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PostPosted: Sat Jul 30, 2011 6:09 am 
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Joined: Thu Apr 21, 2011 5:32 am
Posts: 403
Location: North Carolina
Country: USA
Bikes owned: 1974 GT750 B-4 (JDM), 1975 GT750M
Hi all,
Couple of quick questions for the BS40 experts:
1. Pilot screw adjustment: Suzuki shop manual states 1/4 turn out for Pilot Screw. Haynes says 3/4 turns. Which is correct?
2. Float Bowl Gasket: I am not sure that I have the gasket in the right way around in my pic below. The shop manual says to have the extra hole "opposite" the starter pipe. Not sure whether I have interpreted "opposite" correctly.
As always, your advice & counsel greatly appreciated!


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Proud parent of Triplets & Twins:
1975 Suzuki GT750 M
1977 Yamaha RD400D
1988 Yamaha FZR400U (Track Bike)
1998 Triumph Thunderbird Sport
2009 Kawasaki Ninja 650R


Last edited by RING_DING on Sat Jul 30, 2011 2:50 pm, edited 1 time in total.
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PostPosted: Sat Jul 30, 2011 10:43 am 
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Joined: Mon Nov 03, 2008 10:47 am
Posts: 4807
Location: Illinois
That's not too hard to answer. Bikes with #47.5 pilot jets used 1/4 turn (L) and those with #45 (MAB) set the fuel screw at 3/4 turn out.

The gasket is not so obvious, but the hole aligns with a cutout in the float bowl.What exactly it is there for is not clear. The extra hole doesn't line up with the air drilling to the pilot jet for example, so why it's there is not clear, but it goes the other way round. That brass tube in teh upper right of your picture is the starter fuel feed and the whole should be the other side of the needle jet to that.


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PostPosted: Sat Jul 30, 2011 2:49 pm 
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To the on ramp
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Joined: Thu Apr 21, 2011 5:32 am
Posts: 403
Location: North Carolina
Country: USA
Bikes owned: 1974 GT750 B-4 (JDM), 1975 GT750M
Thanks TZ! Carbs are back on, and she is idling away nicely.

_________________
Proud parent of Triplets & Twins:
1975 Suzuki GT750 M
1977 Yamaha RD400D
1988 Yamaha FZR400U (Track Bike)
1998 Triumph Thunderbird Sport
2009 Kawasaki Ninja 650R


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