1987 Derbi DS50
I added a Mertakit 70cc big bore kit w/16mm Dellorto/with intake plus a Metrakit exhaust. I lightened up the variator so the constant RPM is higher for the hills. The first time I opened it up on the flats I actually lifted up my legs because I didn't think any engine could turn over that fast and hold together! I have no idea how fast it was going because the speedo doesn't work!
- Uploaded by Bob Smiley on April 15, 2008
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