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Bimota Forum Forum for Bimota Owners and Riders
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GeeKay
Joined: 29 May 2009 Posts: 1767 Location: West Yorkshire
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Posted: Fri Apr 28, 2017 8:51 pm Post subject: |
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My SB6-R on it's first ride out with me on board.............
such a pretty bike that quite a few people turned out to see it.........
the bike-mounted policeman asked me to pull over to the side of the road so people could take pictures of it...........
but their pictures were ruined when a large peloton of cyclists went sailing past.......
Bloody Tour de Yorkshire.................
_________________ Bimota SB6 and Benelli TNT 899S road bikes.
Beta Techno trials iron. Project bikes:- Suzuki V4 500, TS185 cafe racer, XR11/71, Kettle/Katana, TDRGV250, OR50, Gag125,Triumph T595 and a Triumph X75 Hurricane replica.
Too many projects............... |
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brian
Joined: 22 Aug 2011 Posts: 3769 Location: Australia
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Posted: Fri Apr 28, 2017 11:10 pm Post subject: |
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Inconsiderate cyclists!
Nice pics GeeKay. First impressions of the 6R? _________________ '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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GeeKay
Joined: 29 May 2009 Posts: 1767 Location: West Yorkshire
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Posted: Sat Apr 29, 2017 3:45 pm Post subject: |
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it's got a fluffy bottom-end - the pilot jets need attention. Above 2500 rpm, it's a missile, powered by one of Suzuki's finest motors and guided by Bimota's excellent chassis and the fitment of quality suspension.
_________________ Bimota SB6 and Benelli TNT 899S road bikes.
Beta Techno trials iron. Project bikes:- Suzuki V4 500, TS185 cafe racer, XR11/71, Kettle/Katana, TDRGV250, OR50, Gag125,Triumph T595 and a Triumph X75 Hurricane replica.
Too many projects............... |
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Tirefriar
Joined: 18 Dec 2014 Posts: 659 Location: USA
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Posted: Sat Apr 29, 2017 4:02 pm Post subject: |
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Very nice example GeeKay! Congrats _________________ 1991 Bimota YB10
2001 MV F4
2003 Aprilia RSV Mille CE Replica
2004 BMW R11S BCR
2010 Ducati Streetfighter 1098 S |
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Spongebob
Joined: 03 May 2016 Posts: 144 Location: Oxfordshire
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Posted: Mon May 01, 2017 10:54 am Post subject: |
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GeeKay wrote: |
it's got a fluffy bottom-end - the pilot jets need attention. Above 2500 rpm, it's a missile, powered by one of Suzuki's finest motors and guided by Bimota's excellent chassis and the fitment of quality suspension.
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Exactly the same on mine. Here's the dyno chart from PDQ. You can see they have cleaned it right up and it's massively improved and a much nicer ride. Larry said most of the issue was lack of use and the general amount of crud, gunk and corrosion in the carbs. They need to be used or properly drained down.
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Jonny B Bad
Joined: 05 Dec 2009 Posts: 555 Location: NE London
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Posted: Tue May 02, 2017 9:41 am Post subject: SB6R |
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GeeKay, I would check one or two other things before you change the pilots: if you still have the fuel pump in the air box - it needs to be removed and binned. If it hasn't had the valve clearances done yet (every 7,500 miles) - that may well help. I'm on the original pilots and it's very crisp on the pick-up from idle.
Interesting what you say about the suspension - properly set up, I think the Paioli/ Ohlins combo makes for a comfortable ride, but a pair of Ohlins at the sharp end, can improve it - but not much point unless the heavy wheels are ditched. This is a bike which can be transformed from a GT to a pretty sharp tool, all the way up to the point where you start regretting that the motor, despite being the "jewel in the crown" is also a heavy old lump.
My advice is don't ever ride a heavily modified 6R or you'll be divorced within a year, as you embark on your own pursuit of perfection _________________ What, Jonny's gone! |
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Evilchicken0
Joined: 12 May 2010 Posts: 2996 Location: London
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Posted: Tue May 02, 2017 1:57 pm Post subject: |
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GeeKay wrote: |
it's got a fluffy bottom-end - the pilot jets need attention. Above 2500 rpm, it's a missile, powered by one of Suzuki's finest motors and guided by Bimota's excellent chassis and the fitment of quality suspension.
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Above 2500 rpm I think I see the problem !!! It only idles at 1600. Do what Jonny suggests and maybe clean the jets _________________ Don't read everything you believe |
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GeeKay
Joined: 29 May 2009 Posts: 1767 Location: West Yorkshire
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Posted: Wed May 03, 2017 1:12 pm Post subject: Re: SB6R |
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Jonny B Bad wrote: |
GeeKay, I would check one or two other things before you change the pilots: if you still have the fuel pump in the air box - it needs to be removed and binned. If it hasn't had the valve clearances done yet (every 7,500 miles) - that may well help. I'm on the original pilots and it's very crisp on the pick-up from idle.
