Bonneville America Forums Forums Technical Forums Performance Mods What big bore for an 865?

Opening up the lower case to accept the bigger barrels.
I learned that our barrels actually slip into the top case. Theres a couple inches of sleeve that extend down past the casing. With a bigger bore there needs to be clearance but it does not seem to be as simple as just opening the hole. Looks like there is a lip to machine as well.
Ill know more this winter and cant find the thread with pictures (on another forum - triumph rat.net).