Looking to replace the clutch master on my 999 with a new radial one. It's my understanding the oem 9990has a 15mm piston. If I got a radial with a 16mm can I assume things will function properly?? Thanks.
If it's anything like brakes...larger piston, more volume pushed, less lever has to move...less effort....going up 1mm I would surmise as negligible...I went from a 16 to a 19 on the brakes...lever pull is appreciably lighterLooking to replace the clutch master on my 999 with a new radial one. It's my understanding the oem 9990has a 15mm piston. If I got a radial with a 16mm can I assume things will function properly?? Thanks.
Pretty certain that the smaller the diameter the smaller the volume...smaller diameter pistons use a deeper cylinder to make up for the loss equating to a longer throw...in turn more modulationYou got it the wrong way around. Smaller master piston, more fluid moved. All things being equal. Lever ratio: the closer the piston is to the pivot point the more power produced and the more the lever.
I suppose that is the real question...if the radial is made for your bike than someone has already done the math...if not calculate the volume of the new master and compare it to the old ...if it's off by a large margin...you can be in for trouble...other than that it will engage a wee bit sooner than your use to with a wee bit less effort...just move the lever to suitSo will the lever pressure be about the same and disengage the clutch properly?
That is some real world answers right there...and before someone says to turn the adjustment knob to bring out the lever....that is the effect of a smaller pivot distance .ie x18 on the brake master...a x20 would have less travel and give the clearance needed while maintaining the same amount of reach...I come across the same issue with mine (19RCS)...the same will hold true to the clutch but sounds like that isn't an option... nonetheless I don't believe anyone has their bite point that close to the grip so it's not really an issuegreat help.I have a 16 brembo radial clutch & stock slave-999s.works very well however the last 1/4" of pull hits the switch.front brake lever also hit the throttle unless its revolved 180* & the cables rerouted.super ez to bleed with the lever bleeder as well.
This is incorrect.If it's anything like brakes...larger piston, more volume pushed, less lever has to move...less effort....
No. Smaller piston = less fluid displaced when moved the same distance as a larger piston. However, the smaller piston requires less effort by the human hand to move the slave piston a given distance.You got it the wrong way around. Smaller master piston, more fluid moved. All things being equal.
Rex Coil & and John are correct in all respects. I just bought a 998 and I hated the masters - the brake I could lock up almost with one finger and grabby, and the clutch was like a race clutch, taking about 1mm to engage and making me twitch the back end out sometimes.I converted to Brembo 16x18 on the clutch side and 19x18 on the brake side with Rizoma reservoirs. By moving the lever assembly around and pressure switch, the fit was excellent, no issues. I did this maybe five or six years ago and now I forgot how the stock set up differed, whether harder or softer. All I know I was happy with the conversion in all respects.