PARILLA CLUTCH CONVERSION
Jim Avery has been working on this project for quite some time. He has managed to finally work out the small problems associated with such a conversion. The original Parilla clutch is a combination of increasingly hard to obtain parts. The solution Jim has trying to work out is grafting a reliable Yamaha clutch to the Parilla innards. This has all been done to keep Parillas on the road and improve reliability. Here is the rundown on the project:
1. - Original Parilla main shaft with no modifications.
2. - This is the inner clutch plate and race for the clutch basket and gear. The plate was machined out.
3. - Original Parilla needle bearings with no modifications.
4. - The clutch hub and gear. Ears have been machined off and holes drilled for mounting the Yamaha clutch basket.
5. - The Yamaha clutch basket with ears removed off the back and the center machine out.
6. - Hardened, tapered flat head 5mm allen bolts with nylocks. Used for mounting the basket to the gear.
7. - The inner Yamaha clutch hub with a new matching spline machined in by EDM.
8. - Spacer and left handed nut for attaching the hub to the shaft. This was made from scratch.
9. - The Yamaha clutch plates with no modifications.
10. - The Yamaha clutch outer. The inner part machined out and drilled to mount the new adapter spacer (#12).
11. - The original Yamaha clutch springs and bolts.
12. - The adapter spacer for clutch rod to push against. The shaft stuck out too far for the original to work. This was made from scratch.
13. - The Yamaha clutch shaft, rod with adjuster and push plate. No modification.
14. - Allen bolts and nuts to mount adapter plate (#12) to the Yamaha outer plate (#10).
A couple of minor changes were made since the above picture was taken. Part #12 was remade because it was hitting the outside cover when the clutch was disengaged. The new one is slightly thinner and a thrust washer is been used between parts #5 and #7.
Here is the finished product with a twin plug modification.