So after a recent power increase to the motor i wanted to ensure the rest of the drive would work in a reliable fashion. so the clutch setup was modified.
Initially i installed the clutch off a banshee SHO to handle the power (the banshees are rated at 10.5hp which is much more then the cags put out). The bonus being they are adjustable so the engagement rpm can be set much higher then the standard cag clutches which effectively provides more off the line power.
The next part in the drivetrain is the clutch bell and housing. this transfers the drive from the clutch itself to the sprocket / rear wheel. the standard chinese items are fairly terrible in regard to they cant dissappate much heat and the stock bell is horribly out of round + made from very thin material.
To begin with i modified the stock housing by milling out some superfluous material around the edges and also milled out large sections from the centers to help the bell ventilate heat better. the inside has cast ridges so its still more then strong enough.
Stock housing is on the right and the modified one is in the center. Polini replica housing is on the left. The polini replica was upgraded to a different setup so i used most of the internals from it in this build.
You can also see the bell is slightly wider so it covers the entire clutch itself. which the stock one didnt do..
Next i needed to change the polini replica clutch bell - which is much better made with thicker material and substantialy more concentric :) To do this required a new bearing that has the same outside diameter but a slightly larger inside diameter. Removing the large circlip allows the bearing to be pushed out and replaced.
Because the polini replica clutch bell is a little bit larger in outside diameter then the old one (you can see the difference in the above pics) .5mm is required to be machined off. i did this on the lathe. while i was at it i also trued up the face. the rest was okay.
With the bell nicely trued clutch wear will be massively reduced. Thats good considering the rarity of the banshee clutches!
The center bore was also retapped to m8 x 1.25 to accept standard BZM sprockets. The chinese ones are notoriously crap.
A spacer was needed to space the bell away from the housing itself (i stole one from my old zocchi housing that didnt use it) and a section was milled off the front of the housing to stop the chain rubbing. Also seen in the picture is the custom roller i made so the chain will clear the swingarm, it used to rub horribly.
All done and ready to go! This setup should handle any level of power i build the motor to. and all with old parts i had laying around
No comments:
Post a Comment