for the caliper, 18mm etc, I did this on the YZR, Loads of power but dangerously wooden and no feel.

Thanks for all the great advice!

James
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Bimota YB7
748R
NSR250
NSR500 Rothmans (rep)
YZR500 Norik Abe (rep)
YZR500 Max Biaggi (rep)
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Bud977



Joined: 03 Mar 2013
Posts: 360
Location: Sydney

PostPosted: Fri Jul 13, 2018 9:53 pm    Post subject: Reply with quote

Well done.

On another tangent, I saw the latest work-in-progress by Mick Costin this week - another NSR500 replica. He does great work The handmade swingarm is exquisite. The custom frame looked like it was based on Honda spars. RD500 engine. The bodywork has been done and painted to a high standard as you would expect. Nice.
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2bims



Joined: 03 Apr 2010
Posts: 5222

PostPosted: Sat Jul 14, 2018 10:17 am    Post subject: Reply with quote

who wrote:
Great article and vid. What a beast!

I've got a bit of Dohan here as well! His oran park 2x win WSK FZR750. Which i think were his first world championship career wins, and certainly kick started his international career.

I've been collecting parts to complete it for years (it's all works stuff) and I'm happy to say I nearly have everything I need to get started on the build.

I need a kit 88 FZR swingarm peeps? Anyone?? but that is about it!

Cheers



Whats a "kit" 88 version? As in Race kit?...seems plenty of swingarms in the UK...although I'd have no idea which was what

https://www.ebay.co.uk/sch/i.html?_from=R40&_trksid=p2055119.m570.l1313.TR12.TRC2.A0.H0.Xfzr1000+swingarm.TRS0&_nkw=fzr1000+swingarm&_sacat=0
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who



Joined: 10 Nov 2010
Posts: 338
Location: Melbourne Australia

PostPosted: Mon Jul 16, 2018 10:43 am    Post subject: Reply with quote

Hi Steve, Similar to this. No anodizing and heavily modified and braced. This one is FZ750.



This the frame,



Forks are billet showa, for 40 mm goldlines. (Adapters for OW01 calipers go) Adjustable offset magesium triples etc.



A recently acquired Yec kit exhaust Smile... The tail pipe sections are formed from from flat sheet, and formed into round sections (just because they can)!



The list goes on. No part of the bike was oem.... all supplied by the Yamaha race department. Y.E.C.



Not Bimota, but pretty cool!
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brian



Joined: 22 Aug 2011
Posts: 2491
Location: QLD, Australia

PostPosted: Tue Jul 17, 2018 12:43 am    Post subject: Reply with quote

Wow, thatís gorgeous stuff mate!
_________________
Current rides - '99 Bimota DB4, '96 Bimota SB6, '08 VTX1800, '93 ZXR750R M1, '95 ZXR750, '95 ZXR750 Race Bike, CBR400rr NC29 Race Bike, '94 CB250, '49 BSA C10 250,
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