clutch master cylinder bore diameter

[googooatlarge]

I am putting together a F1000 type of car and I will be using a 2008 Honda CBR 1000RR motor. I was wondering what clutch master cylinder bore I should be using for this engine. I was reading somewhere that 5/8" is typically used for these 1000cc engines. Any help is appreciated, thanks

[zexel]

Isn't 5/8" the smallest standard master cylinder? For my Busa, 5/8" is way too big. I had to shorten the clutch pedal ratio to 67% and it still wasn't great.

[teamwisconsin]

AP makes both 14mm and 15mm masters (.551" and .590" respectively) if a .625" master is still too large.

[RobLav]

Use a cable. It's light, cheap, less plumbing, and effective. Locate the fulcrum point between 1/4 and 1/3 of the way up the pedal from the bottom.

[KodaBear]

I have a Honda RC51 engine in my FB, honda probably used the same or similar slave cyl in the Cbr. I am using a 3/4 bore master for the clutch and it works fine.

I don't see how you could use a cable if the clutch actuation is anything like it is on the RC as there is no clutch arm.