My'91 Zephyr 750 used to do this too when the engine was cold - never got around to working out what the issue was - guess maybe some wear in the starter clutch - sounded a bit like a squawking dog noise. Z1-R clutch was doing the clanging/rattling until I replaced the rollers/pins and springs. No wear evident on the starter clutch rollers or pins or the starter gear boss but the springs were 25% compressed compared to the new ones and quite weak - so guess that this was the source of the rattling/clanging?
Current Project
1968 Norton P11A Desert Sled
Other bike (and daily ride)
2004 Yamaha FZR 600
Previous Bikes
78 Z1-R (resto)
91 Zephyr 750
73 Mach IV (Resto)
78 Z1-R
78 Z1-R (stolen)
76 Z900
76 Z650
73 Mach IV
72 Mach III
