Just think of how many guys have 4mm stock cyl set ups or even servals that they're trying to run on stock carbs. Now you can take them to 28mm and get by with these.
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Depends on the rest of the set up. If the bike has enough compression and timing to have some low/mid performance and the bike is geared to help the shearers get in to the revs they are fine. But the CPI's would have a little more torque for easier on/off the throttle recovery.
Yes. Once the retainer is off the clutch arm can go up or down. But you also should have the clutch cover off and pressure plate loose. So the rod and ball can move forward while you drop the new arm down in.
There will be a thin metal washer/shim over the seal. Pluck the seal and you will see the needle bearing. You can usually use a screwdriver or small punch to implode it a little and pull it up and out. COUNT THE AMOUNT OF NEEDLES IN THE BEARING AND AFTER YOU PULL IT OUT. They tend to fall apart and can easily be retrieved with a magnet.
If your arm bent up you may also need a new cable. Also don't forget to adjust the adjuster on the pressure plate.
There is a seal, change that while you're in there. The clutch arm will just drop down in there. The retainer on top holds it in. (Why is there no retainer in the photo?)You should also do the clutch rod and ball. No splitting of the cases needed.
Stupid question, but who is currently balancing a banshee rotating assembly? Would like to have a TDR 10mm done with some 73mm pistons before I assemble it.