Mikuni BST40 slide guide

New. Notice the ~0.020" (0.51 mm) deep depressions in the bottom corners/concentric to the bore (circled in green), as well as the four circular ~0.023" (.58 mm) depressions.

end view

with unknown miles

slide, new

slide, used

emulsion tubes, new and used

jet needles, new and used

BST40 slide guides can be purchased here.

Applications list:

Aprilia Moto 6.5 '95-'02
Cagiva Canyon 600 '96-'97
Cagiva Canyon 500 '97-'07
Husqvarna SM610S '03-'04
KTM 400 LC4-E '01
KTM 400 LS-E/mil '04-'05
KTM 400SXC '00
KTM 625 SXC '03 (USA only)
KTM 640 Duke II '00-'07
KTM 640LC4 '98-'99 & '02
KTM 640LC4 Adventure R '99-'07
KTM 640LC4-E '00-'01
KTM 640LC4-E/mil '98
KTM 640LC4 Enduro '03-'05
KTM 640LC4 Supermoto '01-'05
KTM 640LS-E/mil '00
Suzuki SG350 Goose '91-'99
Suzuki DR650 '90-'16
Suzuki GSX-R750RK '89
Suzuki GSX-R1100 '91-'98 (non-USA)