Join Date: Nov 2014
Location: Beaverton, Oregon, United States
Update/upgrade your starter circuit and electrical system grounds to higher quality components. Clean all your grounds and verify metal/metal contact.
Replace your regulator/rectifier with a MOSFET type unit.
Check the health of your battery, keep it on a tender when not in use, consider replacing it if you don't know it's provenance.
Get fresh modern tires on your wheels and sintered/HH brake pads for your stainless rotors.
Replace the rubber brake and clutch lines with stainelss or kevlar.
Lubricate your tach/speedo cable and check the lube/grease in your speedo sender.
If you are doing gearing, update the chain to a modern O- or X- ring chain.
Whenever you are working on a component, do not leave it on the bike. Take it off and clean it to like-new; take that time to inspect it closely for the potential need to replace or repair it. Cleanliness makes it easy to spot potential issues, leaks, blow-by, etc in the future.
The ignition on these bikes is actually pretty solid. If you have a bright strong blue spark at the plug, assume it could be a fueling issue instead.
1994 900 SS/CR
2017 939 Supersport S
It's Italian. If I can get it to start, it'll win.