Mikuni BST40 slides

Left: '96-'14 Suzuki DR650 with one 2.5 mm (0.0984")(4.91 mm²/0.0076 in²) slide lift hole. Right: '98-'07 KTM 640 LC4 with two 2.5 mm (0.0984")(4.91 mm²/0.0076 in²) slide lift holes. Increased slide lift hole area contributes to accelerated slide, slide guide, emulsion tube, and jet needle wear.

new and used LC4

new, engine side view

used, engine side view

slide guide, new

slide guide, used

emulsion tubes, new and used

jet needles, new and used

BST40 slides can be purchased here.

Applications list:

Aprilia Moto 6.5 '95-'02 (left)
KTM 400 LC4-E '01 (right)
KTM 400 LS-E/mil '04-'05 (right)
KTM 400SXC '00 (right)
KTM 625SXC '03 (USA only)(right)
KTM 640 Duke II '00-'07 (right)
KTM 640LC4 '98-'99 & '02 (right)
KTM 640LC4 Adventure R '99-'07 (right)
KTM 640LC4-E '00-'01 (right)
KTM 640LC4-E/mil '98 (right)
KTM 640LC4 Enduro '03-'05 (right)
KTM 640LC4 Supermoto '01-'05 (right)
KTM 640LS-E/mil '00 (right)
Suzuki DR650 '96-'14 (left)