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YB8 Wet or Dry Weights
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bimotabob



Joined: 06 Jul 2013
Posts: 110
Location: New Zealand

PostPosted: Tue Dec 23, 2014 12:54 am    Post subject: YB8 Wet or Dry Weights Reply with quote

I finally set up a pair of 180kg identical calibrated scales to weight my bikes.

The YB8EI Furano weights 200.0kg Bias is 101/99 rear.

This is with oil and coolant etc but NO gasoline.

Claimed Bimota weight is 180Kg dry.
So they lied like the Japanese back in the 90's.

The bike has had weight reduction of around 5-10kg by myself and the stainless exhaust RS3 Yoshi isn't very heavy but don't have the original unfortunately to compare.

There's nearly a 10kg saving on the bike from forged aluminium rims which I'm thinking about though Smile


Are the other YB8 models similar?
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brian



Joined: 22 Aug 2011
Posts: 3769
Location: Australia

PostPosted: Tue Dec 23, 2014 7:38 am    Post subject: Reply with quote

Is dry weight measured (by manufacturers) with or without oil and coolant? Still... 20kg is a big difference
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brian



Joined: 22 Aug 2011
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Location: Australia

PostPosted: Tue Dec 23, 2014 7:39 am    Post subject: Reply with quote

There wasn't a small child sitting on it was there? Laughing
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'99 DB4 #104, '96 SB6 #1165, '94 DB2 J #652, '99 DB4 #088, '08 VTX1800, '93 ZXR750R M1, '95 ZXR750, '95 ZXR750 Race Bike, '94 CBR400rr NC29 Race Bike, '94 CB250, '49 BSA C10 250, '61 BSA A10 650, '89 ZXR750, '91 Ducati 851
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SpikeC



Joined: 20 Aug 2013
Posts: 450
Location: Portland, Oregon

PostPosted: Tue Dec 23, 2014 8:45 pm    Post subject: Reply with quote

Dry weight is measured without any fluids, and sometimes without battery.
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1965 Triumph T100SC
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Bud977



Joined: 03 Mar 2013
Posts: 525
Location: Sydney

PostPosted: Tue Dec 23, 2014 10:13 pm    Post subject: Reply with quote

I have always been curious as to the real weight of a YB8.

Wikipedia lists the weight of an FZR1000, the engine donor bike, as 209 kg (461 lb) (dry) 236 kg (520 lb) (wet). We know the Japs lied about these weights.

The YB8 has some things less than a FZR1000 but then the bodywork is pretty heavy.

I'd like to put my YB8 race bike on some scales when it's back together. It should be quite a bit less than a standard YB8. It has the following changed/removed with the corresponding weight saving estimate:

Raceglass 6kg
Starter/generator 7kg
Alternate wheels 5kg
Race pipe with carbon/kevlar muffler and no exup say 3kg
Road equipment removed say 3kg

That's 24kg! I'd love it if the bike started at 180kg and was now 156kg! I very much doubt it.

But still 200kg as you measured less 24kg is still pretty good for a big 4 cylinder 1000.
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brian



Joined: 22 Aug 2011
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Location: Australia

PostPosted: Wed Dec 24, 2014 12:08 am    Post subject: Reply with quote

Probably another kg in wiring if you ditch the stock harness and make a custom race harness too Wink . Insulated copper wire is surprizingly heavy, especially if theres 40 mtrs of un-neaded wire amongst it!
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bimotabob



Joined: 06 Jul 2013
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Location: New Zealand

PostPosted: Wed Dec 24, 2014 10:17 pm    Post subject: Reply with quote

Yeah I doubt the FZR1000 weighs 209kg dry.
I use the small 1989 radiator so would be even heavier with the 1991 larger radiator and more coolant!
Race exhaust can save quite a bit as the EXUP is quite heavy and peak HP gains are quite good I hear but i love EXUP.
I have had all the components off and looked at what each weighs and each they dont weigh a lot, although glass headlights don't help I'd rather have them than plastic.
I put goldline brembo master cylinders on it and removed the yamaha items as well as later plastic switch gear off the 1991 on models and fitted a new dash would all together saved several Kg's.
I also fitted a 1kg battery which saved over 4kg.
Interesting is I run the thunderace engine which in theory should be lighter so makes me wonder just how heavy the thunderace and FZR1000 models really weigh full of gas ready to go.

I have done a lot of work on the wiring loom but its still road going with extra you could take out for racing and I agree it would be worth doing.
For the road the wiring actual needed heavier cabling in several areas.
I removed the stock igniter and all its wiring and fitted a aftermarket EXUP controller but for race you would ditch all that and save a kg.


The wheels are very very heavy I have weighed all the wheel components from the stock akront/BBS and theres around a 9kg saving from dymag forged aluminium.
If they weren't $4000 NZD I'd have them!

I'm looking at changing to 525 chain soon when mine is stuffed, prob a kg saving and 525 is strong enough so no drama just a pain as have to machine the front sprocket as can't locate a 525 one for the spline.

So I'm looking at 190kg minus fuel if i change my wheels and final drive.
So finally the dry figure if you deducted oil and coolant say 5kg would be 185kg. 5kg more than Bimota's original claim. So originally it must have been 20kg plus more than what they said.

Bimota claimed their race YB8 to be very light. In the 160kg range i think. Although they made the frame with lighter aluminium.

