clivegto Posted August 16, 2018 Share Posted August 16, 2018 (edited) What's the best main jet size, needle hight & mixture screw turns out to set some bst 40 mm carbs with pod filters on a 1100m motor. No room for a air box as it is fitted to a 1100 slabside. Edited August 16, 2018 by clivegto Quote Link to comment
Gixer1460 Posted August 17, 2018 Share Posted August 17, 2018 Good luck - they are a PITA to set up! Quote Link to comment
clivegto Posted August 17, 2018 Author Share Posted August 17, 2018 1 hour ago, Gixer1460 said: Good luck - they are a PITA to set up! Yes I have read that they are hard to set up. Was just after some basic settings really. 1 Quote Link to comment
Oilyspanner Posted August 18, 2018 Share Posted August 18, 2018 I tried a set-up a bit like that Clive - I think I used 155 mj, needles on bottom notch and 42.5 pilots - should be close enough to work with anyway. Those don't look like 1100 m/n 40mm carbs - are yours from a 750 rk ? 40 mm cv carbs can be/are mo fos to set-up...… I always see it as a personal challenge to make them work ! - they work better on my big bore and flowed motor, I kept the a.box as the power was much smoother with it in place. 1 Quote Link to comment
Gixer1460 Posted August 18, 2018 Share Posted August 18, 2018 3 hours ago, Oilyspanner said: they work better on big bore and flowed motor, I kept the a.box as the power was much smoother with it in place. That's the secret - they don't respond well to disrupted air flow - open, ram pipes, small filters etc. 1 Quote Link to comment
manden Posted August 18, 2018 Share Posted August 18, 2018 8 hours ago, Oilyspanner said: I tried a set-up a bit like that Clive - I think I used 155 mj, needles on bottom notch and 42.5 pilots - should be close enough to work with anyway. Those don't look like 1100 m/n 40mm carbs - are yours from a 750 rk ? 40 mm cv carbs can be/are mo fos to set-up...… I always see it as a personal challenge to make them work ! - they work better on my big bore and flowed motor, I kept the a.box as the power was much smoother with it in place. I think my rack had 42,5 pilots and 160 mains. Tapered needles 1 from bottom 1 Quote Link to comment
clivegto Posted August 19, 2018 Author Share Posted August 19, 2018 @Oilyspannerthe carbs were on the bike when I got them so don't know if they are RK ones. Bst40mm on right side the others are some bst38mm ones I have, they doo fit the same carb rubbers. Quote Link to comment
Oilyspanner Posted August 19, 2018 Share Posted August 19, 2018 The 1100 m/n ones have a cable choke, remote idle speed like your 38's and the top carb spacer bracket is flat - just checked 750RK carbs on csmnl site, the rk carbs have odd diaphragm covers/ carb tops ……. dunno, just something I noticed about your 40's. Quote Link to comment
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