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sb6r carb specifications.

 
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2OR4STROKES



Joined: 12 Dec 2008
Posts: 67
Location: Singapore

PostPosted: Wed Nov 30, 2011 1:21 pm    Post subject: sb6r carb specifications. Reply with quote

Hi

Hope that someone can help me on this.

Been riding my sb6r regularly and found that the low end from transition to throttle opening is not smooth and if fact a little jerky. It is smooth everywhere else above 3000rpm. I know and I don't ride at such low rpm but during traffic jams this transition irritiates me. I need to open up the carbs to check the jettings and settings, float level etc. Can someone who has the info please help ?

I almost forgot , does the SB6r run a little fluffy at low rpms from transition to just initial throttle openings? I bought mine 2nd hand so I may never know for sure is it due to different cams,carbs, settings etc. I am sure the gsx r 1100 engines made by the japs is not like that from the factory.(knowing how the japs do bike that is)
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Evilchicken0



Joined: 12 May 2010
Posts: 2996
Location: London

PostPosted: Wed Nov 30, 2011 2:33 pm    Post subject: Reply with quote

The 6R has a fuel pump which owners tend to trow away. The 40mm carbs do take some setting up though, but first things first check / clean the air filter, clean the carbs, and make sure they're ballanced.

Although it can be expensive have it put on a rolling road.
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oily



Joined: 05 Apr 2008
Posts: 4788
Location: worcestershire

PostPosted: Wed Nov 30, 2011 2:59 pm    Post subject: Reply with quote

Not the smoothest even when set up Wink
Throw the fuel pump away and let gravity do it's thing.
Clean the gauze strainer in the tank and the fuel filter in the air box then enjoy Laughing
If these things don't work, I'll sort out the workshop manual Wink
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2OR4STROKES



Joined: 12 Dec 2008
Posts: 67
Location: Singapore

PostPosted: Wed Nov 30, 2011 8:24 pm    Post subject: Reply with quote

Thanks Very Happy .

Throw the fuel pump away? Why? I thought my bike was out of syn based on the symptoms . I did take it out once when it was overflowing due to the float level and set at air/fuel mixture screw to 2.5 turns out. is that even correct because it can't be set once the carbs are installed due to the ridiculous design. I can't even adjust it to the best or smoothest idle with the engine running is what I mean. Rolling Eyes
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oily



Joined: 05 Apr 2008
Posts: 4788
Location: worcestershire

PostPosted: Wed Nov 30, 2011 8:28 pm    Post subject: Reply with quote

Throw the pump away because it is what causes the carbs to overflow( on the over run) not the float height Wink
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oily



Joined: 05 Apr 2008
Posts: 4788
Location: worcestershire

PostPosted: Wed Nov 30, 2011 8:38 pm    Post subject: Reply with quote

Wink

http://www.bimotaforum.co.uk/viewtopic.php?t=702&highlight=fueling

the search button is your friend Wink
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stockcar



Joined: 07 Apr 2011
Posts: 836
Location: in the shadow of the "angel"

PostPosted: Wed Nov 30, 2011 9:46 pm    Post subject: Reply with quote

intriguing i have always been mighty impressed with the low end response of my 6R............maybe thats because i also have some pukka old skool rides??
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2OR4STROKES



Joined: 12 Dec 2008
Posts: 67
Location: Singapore

PostPosted: Thu Dec 01, 2011 4:38 pm    Post subject: Reply with quote

Hmm Hmm very very interesting all that has been said by you guys.

My bike is not overflowing now with the vacuum pump but i do feel it is a tad rich at low rpms . Oily can you let me know what is the standard setting as compared to what you are running now? I do see your 165 main jets and etc.

I'll take the pump off and see what happens. Why did Bimota put it there is it can just run on gravity? Are the engineers sleeping or italians are just italians riding at full throttle all day long that is , so a vacuum pump works.
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oily



Joined: 05 Apr 2008
Posts: 4788
Location: worcestershire

PostPosted: Thu Dec 01, 2011 4:59 pm    Post subject: Reply with quote

2OR4STROKES wrote:
Why did Bimota put it there is it can just run on gravity?


Why indeed Wink

Why did Bimota think they could build the perfect 500 two stroke?

I'll look up the settings later Wink
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oily



Joined: 05 Apr 2008
Posts: 4788
Location: worcestershire

PostPosted: Thu Dec 01, 2011 6:22 pm    Post subject: Reply with quote

Standard settings according to Bimota's workshop manual.........

Mikuni BST 40SS

I.D. number....46E2
Idle r.p.m....1100rpm
Float height....14.7mm
Main Jet....127.5
Main Air jet....2.0mm
Jet needle....6ZD20-4ta
Needle jet....P-2
Throttle Valve....120
Slow running jet....40
Air screw...1 3/4 out

Hope that helps because it didn't help me Laughing
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2OR4STROKES



Joined: 12 Dec 2008
Posts: 67
Location: Singapore

PostPosted: Wed Dec 14, 2011 5:24 pm    Post subject: Reply with quote

Hi

Thanks Oily for the carb specifications. I'll check mine when I'm free
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