I do intend to keep the original jets - just think they need cleaning out as the bike has been stood for some time - much the same as Spongebob's. The fuel pump will be removed at the same time as the carbs are cleaned. Interestingly, the tick over was set at 3000rpm................
My advice is don't ever ride a heavily modified 6R or you'll be divorced within a year, as you embark on your own pursuit of perfection
no danger of that happening - the last 3 Bimota's took care of that !
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_________________ Bimota SB6 and Benelli TNT 899S road bikes.
Beta Techno trials iron. Project bikes:- Suzuki V4 500, TS185 cafe racer, XR11/71, Kettle/Katana, TDRGV250, OR50, Gag125,Triumph T595 and a Triumph X75 Hurricane replica.
Too many projects............... |
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Jonny B Bad
Joined: 05 Dec 2009 Posts: 555 Location: NE London
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Posted: Wed May 03, 2017 2:56 pm Post subject: SB6R |
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For it to have been set at such a high idle suggests another problem I'm afraid. Ethanol in petrol attacks the plastic fuel tank, or its lining. As the fuel/plastic combination separates in the carbs, a white-ish deposit is left in the carbs. This deposit naturally blocks the smallest jets first - namely the pilots, preventing the thing from idling at the prescribed 1100 rpm. The solution is an ultrasonic clean of the carbs and a re-line of the tank. If you just clean the carbs, the problem will be back again in short order, necessitating another ultrasonic clean of the carbs. You will be able to see if you have this problem when you pull the carbs, as you will see the throat of the carb, downstream of the butterfly, streaked with the white-ish deposit.
I have seen this problem explained away by sellers of bikes as being the result of the 6R being like a race bike that only runs properly once it is opened up. Complete tripe of course, because the motor is from a road bike! _________________ What, Jonny's gone! |
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stockcar
Joined: 07 Apr 2011 Posts: 836 Location: in the shadow of the "angel"
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Posted: Wed May 03, 2017 8:49 pm Post subject: |
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STD 6R carburates perfect and is so torquey & crisp off cam |
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Jonny B Bad
Joined: 05 Dec 2009 Posts: 555 Location: NE London
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Posted: Thu May 04, 2017 9:24 am Post subject: 6R |
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Whilst I do spend a lot of time with mine and sometimes late at night, I don't think I've given it an STD yet _________________ What, Jonny's gone! |
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GeeKay
Joined: 29 May 2009 Posts: 1767 Location: West Yorkshire
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Posted: Thu May 04, 2017 10:38 am Post subject: |
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done a forum search regarding SB6R fuel pumps, but that turned up 900+ posts, mainly about SB8R's?
So - educate me please - whats the problem with the fuel pump, why did Bimota fit one in the first place and is it just a case of pump out / new feed pipes in?
Ta. _________________ Bimota SB6 and Benelli TNT 899S road bikes.
Beta Techno trials iron. Project bikes:- Suzuki V4 500, TS185 cafe racer, XR11/71, Kettle/Katana, TDRGV250, OR50, Gag125,Triumph T595 and a Triumph X75 Hurricane replica.
Too many projects............... |
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Evilchicken0
Joined: 12 May 2010 Posts: 2996 Location: London
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Posted: Thu May 04, 2017 2:47 pm Post subject: |
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I "think" they were trying to adress the fuel tap on the 6 being a vacuum one, you have to turn the engine over to get fuel into the carbs ... fine if us used often but ither wise it needs a bit of turning over before it catches.
And the 6 can fuel starve if the fuel pipes feed the carbs from the top. _________________ Don't read everything you believe |
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Jonny B Bad
Joined: 05 Dec 2009 Posts: 555 Location: NE London
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Posted: Thu May 04, 2017 2:59 pm Post subject: SB6R |
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I've read that Bimota put a pump in to address starvation issues at full chat. However, it is a vacuum operated pump, so it is operating from idle, where it can give rise to over-fuelling. With the fuel tank higher than the carb float bowls, there was no reason it shouldn't run on gravity, which it does and I've never been conscious of starvation further up the rev range having removed it. I removed the vacuum hose from the manifold and blanked off the spigot and the hole in the air box. I then re-plumbed with a "1 in - 2 out" Pingel fuel filter replacing the original fuel filter and "Y" piece. To be fair, I replaced the heavy exhaust and increased the size of the main jets accordingly, which may have addressed starvation further up the range which I might otherwise have experienced, absent the fuel pump.
In the opinion of some, the 6R suffers from too small an air box. Whilst it doesn't seem to struggle feeding a big bore motor, if true, it could only be helped by taking the fuel pump out. _________________ What, Jonny's gone! |
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Evilchicken0
Joined: 12 May 2010 Posts: 2996 Location: London
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Posted: Thu May 04, 2017 3:06 pm Post subject: |
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It's the 6 that has the small airbox, the R has the extra below the fuel tank _________________ Don't read everything you believe |
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