these should have Keihin semi downdraft carbs....#38 standard pilot jets are measured .38mm or .0149606"
Keihin mains are measured same...a 160 is 1.60mm or .0629921"
Yes, the main should have its hole looking straight into it, as it is mounted in the emulsion tube. See the pic...though a different carb, the metering hole in main clearly visible dead center in the end ....and should be in all 4 of yours, too.
But your idle issue pertains to the idle circuit, not the main (but check anyway) ....did you remove and check the pilot screws? How many turns out?
'95 Ducati 900SS/SP
'07 Ducati SS800
'98 Honda VFR800 FI
Last edited by bigbadbass; 01-01-2019 at 03:42 PM.