Mikuni BN/SBN Rebuild info

This page is under construction, There will gradually be more and more information about these Mikuni Carbs

Spring ▶
Needle
🔽
115 Gram
(Shiny Silver)
95 Gram
(Dull Silver)
80 Gram
(Black)
65 Gram
(Gold)
1.555PSI43PSI38PSI32PSI
2.032PSI25PSI21PSI18PSI
2.322PSI20PSI17PSI15PSI
2.519PSI17PSI14PSI12PSI

Yamaha Baseline carb settings:

Engine SizePopoffLow Adjustment screwHigh Adjustment screw
500ccN/A1 1/4 +/- 1/43/4 +/- 1/4
650cc25-35PSI1 1/8 +/- 1/41 1/8 +/- 1/4
SuperJet38-42PSI5/8 +/- 1/45/8 +/- 1/4 (Mag)
1 1/8 +/- 1/4 (PTO)
700cc30-40PSI5/8 +/- 1/45/8 +/- 1/4 (Mag)
1 1/8 +/- 1/4 (PTO)
760cc35-45PSI1 5/8 +/- 1/43/8 +/- 1/4
800cc45-55PSI1 7/8 +/- 1/4
(Both carbs)
1/2 +/- 1/4
1100cc45-55PSI1 1/8 +/- 1/4 (All carbs)7/8 +/- 1/4
1200cc38-42PSI1 1/4 +/- 1/4 (Mag, Center)
1 1/8 +/- 1/4 (PTO)
1/2 +/- 1/4 (Mag, PTO)
7/8 +/- 1/4 (Center)
1200R65-75PSI1 1/8 (All carbs)1 1/4 (MAG, Center)
1 1/2 (PTO)

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