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Evilchicken0
Joined: 12 May 2010
Posts: 2996
Location: London
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 Posted: Tue Jul 16, 2013 8:39 am Post subject: |
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I use these people
http://www.redcarmotorcycles.co.uk/parts.html this is the contact page.
You're sure its the floats ? You can see the fuel on them when you hold a torch underneath ? Its not the valves, the float bowl gaskets or somebody didn't tighten the bolts or the drain plugs ???
Its odd this happens to more than one of the carbs, have the floats been set wrongly ... check your float height
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bimota_rider
Joined: 06 Jul 2013
Posts: 213
Location: Utah, USA
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| Posted: Tue Jul 16, 2013 4:16 pm Post subject: |
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Evil said:
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You're sure its the floats ? You can see the fuel on them when you hold a torch underneath ? Its not the valves, the float bowl gaskets or somebody didn't tighten the bolts or the drain plugs ???
It is odd this happened to more than one of the carbs, have the floats been set wrongly ... check your float height |
Here is what I have found. The fuel literally dumps out of the idle jet (?) those little holes at the leading edge of the venturi dish. When I test it off of the bike I simply turn the carbs upside down with a generous fuel supply, the needles close on the seats using gravity as opposed to float pressure. as soon as the gravity shuts the needles on the seats the flooding stops, cold! I can do the same test with air pressure from my mouth and the needles close air tight and I cannot get any air to seep past the needle valves as hard as I can blow.
As far as them being installed improperly, as far as I can see there is only one way for them to be installed. I also found it odd that all four failed at once, but they have sat for three years, dry. I read somewhere, just the other day, that is the "death nail" for carb floats.
As I have said before and am NOT shy about admitting, I am NO carb expert, but I'm learning everyday.
I measured the float height with the carb bowl full to the gasket and it measured 15mm and the manual I have says 18mm, but that is the 36s found on the US spec 1100W. They way they are designed, there doesn't seem to be an accurate way to adjust the needle hanger. If I can't find the correct floats soon, I plan to attempt to start bending the hanger tab and adjust the floats that way. It is just sooooo much work to adjust, test, re-teardown , adjust, reinstall, test, re-teardown, adjust......etc.
BTW: The floats do not leak and are not filling with fuel, as far as I can see. I think they are just "heavy" because they are old and they sat in air (dry) and that did something to the plastic itself. (?????) I will say this: "This whole thing is certainly testing the resolve of this amateur"
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'98 Bimota SB6R #000016 "Sweet 16"
Built 5/97
2014 Suzuki Hayabusa
2001 BMW R1100S
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CBar
Joined: 05 Jan 2010
Posts: 142
Location: Texas
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| Posted: Tue Jul 16, 2013 5:02 pm Post subject: |
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The float height is supposed to be 14.7 mm, so you are close enough.
Canada had 40mm carbs. I don't think you will find another U.S. spec bike using the 40's. The 40's are a little big, so you could always try 38's off a 750.
I recommend removing the electric fuel pump and seeing if that fixes your problem. |
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Evilchicken0
Joined: 12 May 2010
Posts: 2996
Location: London
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| Posted: Tue Jul 16, 2013 5:46 pm Post subject: |
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Damn I missed it was a 6R ... yes ditch the fuel pump.
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stockcar
Joined: 07 Apr 2011
Posts: 836
Location: in the shadow of the "angel"
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| Posted: Tue Jul 16, 2013 8:17 pm Post subject: |
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France had (still has??) a silly 100bhp limit, not here  |
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bimota_rider
Joined: 06 Jul 2013
Posts: 213
Location: Utah, USA
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| Posted: Wed Jul 17, 2013 12:46 am Post subject: |
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My bike has a vacuum operated fuel pump. It is working beautifully.
I heard many years ago about people using electric fuel pumps from the Kawasaki Ninja 600 for the SB6R. But, that was only because the vacuum pump seemed to malfunction and starve the bike of fuel. I have the opposite problem,. LOL
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'98 Bimota SB6R #000016 "Sweet 16"
Built 5/97
2014 Suzuki Hayabusa
2001 BMW R1100S
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oily
Joined: 05 Apr 2008
Posts: 4788
Location: worcestershire
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| Posted: Wed Jul 17, 2013 7:51 am Post subject: |
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...Dump the pump..... 
