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SB6 r won't Rev in higher gears
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Horseheed



Joined: 31 Aug 2018
Posts: 22
Location: Co Durham

PostPosted: Fri Aug 31, 2018 1:20 pm    Post subject: SB6 r won't Rev in higher gears Reply with quote

Hi, iam new to Bimota so please be gentle, i am having trouble with my SB6r it runs but when I change gear in 3rd or 4th it won't rev and bogs down . Plugs are ok and all pipes are hot . Any help would be much appreciated. Cheers
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Evilchicken0



Joined: 12 May 2010
Posts: 2813
Location: London

PostPosted: Fri Aug 31, 2018 2:07 pm    Post subject: Reply with quote

Not heard that one before.

Check the carbs / airbox are properly on and not leaking air.
Check the carb seals haven't broken down, the main jets are clean etc.

Are you running the original fuel pump Ö they can be troublesome.
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Jonny B Bad



Joined: 05 Dec 2009
Posts: 412
Location: NE London

PostPosted: Fri Aug 31, 2018 2:28 pm    Post subject: SB6R Reply with quote

Anything been done to the bike, or has it started doing it out of the blue?
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Horseheed



Joined: 31 Aug 2018
Posts: 22
Location: Co Durham

PostPosted: Fri Aug 31, 2018 3:14 pm    Post subject: Re: SB6R Reply with quote

Jonny B Bad wrote:
Anything been done to the bike, or has it started doing it out of the blue?
. It's been stood a few weeks before I bought it, I've cleaned the carbs out twice and fitted them back properly. I was trying not to remove them again as they were a pain to refit. Many thanks for any info you can help me with Cheers
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Horseheed



Joined: 31 Aug 2018
Posts: 22
Location: Co Durham

PostPosted: Fri Aug 31, 2018 10:06 pm    Post subject: Reply with quote

Many thanks for the replys , could it be the fuel lines ? I've removed the fuel pump but am I right in thinking the fuel lines go straight into the carbs OR should the fuel pipes go in on an angle ? Cheers
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brian



Joined: 22 Aug 2011
Posts: 2699
Location: QLD, Australia

PostPosted: Fri Aug 31, 2018 10:50 pm    Post subject: Reply with quote

Checked air filter, fuel lines, fuel tap etc?
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brian



Joined: 22 Aug 2011
Posts: 2699
Location: QLD, Australia

PostPosted: Fri Aug 31, 2018 10:50 pm    Post subject: Reply with quote

Stale fuel maybe?
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Current motorcycles - '99 Bimota DB4, '96 Bimota SB6, '08 VTX1800, '93 ZXR750R M1, '95 ZXR750, '95 ZXR750 Race Bike, Ď94 CBR400rr NC29 Race Bike, '94 CB250, '49 BSA C10 250, Ď61 BSA A10 650
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jerry



Joined: 29 Jul 2018
Posts: 4
Location: Huddersfield

PostPosted: Sun Sep 02, 2018 2:33 pm    Post subject: sb6 flat spot in midrange/higher gears Reply with quote

I have the same problem on my newly bought SB6R .have had float heights checked but am not confident they have been set correctly ( as per manual ) .As my bike has only covered 52 miles in last 4 years my next step is to clean out tank filter and reset float heights as per manual.also found no vacuum pipe connected tp fuel pump in airbox , but reconnecting did not solve problem. would appreciate eny input/info on this problem
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brian



Joined: 22 Aug 2011
Posts: 2699
Location: QLD, Australia

PostPosted: Sun Sep 02, 2018 11:17 pm    Post subject: Reply with quote

A good clean is a must if itís been sitting.

As others have said... remove the pump and just gravity feed.

Float heights can definitely make a difference.
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Current motorcycles - '99 Bimota DB4, '96 Bimota SB6, '08 VTX1800, '93 ZXR750R M1, '95 ZXR750, '95 ZXR750 Race Bike, Ď94 CBR400rr NC29 Race Bike, '94 CB250, '49 BSA C10 250, Ď61 BSA A10 650
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lorenzo



Joined: 20 Aug 2018
Posts: 17

PostPosted: Mon Sep 03, 2018 8:26 am    Post subject: Reply with quote

hello guys, i had the same problem on my sb6R.

still waiting to understand the reasons behind but for the moment i solved the problem installing a piece of cotton (piece of t-shirt) on top of air filter.

basically there is my filter in foam plus this small piece of cotton (10 cm x 5cm)

lore
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brian



Joined: 22 Aug 2011
Posts: 2699
Location: QLD, Australia

PostPosted: Mon Sep 03, 2018 9:54 am    Post subject: Reply with quote

Iím no expert, but Iíd say that indicates that itís running lean for some reason. Maybe a partly blocked jet or float level too low?
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Current motorcycles - '99 Bimota DB4, '96 Bimota SB6, '08 VTX1800, '93 ZXR750R M1, '95 ZXR750, '95 ZXR750 Race Bike, Ď94 CBR400rr NC29 Race Bike, '94 CB250, '49 BSA C10 250, Ď61 BSA A10 650
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Horseheed



Joined: 31 Aug 2018
Posts: 22
Location: Co Durham

PostPosted: Mon Sep 03, 2018 11:40 am    Post subject: Reply with quote

brian wrote:
A good clean is a must if itís been sitting.

As others have said... remove the pump and just gravity feed.

Float heights can definitely make a difference.
Hi thanks for your help ,Iíve not touched the floats as I donít know how to check Or adjust them so any info would be great. Cheers Nigel
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Evilchicken0



Joined: 12 May 2010
Posts: 2813
Location: London

PostPosted: Mon Sep 03, 2018 2:42 pm    Post subject: Reply with quote

Take it to a dyno and get it tuned. I know it's inconvenient and might sound expensive but if you don't know or cant find what the problem is then your just "trying things" and hoping for a lucky shot. Take it to a dyno pay the money and it will be ready to ride.
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brian



Joined: 22 Aug 2011
Posts: 2699
Location: QLD, Australia

PostPosted: Mon Sep 03, 2018 10:31 pm    Post subject: Reply with quote

Thatís ok if thereís a dyno within a few hrs of you, and someone who knows how to operate the thing properly. Otherwise trial and error may be the only practical thing to do.

Change ONE thing at a time and see what makes a difference
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mick



Joined: 10 May 2015
Posts: 32

PostPosted: Tue Sep 04, 2018 9:48 am    Post subject: sb6r won't rev in higher gears Reply with quote

I bought a brand new sb6r in 2002 it had a similar problem ! it turned out that the overflow pipe was blocked and when it rained it filled the petrol filler cap with water, when you opened the cap it disappeared into the petrol tank.
In the airbox there was a fuel filter half full of water it would run but when you asked for more power the water was sucked against the filter and wouldn't rev!
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