Hi, Evryone,
In response to a few recent posts on this forum, here is a list of the thread sizes used on Bridgestone frame and engine parts, and used by Mikuni on their early VM series of carbs (as fitted to all BS models)
Note that these threads are all to the old (pre-ISO) standard, and the pitches on the smaller sizes are different to current threads
BRIDGESTONE FRAME AND ENGINE PARTS
------------------------------------------------
M2:- 2.0 * 0.4
M3:- 3.0 * 0.6 (ISO threads are 0.5 pitch)
M4:- 4.0 * 0.75 (ISO threads are 0.7 pitch)
M5:- 5.0 * 0.9 (ISO threads are 0.8 pitch)
M6:- 6.0 * 1.0
M8:- 8.0 * 1.25
M10 Fine:- 10.0 * 1.25
M10 Coarse:- 10.0 * 1.5
M12 Fine:- 12.0 * 1.25
M12 Coarse:- 12.0 * 1.5
SPEEDO AND TACHO CABLES
---------------------------------
Meter end:- 12 * 1.0
Wheel end:- 11 * 1.0 (also used on the 350GTR tacho cable engine end)
MIKUNI CARBURETTORS
---------------------------
(Note that these are all finer pitch than used elsewhere on the bike, and in the case of Main and Pilot jets they are different from those used on current carbs)
Main Jet:- 5.3 * 0.9
Pilot Jet:- 5.0 * 0.75
Needle Jet:-6.0 * 0.75
Pilot Air Screw:- 6.0 * 0.75
Throttle Stop Screw:- 6.0 * 0.75
Cable Adjusters:- 6.0 * 0.75
Choke Cap:- 10.0 * 1.0 (On all models except late model BS350)
11.0 * 1.0 (late model BS350)
Float Valve:- 7.0 * 0.75 (on all models except BS350)
8.0 * 0.75 (early model BS350)
9.0 * 1.0 (late model BS350)