Gravity is your friend....
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bimota_rider
Joined: 06 Jul 2013
Posts: 213
Location: Utah, USA
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| Posted: Wed Jul 17, 2013 1:55 pm Post subject: |
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Okay, that sounds like good advise. I think gravity bypasses the pump anyway. I'll double check that.
Regardless, are you saying that if I simply plum the carbs to run off of a pure gravity feed, the carbs will get enough fuel and NO fuel pump at all is necessary?
Seeing as how the fuel supply is cut off when the key is turned off, via a solenoid at the petcock, I have always have pondered why "gravity feed" wouldn't be an adequate choice anyway. THANKS for the advise! 
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'98 Bimota SB6R #000016 "Sweet 16"
Built 5/97
2014 Suzuki Hayabusa
2001 BMW R1100S
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Evilchicken0
Joined: 12 May 2010
Posts: 2996
Location: London
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| Posted: Wed Jul 17, 2013 5:55 pm Post subject: |
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The SB6 uses a gravity feed but has a vacumn tap, so it only fuels when the engine is turning over. The 6 can be a bit fussy when it comes to fuel pipe routing though.
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bimota_rider
Joined: 06 Jul 2013
Posts: 213
Location: Utah, USA
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| Posted: Thu Jul 18, 2013 12:36 am Post subject: |
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 The 6R ain't no picnic either.....LOL
With the gravity feed strategy, I kind of worry about the feed keeping up with the demand under WFO conditions (Wide F*ckin' Open  )
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'98 Bimota SB6R #000016 "Sweet 16"
Built 5/97
2014 Suzuki Hayabusa
2001 BMW R1100S
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CBar
Joined: 05 Jan 2010
Posts: 142
Location: Texas
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| Posted: Fri Jul 19, 2013 1:01 am Post subject: |
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| Don't worry too much about it until there is a problem, which i doubt you will have. |
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bimota_rider
Joined: 06 Jul 2013
Posts: 213
Location: Utah, USA
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| Posted: Fri Jul 19, 2013 3:30 am Post subject: |
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CBar said;
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| Don't worry too much about it until there is a problem, which i doubt you will have. |
You know, I looked up "problem" in an old Latin dictionary and it said:....... "Bimota SB6R"
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'98 Bimota SB6R #000016 "Sweet 16"
Built 5/97
2014 Suzuki Hayabusa
2001 BMW R1100S
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brian
Joined: 22 Aug 2011
Posts: 3770
Location: Australia
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| Posted: Sun Nov 24, 2013 8:22 am Post subject: |
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How did you get on with this issue mate??
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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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bimota_rider
Joined: 06 Jul 2013
Posts: 213
Location: Utah, USA
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| Posted: Sat Dec 14, 2013 6:44 pm Post subject: |
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Brian, I am so sorry I missed your post!
In a nutshell....
The US spec gsxr 1100 uses a Mukuni 38mm setup. Canada's gixxer 11s use a 40mm set up.
I found a dealer in Canada to work with and they FINALLY sent me the correct floats for my engine.
It turns out the floats have been super-ceded and I ended up with the exact float/needle/seat kits that I received from the very first supplier that also fit the 38mm Mikunis.....
SO, in not so many words I wasted a TON of time and some serious money, solving an unsolvable problem.......
I installed the new float/needle/seat kits and they continued to flood.
SO, I bent the tabs and messed and messed with the float heights and finally got the right combination.
MY BIKE NOW RUNS LIKE A RAPED APE and all is well in my confusing little world...LOL
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'98 Bimota SB6R #000016 "Sweet 16"
Built 5/97
2014 Suzuki Hayabusa
2001 BMW R1100S
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Evilchicken0
Joined: 12 May 2010
Posts: 2996
Location: London
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| Posted: Sat Dec 14, 2013 11:59 pm Post subject: |
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38s are supposed to give a better midrange than the 40s
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