Yes removing road gear and alt/starter light fairings wheels and exhaust must save 20kg plus as per your weights which sound accurate just the starting point was a lot more than 180kg so be great to hear what your race one weighs!

Yeah the YB8 isn't going to be heavy in comparison to new bikes surprisingly as if I change my wheels and go 525 the wet weight will be around what the BMW S1000RR is factory claimed and it has all the modern materials and engineering in its construction.
The Honda CBR1000RR is supposed to be crazy light though, I have heard remarkable claims of 200kg wet from Honda and 193kg wet from a review. I'm guessing its has a light exhaust and special scales as no way would the Japanese claim their bike weighs 6 or 7kg more NO WAY ha ha.
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Bud977



Joined: 03 Mar 2013
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Location: Sydney

PostPosted: Thu Dec 25, 2014 9:05 pm    Post subject: Reply with quote

Good work Bob!

R6 front sprockets fit the FZR motor so you have your choice of 525 or 520 sprockets. My bike will have a 520 chain instead of the stock 532.

Lithium batteries do save a heap of weight as well, don't they.
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brian



Joined: 22 Aug 2011
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Location: Australia

PostPosted: Fri Dec 26, 2014 2:15 am    Post subject: Reply with quote

Bud977 wrote:
Good work Bob!

R6 front sprockets fit the FZR motor so you have your choice of 525 or 520 sprockets. My bike will have a 520 chain instead of the stock 532.

Lithium batteries do save a heap of weight as well, don't they.


I've never raced Bud, but have always wondered what type of chains race bikes run. Do you run a sealed (o-ring/ x-ring) chain or just a plain chain. I'm guessing a plain (non-sealed) chain would offer less friction and therefor maybe a fraction better performance? Do you use chain lube or run dry? Just to satisfy my own curiousity Rolling Eyes
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brian



Joined: 22 Aug 2011
Posts: 3769
Location: Australia

PostPosted: Fri Dec 26, 2014 2:16 am    Post subject: Reply with quote

Bud977 wrote:
Lithium batteries do save a heap of weight as well, don't they.


Lithium batteries are a fraction of the weight of a standard lead acid or gell battery. I'm plannig on running one in my track bike.
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bimotabob



Joined: 06 Jul 2013
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Location: New Zealand

PostPosted: Fri Dec 26, 2014 7:33 am    Post subject: Reply with quote

The lithium battery has been working mint and would recommend them.
Its quite powerful and to lose over 4kg is a lot and the other reason i got one was the heavy one was causing my battery box to crack when it rocked around a little bit.

I was under the impression the spine was different to other Yamaha's?
I did look it up myself and couldn't find a 525 factory fitment, if what is being said here is true it will make me very happy since i don't have to get a 530 sprocket turned down width wise!!!

I get wonderful long life out of RK XW series chains which i think are there top road chains. Takes years to wear them out rain or shine and longer if you have a scottoiler set up correctly.
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Bud977



Joined: 03 Mar 2013
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PostPosted: Fri Dec 26, 2014 8:45 pm    Post subject: Reply with quote

What? You don't believe everything you hear on the internet? Wink Very Happy

Same here, so here's where I get my info from- The JT sprocket catalogue.

The FZR1000 has the Z-13 spline:

http://www.jtsprockets.com/catalogue/model/6558

The R6 also has the Z-13 spline and uses the 525 chain as standard:

http://www.jtsprockets.com/catalogue/model/6510

Many companies make a 520 conversion for the R6 which you can use, or use R1 sprockets if you want to use a 530 chain. All the bases are covered there.
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Bud977



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PostPosted: Sun Dec 28, 2014 12:16 am    Post subject: Reply with quote

Ooops my bad. The R1 shaft is a large diameter so you can't use R1 sprockets. R6 is still good.
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Bud977



Joined: 03 Mar 2013
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PostPosted: Sun Dec 28, 2014 12:36 am    Post subject: Reply with quote

I'm fitting an RK GB520GXW XW-Ring chain. This is a high performance & road race chain suitable for bikes up to 1000cc so it should be a beauty.

I use a bit of chain lube to make the aluminium rear sprocket last better.

I generally use a top quality race chain on all my race bikes. Once fitted I've never had to replace one. I use clip links on the smaller bikes and lockwire the clip.

Before I lockwired the clips, I once lost a chain at the apex of Turn One at Phillip Island on the RD250LC. That was certainly an experience. The back wheel locked up at maybe 150 kph, skidded along and to the outside of the track, through the gravel trap, out the other side, onto the grass and still sliding side to side. That was a LONG slide.
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bimotabob



Joined: 06 Jul 2013
Posts: 110
Location: New Zealand

PostPosted: Sun Dec 28, 2014 5:29 am    Post subject: Reply with quote

Ok mint so the spline is correct and it will go on but what about the width.
The FZR is 11.0 wide sprocket and the R6 is 10.8 - thats total width looking at the diagram.
So the 525 sprocket mating surface is narrower than 530/532 but sprockets often have a centre boss wider than this which spaces the sprocket out from the engine accordingly which is worth noting.

What i am trying to get my head around is say i fit a rear sprocket to my bike which is 525 - blank aluminium machined to suit.
An then i purchase a front R6 sprocket will it line up with the rear?
As the chain centre will move inwards at the rear with the rear sprocket change so as long as the front chain centre moves inwards same amount it will be right but not sure whether this is so from that info.

Not sure if i'm making myself clear - could probably say all that in one sentence ha ha
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