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OFNA/Picco Roto-Start Conversion
1) Obtain HPI's #87117 Roto-Start back plate unit for the S-25 engine
2) Get a 12mm plastic hex hub from 1/10-scale car or truck and trim it to a thickness of 6mm (HPI MT2 hexes work well)
3) Assemble the back plate unit according to the instructions that came with the unit
4) Slide the trimmed 12mm plastic hex into the hex hole of the main gear in the back plate unit (the depth of the hex hole is 11mm and the hex head of the Picco's starting shaft is 5mm thick; we'll use the spacer made at step 2 to make up the difference)
5) Remove the pull start unit from the engine
6) Mount the HPI Roto-Start backplate unit, with the spacer installed, onto the Picco engine, and that's it!
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Copyright © 2007 Bruce Johnson