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FCR Carbs or similar

 
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Spongebob



Joined: 03 May 2016
Posts: 144
Location: Oxfordshire

PostPosted: Sat May 25, 2019 12:15 pm    Post subject: FCR Carbs or similar Reply with quote

anyone run their SB6 or SB6R on FCR41 carbs or similar as oppose to stock? Good route to go or not?
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Gammaboy



Joined: 25 Feb 2016
Posts: 188
Location: Brisbane, Australia

PostPosted: Sun May 26, 2019 3:43 am    Post subject: Reply with quote

You have to cut clearance pockets in the frame cross member for the FCR float bowls. Mikuni TMRs are an option, but need wedge shaped spacers under the carb rubbers to angle them up for more clearance.
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O_Roger



Joined: 20 Mar 2014
Posts: 43
Location: Germany

PostPosted: Sun May 26, 2019 8:33 am    Post subject: Reply with quote

I do, check my thread:

http://www.bimotaforum.co.uk/viewtopic.php?t=5658

I find they give the bike a very racy feeling and am very happy to have them but, you need a second fule accelorator pump (loosely translate from the German name Kraftstoffbeschleunigerpumpe) and the frame needs a few cuts and welding. The amount of work required is not much but if you have to go to a specialist its going to be to expensive. The priviouse owner of my bike payed 3000€ to have the carbs installed (with second pump and addjusting) i payed 3000€ for a general maintainance job of wich the main part was carb cleaning and re addjusting ( got ripped of).
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Spongebob



Joined: 03 May 2016
Posts: 144
Location: Oxfordshire

PostPosted: Sun May 26, 2019 11:10 am    Post subject: Reply with quote

Thank you both. Frame modification scares me and the only person I know that would take that kind of job on is highly likely to be hanging up his welding torch due to ill health. I was hoping for a straight swap.

Reason for thinking this route is my bike has a very pronounced flat spot between 3 and 5 thousand revs. A dyno session has helped and it does improve when the motor is really hot but it’s really noticeable especially on track days coming out of slower corners. My dyno guy suggested carbs and airbox most likely to blame
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Gammaboy



Joined: 25 Feb 2016
Posts: 188
Location: Brisbane, Australia

PostPosted: Sun May 26, 2019 10:21 pm    Post subject: Reply with quote

It's probably the standard issue with these carbs of the needle wearing the emulsion tubes, there's a step in the bottom of the slide that makes the needle sit at an angle. Stepped carb washers (to make the needle sit straight) are the answer, with new emulsion tubes.
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