Bimota Forum

[Hursty]

As Vince suggested here are some carb settings in one place please add your own if you know them,

Mine are after hours on a dyno and its running real smooth now.

Mako has
I bought new main jets from Wemoto:
the inner ones are 137.5
the outer are 135

pilot jets 40
pilot screw: 2 turns out
float height set as manual (14,7mm if I remember)
needle set at second pitch from top (first setting was on third from top)

Vince has
Mine size of main jet is 122 all 4 of them.
Pilot jet 40
Pilot screw 1-5/8 turns out

Hursty has

Main jet 130 all
needle clip 3
float height 12.5mm
F.screw 2.75
Standard pilot jet

running 98 gas with air box mod and ignition advance
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Hursty from kiwi land

[brian]

Wow, huge difference between those three.
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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

[Vince186]

It’s indeed a big difference between the same types of bikes.

How is that possible.
Did previous owners do the changes to the carbs.
Did Bimota put in what they had in stock.
Is it frame number related.

Does someone have an idea or the knowledge about this

If you have the settings about your carbs please feel free to put it in this topic.
It is for the knowledge of science.
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vince
A person who never made a mistake never tried anything new. Albert Einstein

[Evilchicken0]

Just make sure there's a note between standard and dynojet
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Don't read everything you believe

[husson73]

on the air filter modification kit for SB6 1995 done by Bimota Factory there 3 jets 125 and one 127.5 for the carbs

[Niels]

Interesting info but also depending where (what climate) you live. What is used stock?

[Jonny B Bad]

Interesting that a 6R, with the same motor but better breathing, runs well with 155 mains with a better filter and straight through pipes!
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What, Jonny's gone!

[brian]

I've pulled my carbs out to clean and check them as i have a bit of a dead spot at around 3k - 4k.

Big diference to the others listed here as my mains are all 120's. Pilots are the same at 40.

How do i measure the float height???
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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

[Evilchicken0]

There are 2 ways to measure float height.

1 take the carbs off, take the float bowls off invert the carbs and measure from the carb body
2 Carbs on the engine, put a clear pipe on the bleed screw outlet and open the bleed screw. Hold the tube up to the carb body and you'll see the fuel height. You need to open the fuel valve in the tap, I use a big pipet to get some suction where the vacuum pipe joins.

First method is the easiest.
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Don't read everything you believe

[brian]

[Evilchicken0]

Never actually done it on the Bim, I've always given it to the Dyno man (Race Engineering)

Have a look in the manual - suzuki one will do
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Don't read everything you believe

[Hursty]

Hi Brian
Its was a big job even with a dyno and an expert,
Good luck
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Hursty from kiwi land

[Vince186]

Brian,

You can do it your self; you only have to be patient.
I did it in 1 1/4 year.

I did a lot of changes and testing before I had the perfect SB6.
I will make a short description of what I did. (When I have a little more time)

Method 2 is the best as EC described, only not possible on the SB6. There is no clearance to reach the carbs properly.

Method 1 is what remains.



“Tip” work very accurately…
On mine carbs it was too high 15,2 mm I adjusted it to 14,7 mm.
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vince
A person who never made a mistake never tried anything new. Albert Einstein

[brian]

Thanks Vince. The plastic assembly that holds the float is held in place by the float bowl. I'm guessing that i need to hold it down tight with mt finger to get an acurate measurement... yes?

I'm very curious as to why mine have 120 main jets in all carbs and most others are a fair bit bigger?

Also curious why the manual lists 125's for 3 # 1,2 & 4 and 127.5 for # 3?
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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

[Evilchicken0]

No you don't hold it the plastic assembly is in there well enough. The float isheld to it by a metal pin which fits tightly into the assembly but the float is free to ... er ... float.
Just measure your float height to begin with and compare them accross the 4 carbs. you only need to change things if your bike isn't running right, if you go in there and alter a setting you can chase the setting all over and usually arrive back where you started.
Jet sizes are paired to the needle and the needles are dependent on their height.
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Don't read everything you believe