Street Cup Fork Drain Bolt

Sorry i can´t help with exact thread diameter and pitch and length of bolt, loosened them when i put in YSS emulators. They have tight pitch and a lot of Locktite so i would not loosen unnessarely for changing oil or so. Better to use a cheap vacuum pump to suck the oil from above. If you need to open them you need a long quality hex and an air gun, my 18 volt DeWalt battery machine could not rattle them loose.

 

Give it a few weeks @RevPaul and I'll tell you when I strip mine.

 

No, i drilled the holes in the OEM tube (called piston by Triumph). That has to be done for the emulator to function as intended.
So now you have to loosen them so take off the wheel and loosen the lower bolt before opening the upper fork cap, the spring helps to avoid the the piston turns instead of unthreading, as i wrote i had to use an airgun to loosen the bolt. Same when assembling everything back, just get the bolt to start to thread in the piston, put emulator, spring, washer, spacer and cap back together (without oil). Tighten the lower bolt, remove upper cap, fill oil and cap back.