Clutch plate movement. Food for thought and discussion?
Feb 25, 2021 10:55:30 GMT 1
midlifecrisisrd, JonW, and 2 more like this
Post by Tobyjugs on Feb 25, 2021 10:55:30 GMT 1
A few weeks ago the clutch cable on Kees's RD broke in the centre of Rotterdam. It was a bit of a faff riding it out or Rotterdam because of traffic and lights, but was plain sailing once on the motorway.
Being a bit lazy i couldn't be bothered removing the cable because of the little bracket holding the cable to the top of the YPVS engine casing. I made the inner cable in place and it was a little long and the adjuster had to be screwed out in the clutch perch.
I told my self not to be so lazy and opened up the side casing to adjust the pressure plate. Out of curiosity i decided to measure the pressure plate travel.
The arrows on the block and clutch actuator were not lined up due to the cable being too long and with the cable adjuster on the perch taking up the slack the movement on the clutch plate was 0.41 mm movement. I then screwed the cable adjuster on the perch right in and adjusted the pressure plate to take up the slack. The arrows on the clutch actuator and block were still in the same position and the movement on the pressure plate was the same.
After shortening the clutch cable and playing around with the perch and pressure plate adjustments the maximum movement i measured was 0.75mm at the pressure plate.
This was a bit of a surprise after measuring 1.70 mm of movement on the Bakker engine.
The difference between the two is the clutch perch. The standard 4LO lever produces a lot less movement compared to the Brembo clutch perch.
This shows how important it is that the clutch cable really needs to be the correct length and adjusted correctly.
The thread above does make my opinion stronger about selecting neutral.
If you want a supple neutral selection use a clutch perch with a longer pull and make sure it is adjusted correctly, then you don't need any other mods just the normal Yamaha parts.
Being a bit lazy i couldn't be bothered removing the cable because of the little bracket holding the cable to the top of the YPVS engine casing. I made the inner cable in place and it was a little long and the adjuster had to be screwed out in the clutch perch.
I told my self not to be so lazy and opened up the side casing to adjust the pressure plate. Out of curiosity i decided to measure the pressure plate travel.
The arrows on the block and clutch actuator were not lined up due to the cable being too long and with the cable adjuster on the perch taking up the slack the movement on the clutch plate was 0.41 mm movement. I then screwed the cable adjuster on the perch right in and adjusted the pressure plate to take up the slack. The arrows on the clutch actuator and block were still in the same position and the movement on the pressure plate was the same.
After shortening the clutch cable and playing around with the perch and pressure plate adjustments the maximum movement i measured was 0.75mm at the pressure plate.
This was a bit of a surprise after measuring 1.70 mm of movement on the Bakker engine.
The difference between the two is the clutch perch. The standard 4LO lever produces a lot less movement compared to the Brembo clutch perch.
This shows how important it is that the clutch cable really needs to be the correct length and adjusted correctly.
The thread above does make my opinion stronger about selecting neutral.
If you want a supple neutral selection use a clutch perch with a longer pull and make sure it is adjusted correctly, then you don't need any other mods just the normal Yamaha parts.
