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Discussion Starter #1
I recently saw the big bore kit at emoto for the 910r that punches it out to 990cc....as if I need it. It looks interesting, something i may want to do in the future, but I have some questions.

1. Who makes the pistons?

2. Is it a over-bored MV cylinder, or a new casting?

3. It looks like the water jackets are siamesed (best I can tell in the picture), is this the same for OEM? If not, are the bikes overheating with this set up?

4.Are the parts available seperatley? (just the pistons, I could have a local machine shop bore the cylinder)

5.Have you tried this set up with additional cylinder head and throttle body porting? Do you think it would be necessary or beneficial?

6.Lastly, what color underwear are you wearing, if any at all?

Thanks

Eric
 

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Some Guy said:
I recently saw the big bore kit at emoto for the 910r that punches it out to 990cc....as if I need it. It looks interesting, something i may want to do in the future, but I have some questions.

1. Who makes the pistons?

2. Is it a over-bored MV cylinder, or a new casting?

3. It looks like the water jackets are siamesed (best I can tell in the picture), is this the same for OEM? If not, are the bikes overheating with this set up?

4.Are the parts available seperatley? (just the pistons, I could have a local machine shop bore the cylinder)

5.Have you tried this set up with additional cylinder head and throttle body porting? Do you think it would be necessary or beneficial?

6.Lastly, what color underwear are you wearing, if any at all?

Thanks

Eric
Hi guys, its John here, some answers below:

1) Same company who made the kit for the F4 CC.

2) A brand new casting; the kit includes:
1x Complete cylinder assembly
4x Pistons & rings
1x Head gasket (thickness 0,7)
1x Cylinder base gasket
1x EPROM (ECU chip)

3) No, the bikes are not overheating with these kits, they have been on test on the Brutale 910R in Italy and work perfectly fine, please ignore the images as we will be uploading the correct professional photos shortly.

4) If you needed new pistons sure we can supply them seperately, same goes for the gaskets.

5) I think it is all done with the kits, we will confirm this point

6) Just don't wear white underwear, you think your 910R is quick in stock form... "you ain't seen nothing yet" :naughty: :smoking:

The stock 910R kicks out 136hp at the crank, with the 990cc kit, the Brutale pushes out about 175hp at the crank.

This kit is used on 990CR Brutale Platino, next month we will display dyno graphs on our site.
 

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Discussion Starter #5
I will be waiting anxiously....175 hp at the crank sounds like a shit stain of a good time, keeping with the underwear jokes of course.
 

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clandestinejinx said:
Man that is one heck of a power gain for 80 cc's. Does it have any effect on the rev range or compression?
Don't forget the 910 is supposedly tuned for midrange, Castiglioni always said he would never put the 1000 in the brutale, I always wanted one! and probably still do after my current 1000R, the 1000 makes 160/165 at the rear wheel, I see no reason why a sorted 990 Brutale can't make similar figures.

It would be interesting to sift through the parts manuals and see what different cams and chain wheels the 910 has, I may have a look later :)
 

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Discussion Starter #8
mikef4uk said:
I see no reason why a sorted 990 Brutale can't make similar figures.

It would be interesting to sift through the parts manuals and see what different cams and chain wheels the 910 has, I may have a look later :)

I have had the exact same thoughts since I picked mine up, there has to be a fair share of "hiden" horsepower lurking around in that engine.
 

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910s and R cams:
4 8A00A3030
5 8A00A3028

cam gears:
7 8000A3032
8 8000A5118

Pistons:
8000A3193

1000 cams:
4 8000A3030 S/Ago
4 8000A3723 Tamburini
5 8000A3028 S/Ago
5 8000A3721 Tamburini

Cam gears:
7 8000A3032 S/Ago/Tamburini
8 8000A3033 S/Ago
8 8000A3728 Tamburini

Pistons:
8000A3193



So 910R shares only cam gears, both in/exh with the Tamburini. And pistons, all 910 shared with all S, Ago, Tamburini.
 

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JamesC said:
910s and R cams:
4 8A00A3030
5 8A00A3028

cam gears:
7 8000A3032
8 8000A5118

Pistons:
8000A3193

1000 cams:
4 8000A3030 S/Ago
4 8000A3723 Tamburini
5 8000A3028 S/Ago
5 8000A3721 Tamburini

Cam gears:
7 8000A3032 S/Ago/Tamburini
8 8000A3033 S/Ago
8 8000A3728 Tamburini

Pistons:
8000A3193



So 910R shares only cam gears, both in/exh with the Tamburini. And pistons, all 910 shared with all S, Ago, Tamburini.
They number the parts in a strange way:

4= exhaust cam
5=Inlet cam
7= inlet cam wheel
8=exhaust cam wheel, so it shares everything except for the exhaust cam wheel-interesting! so who's going to be the first to change the exhaust cam wheel? you should end up with 167 (F4 1000) divide by 1000=0.167 (hp/cc)x 910=151hp!

Or 127 hp (F4 750) divided by 750=0.169 x 910 =154hp

which ever way you look at it there is hp hiding some where :stickpoke
 

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Discussion Starter #12
Someone told me that the cylinder heads were different, can anyone confirm this?
 
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